aragonite
Enable an AI agent to identify aragonite, assess its material condition and select investigations or interventions that preserve or deliberately change its calcium carbonate phase.
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.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to identify aragonite, assess its material condition and select investigations or interventions that preserve or deliberately change its calcium carbonate phase.
Aragonite is the orthorhombic polymorph of calcium carbonate (CaCO3), metastable relative to calcite at ambient surface conditions and the dominant biomineral of many marine skeletons and of high-pressure/high-temperature inorganic precipitates.
It can be Select and document a phase-identification method appropriate to specimen size and permitted sample loss; Map aragonite against associated or replacement phases before assigning bulk properties; Choose sampling locations that preserve diagnostic twins, needles and growth interfaces; Monitor changes in phase fraction, surface condition or specimen integrity across exposures; Evaluate a proposed cleaning, fluid-contact or thermal treatment against specimen-specific evidence; Route an identified material toward a proposed use only after checking the required phase purity, texture and contamination limits.
Distinguishing features
Require a phase-sensitive result, such as a reference-matched diffraction pattern, to distinguish aragonite from calcite and vaterite; the shared CaCO3 composition does not settle identity. Aragonite is orthorhombic. [Handbook of Mineralogy](https://www.handbookofmineralogy.org/pdfs/aragonite.pdf)
Use repeated contact twinning and an apparently hexagonal outline as supporting observations: aragonite can form pseudohexagonal twins, so external outline alone does not establish crystal symmetry. [Handbook of Mineralogy](https://www.handbookofmineralogy.org/pdfs/aragonite.pdf)
For a suitable clean specimen, compare measured density with approximately 2.95 g/cm³ and hardness with Mohs 3.5-4; these are consistency checks, not standalone identification criteria. [Handbook of Mineralogy](https://www.handbookofmineralogy.org/pdfs/aragonite.pdf)
Where optical mineralogy is feasible, check for biaxial negative behavior alongside other evidence; report whether grain size, orientation or opacity prevents interpretation. [Handbook of Mineralogy](https://www.handbookofmineralogy.org/pdfs/aragonite.pdf)
Test suspected replacement or mixed material at multiple locations; an aragonite-like outer form must not substitute for evidence of the phase currently present.
Scope
+ Evidence establishing aragonite phase identity and distinguishing mixtures or replacements
+ Composition and impurities of the identified aragonite portion
+ Crystal habit, twinning, grain texture and attachment to surrounding material
+ Formation context and subsequent treatment relevant to interpreting the material
+ Dissolution, phase change, physical damage and suitability for proposed actions
- Calcite, vaterite and other mineral species except as identification alternatives or associated phases
- Whole-rock classification and geological deposit models
- Organism biology and whole-shell or skeletal function
- Manufactured composite products and their complete performance specifications
- Water-body chemistry and carbonate cycling beyond conditions affecting the assessed aragonite
Characteristics
- Aragonite identification status
- suspected | supported | confirmed within tested region | contradicted | unresolved Controls whether an agent may treat aragonite-specific conclusions as established.
- Phase-sensitive identification evidence
- Link to diffraction or spectroscopic record, reference match, sampled region and interpretation Makes identification inspectable and limits it to the material actually tested.
- Aragonite phase fraction
- Mass % with method, uncertainty, detection limits and denominator; unknown if unmeasured Separates a predominantly aragonite material from a trace occurrence or partly transformed specimen.
- Elemental composition and substitutions
- Element-specific mass %, mol % or mg/kg with analytical basis and sampled region Supports composition checks and distinguishes lattice chemistry from inclusions or coatings.
- Habit and aggregate texture
- Observed habit, twin interpretation, grain arrangement and uncertainty Guides identification, representative sampling and protection of fragile structures.
- Crystal or grain dimensions
- µm or mm with size distribution, measurement direction and method Determines which analyses can resolve individual grains and what handling is practical.
- Host and associated phases
- Links to host material, contacting minerals, organic matrix and mapped interfaces Prevents bulk measurements and treatment responses from being assigned solely to aragonite.
- Formation attribution
- biogenic | abiogenic natural | synthetic | mixed | unknown, with supporting evidence Frames interpretation without treating origin claims as proof of phase identity.
- Surface and structural condition
- Recorded extent of cracking, detached grains, surface loss, coatings and suspected replacement Determines whether sampling, cleaning or transport could destroy relevant evidence.
- Exposure and treatment history
- Dated records of fluid contact, heating, mechanical processing, cleaning and consolidation Helps distinguish original material features from changes introduced after formation.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.aragonite
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 11 findings · 22 questions.
Phase identity Establish whether the examined material currently contains aragonite and how far that conclusion extends.
A calcium carbonate composition or familiar crystal outline cannot by itself establish aragonite identity.
Polymorph discrimination
Resolve aragonite against alternative calcium carbonate phases using inspectable evidence.
Phase assignment
Record the diagnostic result, reference used and limitations of the aragonite assignment.
- Which measured features support aragonite, and what reference and interpretation were used? measurement
- Does the evidence distinguish aragonite from calcite, vaterite and unresolved mixed material? boundary
Identity coverage
Separate an identified grain or surface from conclusions about the complete specimen.
Spatial phase extent
Establish where aragonite occurs and whether external form conceals a different internal phase.
- Which surfaces, grains or interior regions were tested, and what remains unexamined? measurement
- Could the specimen be an intergrowth, coating or replacement retaining an earlier aragonite-like form? boundary
Composition and associations Describe the chemistry of the aragonite portion separately from surrounding constituents.
An agent needs to know whether measured chemistry belongs to aragonite, another phase or an added treatment.
Aragonite chemistry
Characterize composition at the scale needed for identification and intended use.
Composition attribution
Tie chemical measurements to identified aragonite and retain uncertainty about substitutions.
- What composition was measured specifically in regions independently identified as aragonite? measurement
- What evidence separates lattice substitutions from inclusions, surface residues or analytical overlap? boundary
Mixed material context
Account for phases and matrices that affect bulk observations and treatment behavior.
Associated material map
Record the amount and arrangement of non-aragonite constituents.
- Which mineral phases, organic components or applied coatings contact or enclose the aragonite? measurement
- What material and normalization basis does the reported aragonite fraction describe? definition
Crystal texture and integrity Capture the aragonite geometry and damage that determine recognition and physical handling.
Diagnostic crystal arrangements and fragile projections can be lost during otherwise routine examination.
Habit and twinning
Separate observed external geometry from crystallographic interpretation.
Diagnostic growth geometry
Record grain dimensions, aggregate arrangement and the evidence supporting a twin interpretation.
- What crystal dimensions, elongation, aggregate texture and apparent symmetry are observed? measurement
- Is the proposed twinning established crystallographically or inferred only from external shape? boundary
Fracture and attachment
Assess whether grains and projections can survive the proposed manipulation.
Handling-sensitive structures
Locate cracks, loose grains and weak attachment points before physical intervention.
- Where are cracks, detached needles, crumbling aggregates or weakened host interfaces present? measurement
- Which supports, contact points and sampling locations preserve the diagnostic structure? action
Formation and change Distinguish formation evidence from later alteration and processing.
Present aragonite identity, inferred origin and subsequent material change require separate evidence.
Formation evidence
Connect the identified phase to its claimed natural, biological or synthetic origin.
Origin attribution
Record the basis and limits of the formation interpretation.
- What locality, host, biological association or synthesis record supports the claimed origin? provenance
- Which formation conditions are directly documented, and which are inferred from the material? boundary
Alteration evidence
Assess suspected phase replacement or surface loss without assigning an unsupported rate or cause.
Documented material change
Tie observed changes to dated measurements and exposure records.
- Do comparable observations show a change in aragonite fraction, surface relief or material quantity? measurement
- What fluid, thermal or processing history could explain the change, and what causal evidence is missing? provenance
Investigation and treatment decisions Translate identification and condition evidence into bounded analytical and treatment choices.
Testing or processing may consume material or change the phase and texture an agent is trying to evaluate.
Analytical intervention
Choose an investigation that resolves the actual uncertainty with acceptable specimen impact.
Fit-for-question analysis
Match the required phase or composition evidence to resolution and sample-loss constraints.
- Which unresolved decision requires bulk phase quantification, local phase mapping or chemical analysis? action
- What sample consumption, spatial resolution and preparation effects are acceptable for this aragonite material? boundary
Treatment and use
Evaluate proposed interventions against the desired aragonite state and associated material constraints.
Intervention acceptance
Define observable success and stop conditions before cleaning, exposure, heating or processing.
- Must the action preserve aragonite identity, crystal texture and host attachment, or deliberately change specified features? action
- What specimen-specific evidence supports the treatment conditions, and what measured change requires stopping? action
- Which phase-purity, grain-size and contamination requirements must be verified for the proposed use? boundary
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.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- inorganic hydrothermal/vein aragonite
- sedimentary marine aragonite mud and ooids
- biogenic aragonite (mollusc nacre, coral, pteropod)
- speleothem/anthodite aragonite
- aragonite as a high-pressure metamorphic index mineral
- witherite-strontianite solid-solution members sometimes sold as 'aragonite'
- Which of these kinds and varieties hold for the sense of aragonite this model covers, and on what evidence? provenance
What the second pass must settle
- What minimum analytical evidence and reporting limits should qualify an aragonite identification as confirmed across single crystals, powders and biological composites?
- Under which specimen-specific fluid and temperature conditions do dissolution or conversion become significant over the intended storage or use period?
- How should substituted compositions be bounded against neighboring mineral species using authoritative mineral nomenclature?
- Which cleaning, mounting and consolidation methods preserve both aragonite and its associated matrices in each relevant specimen class?
- Does an existing Vercy world model already own this mineral concept, requiring this registry entry to link to it instead of receiving a separate publication?