halite
Enable an agent to recognise halite, assess a specimen or material lot, and judge its suitability for preservation, analysis, or a proposed use.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise halite, assess a specimen or material lot, and judge its suitability for preservation, analysis, or a proposed use.
Halite is the naturally occurring crystalline mineral form of sodium chloride (NaCl), a halide mineral with cubic symmetry commonly formed by evaporation of saline waters.
It can be Compare observed crystal features and analytical evidence to confirm or challenge a halite identification.; Select minimally damaging identification tests and record any material consumed or altered.; Assess impurity and associated-mineral evidence against a stated material specification.; Choose storage and handling conditions that reduce moisture-driven alteration and cleavage damage.; Trace a specimen or lot to its occurrence and distinguish observed provenance from inferred formation history.; Determine whether a proposed use requires further sampling, analysis, processing, or product qualification..
Distinguishing features
A mineral identification should establish a crystalline NaCl phase; sodium and chloride in a solution or mixed sample do not alone establish halite.
Halite has cubic symmetry and three perfect cleavage directions meeting at right angles; external cubic shape alone is insufficient because other minerals can also form cubes.
Approximate Mohs hardness of 2 and ready dissolution in water support identification alongside other evidence; testing must account for specimen damage.
Sylvite can resemble halite but is a potassium chloride mineral, so chemical or phase analysis should resolve uncertain identifications without tasting.
Colour does not determine halite identity or purity: colourless, white, or coloured material requires independent assessment of inclusions, impurities, and defects.
Scope
+ Mineral identity and evidence distinguishing halite from similar minerals and manufactured sodium chloride
+ Composition, impurities, inclusions, and halite abundance within a specimen or lot
+ Crystal structure, cleavage, hardness, texture, and identification measurements
+ Geological occurrence, formation evidence, and collection or extraction provenance
+ Dissolution, moisture response, mechanical condition, storage, and suitability for a stated use
- Sodium chloride as a chemical substance across all natural and manufactured forms
- Brine as an aqueous mixture, including dissolved sodium and chloride after halite dissolves
- Rock salt as a rock or bulk geological material containing halite and potentially other minerals
- Finished table salt, deicing formulations, and pharmaceutical or laboratory salt products
- Salt mines, extraction operations, evaporite formations, and salt-cavern infrastructure
Characteristics
- Record level
- mineral species | specimen | sampled material lot Separates properties of the mineral species from observations and decisions that apply only to a particular sample.
- Identification confidence
- unverified | provisionally identified | analytically supported; evidence and method recorded Prevents visual resemblance or a supplier label from being treated as conclusive mineral identification.
- Crystalline phase identity
- identified phases with analytical method and reference pattern Distinguishes halite from similar minerals and detects associated crystalline phases.
- Halite phase fraction
- mass % with method, uncertainty, and dry or as-received basis Distinguishes a predominantly halite sample from a mixed evaporite material.
- Chemical composition and impurities
- NaCl assay in mass %; individual constituents in mg/kg or mass %, with method and detection limits Supports purity assessment without confusing total chemical assay with mineral phase abundance.
- Crystal habit, cleavage, and aggregate texture
- observed habit, cleavage directions, grain relationships, and descriptive images Provides identification evidence and indicates susceptibility to fragmentation.
- Hardness
- Mohs scale; approximately 2 for halite, with test location and method Supports identification while exposing whether a tested grain or surface is representative.
- Inclusion and associated-mineral content
- fluid inclusions | solid inclusions | intergrown minerals | surface deposits; identified or unresolved Separates intrinsic mineral properties from features introduced by trapped fluids or other materials.
- Moisture and environmental exposure
- water content in mass %, temperature in °C, relative humidity in %, and exposure duration Helps interpret wetting, dissolution, recrystallisation, and caking under actual storage conditions.
- Physical condition
- intact | fractured | powdering | caked | visibly dissolving | recrystallised; multiple states allowed Determines whether handling, preservation, or resampling is needed.
- Geological and custody provenance
- links to locality, geological unit, occurrence, collection or extraction event, and custody records Supports natural-origin claims and interpretation of formation history.
- Proposed-use qualification
- unassessed | evidence incomplete | meets stated specification | fails stated specification Keeps mineral identification separate from suitability for a particular industrial, dietary, or analytical application.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.halite
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 30 questions.
Mineral identity Establishes whether the record concerns halite and what evidence supports that identification.
Halite can be confused with similar evaporite minerals, synthetic NaCl crystals, and mixed salt materials.
Identity boundaries
Separates the mineral species from substances, rocks, solutions, and products.
Halite record subject
Record whether the subject is the mineral species, a natural specimen, or a sampled lot, and distinguish mineral identity from commercial naming.
- Does this record describe halite as a species, a particular specimen, or a lot containing halite? definition
- What evidence distinguishes natural halite from manufactured sodium chloride or a product sold as rock salt? boundary
Diagnostic evidence
Combines physical observations with chemical or phase analysis.
Converging identification tests
Record the evidence needed to distinguish halite from sylvite and other lookalikes without treating colour or cubic habit as decisive.
- Which observed cleavage, hardness, optical, or diffraction results support identification as halite? measurement
- What additional test would resolve remaining confusion with sylvite or another associated mineral while avoiding tasting and unnecessary specimen damage? action
Composition and inclusions Describes the halite phase, chemical purity, and material accompanying it.
An NaCl-rich assay does not by itself describe phase abundance, trapped brine, insoluble residue, or use-relevant contaminants.
Phase and assay
Keeps mineral abundance and bulk chemical composition distinct.
Halite content and purity
Record halite phase fraction and chemical assay separately, including sampling basis and analytical uncertainty.
- What halite phase fraction and NaCl assay were measured, using which methods and moisture basis? measurement
- How was the sample selected to represent variation across the specimen or lot? provenance
Accompanying material
Distinguishes inclusions, intergrowths, coatings, and contamination.
Impurity location and origin
Record whether non-halite material occurs within crystals, between grains, or on exposed surfaces.
- Which fluid inclusions, solid inclusions, associated minerals, or insoluble residues are observed or measured? measurement
- Which constituents belong to the original specimen, and which may reflect processing, storage, or handling contamination? provenance
Crystal fabric and condition Connects halite crystal features and aggregate texture to current physical integrity.
Cleavage, grain boundaries, and recrystallisation affect both identification and what handling a specimen can tolerate.
Crystal and grain observations
Records morphology at crystal and aggregate scales.
Habit, cleavage, and texture
Distinguish growth faces from cleavage surfaces and describe crystal sizes and grain relationships.
- Are observed flat faces growth faces, cleavage surfaces, or unresolved, and what evidence supports the distinction? measurement
- What crystal sizes, intergrowths, and aggregate textures characterise the sampled material? measurement
Integrity and change
Records damage and alteration that affect preservation or interpretation.
Specimen condition history
Track fractures, powdering, caking, dissolution features, and new crystal growth against earlier observations.
- What evidence shows cleavage damage, dissolution, or recrystallisation, and when was it first observed? measurement
- What support, packaging, or handling changes are needed to prevent further loss of diagnostic surfaces or inclusions? action
Geological origin Records where halite came from and the evidence for its formation and subsequent history.
Locality labels alone cannot establish depositional conditions or distinguish original crystallisation from later dissolution and regrowth.
Occurrence and custody
Connects the material to a documented occurrence and acquisition history.
Traceable halite occurrence
Record locality precision, host material, collection position, and subsequent custody without inventing missing geological context.
- What locality, geological unit, host material, and collection or extraction position are documented? provenance
- Which links connect this specimen or lot to those records, and where does its custody history become uncertain? provenance
Formation and reworking
Separates observed geological evidence from interpretations of origin.
Crystallisation history
Record evidence for precipitation, burial-related change, deformation, dissolution, or later recrystallisation.
- Which textures, associated minerals, field relationships, or inclusion studies support the proposed formation setting? provenance
- What evidence distinguishes original halite growth from later deformation or dissolution and recrystallisation? boundary
Environment and use decisions Relates environmental response and measured quality to preservation and proposed applications.
Halite identification alone does not establish moisture stability, handling requirements, or fitness for a regulated product.
Water and storage response
Assesses dissolution and humidity-related change under specified conditions.
Moisture-driven change
Record actual exposure and sample response, accounting for associated salts and impurities rather than assigning every lot the behaviour of pure NaCl.
- At what temperature, relative humidity, liquid exposure, and duration does this material show wetting, dissolution, caking, or regrowth? measurement
- What storage conditions and monitoring interval follow from those observations and the preservation objective? action
Qualification and handling
Connects the sample to a stated use, applicable evidence requirements, and handling information.
Use-specific evidence
Record the applicable specification and material-specific safety information without transferring food, pharmaceutical, or industrial grade status from the mineral name.
- Which impurity limits, physical requirements, identity records, and jurisdiction-specific documents apply to the intended use? boundary
- What further analysis or qualification is required before this specimen or lot can be accepted for that use? action
- What handling controls are supported by the material's dust form, measured contaminants, and applicable safety documentation? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This is recalled knowledge, with no sources consulted.
- Color varieties are descriptive rather than separate mineral species; color alone does not reliably identify an impurity or origin.
- Verify product-specific purity requirements, applicable regulatory classifications and current standard editions; chemical identifiers and pure-substance constants do not fully characterize a natural deposit.
- Which of these check these first hold for the sense of halite this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Colorless or white halite
- Blue or purple halite
- Inclusion-colored pink or red halite
- Which of these kinds and varieties hold for the sense of halite this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Chemical formula - NaCl - Ideal composition; natural specimens can contain inclusions and impurities.
- CAS Registry Number - 7647-14-5 - Identifies sodium chloride as a substance, rather than halite as a mineral species or a particular natural salt mixture.
- PubChem CID - 5234 - Identifies sodium chloride.
- Which of these identifiers and schemes hold for the sense of halite this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- Codex Alimentarius Commission CXS 150-1985, Standard for Food Grade Salt, applies to qualifying salt products rather than establishing that any natural halite is food grade.
- Which of these standards and regulation hold for the sense of halite this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Source material for food salt after appropriate processing and quality control.
- Road deicing.
- Sodium chloride feedstock for chlor-alkali production.
- Preparation of brine for regenerating ion-exchange water softeners.
- Geological evidence for evaporative conditions in sedimentary environments.
- Which of these real-world use hold for the sense of halite this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Mohs hardness - About 2-2.5 - Mohs scale
- Density - About 2.16-2.17 near room temperature - g/cm³
- Melting point - About 801 for pure sodium chloride at atmospheric pressure - °C
- Solubility in water - About 36 at 20 °C, expressed relative to the mass of water - g NaCl per 100 g water
- Cleavage - Three perfect cleavage directions intersecting at 90° - crystallographic description
- Which of these typical measurements hold for the sense of halite this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Readily dissolves in water, causing loss of specimens or dissolution cavities in deposits.
- Brittle crystals split readily along cubic cleavage planes.
- Salt deposits deform by creep under sustained stress, affecting mines and underground cavities.
- Chloride-bearing brines promote corrosion of susceptible metals.
- Natural halite can contain impurities that make it unsuitable for food or other purity-sensitive uses.
- Which of these failure modes and hazards hold for the sense of halite this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Deposits occur in both ancient buried evaporite sequences and active saline lakes or coastal evaporative settings.
- Associated minerals, inclusions, color and attainable purity vary among deposits.
- Which of these regional variation hold for the sense of halite this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- sodium chloride - Sodium chloride is the chemical substance; halite is its naturally occurring crystalline mineral species.
- rock salt - Rock salt is a rock or mined material composed predominantly of halite and potentially other minerals; halite names the mineral itself.
- table salt - Table salt is a food product with controlled composition and potentially additives; mineral identity alone does not establish food suitability.
- sylvite - Sylvite is potassium chloride, KCl, whereas halite is sodium chloride, NaCl.
- brine - Brine is an aqueous salt solution; halite is a crystalline solid.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of halite this model covers, and on what evidence? provenance
What the second pass must settle
- Does an existing Vercy world model already cover halite, and how should this entry relate to sodium chloride, rock salt, and synthetic NaCl crystals?
- Which authoritative mineral references and analytical criteria should establish identification confidence and condition-dependent reference properties?
- What humidity-response evidence applies to impure natural halite and mixed evaporite lots, and when are pure-NaCl reference values insufficient?
- Which CAS, PubChem, EC, GHS, and exposure-limit records apply to the chemical substance or supplied material, and how should they be linked without treating them as unique identifiers of the mineral species?
- Which sampling methods and acceptance specifications are needed for the intended applications, especially where impurities or fluid inclusions are unevenly distributed?