turquoise
Enable an agent to recognise turquoise as a mineral material, assess its identity, treatment and condition, and decide appropriate testing, handling and 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 turquoise as a mineral material, assess its identity, treatment and condition, and decide appropriate testing, handling and use.
Turquoise is an opaque blue-to-green triclinic mineral, ideally a hydrated copper aluminium phosphate with formula CuAl6(PO4)4(OH)8·4H2O, used as a gemstone and ornamental material.
It can be Select minimally damaging observations and tests to assess turquoise identity.; Record matrix, colour variation and sampling locations before interpreting measurements.; Classify treatment and construction claims with explicit evidence and uncertainty.; Assess whether a specimen is suitable for cutting, polishing, mounting or collection storage.; Choose cleaning and handling actions based on condition and known treatments.; Produce an identification record that separates measured results, supplier claims and unresolved questions..
Distinguishing features
Require mineralogical evidence consistent with turquoise rather than accepting blue-green colour as identification.
Distinguish turquoise from similarly coloured variscite, chrysocolla and dyed howlite or magnesite using appropriate compositional and structural tests.
Examine whether the specimen has a natural mineral fabric, a synthetic growth fabric or fragments bound into a manufactured aggregate.
Separate turquoise identity from treatment status: material may contain turquoise while its colour or cohesion depends on dye, resin or another added substance.
Treat dark veining and claimed locality as supporting observations whose authenticity needs checking, rather than decisive identification tests.
Scope
+ Mineral identity, composition and evidence distinguishing turquoise from related minerals
+ Natural occurrence, associated matrix and variation within a specimen
+ Untreated, stabilised, impregnated, dyed or otherwise modified turquoise
+ Physical condition, durability and suitability for handling or working
+ Specimen provenance and substantiation of identification and treatment claims
- Turquoise as a colour name, pigment specification or digital colour value
- Jewellery design, settings and finished ornament construction
- Mining operations and mineral deposit economics
- Imitation materials as independently modelled substances
- Marketplace valuation and cultural ownership systems
Characteristics
- Mineralogical identification
- unexamined | provisional | analytically supported | disputed Controls whether the agent can identify the material as turquoise or must retain a qualified description.
- Composition and related mineral phases
- Elemental or oxide concentrations in mass percent, with method, sampling location and uncertainty Supports identification and separates variation within turquoise from other phases or mixed material.
- Material construction
- natural coherent material | synthetic material | reconstituted aggregate | composite | unresolved Distinguishes a mineral specimen from a manufactured material containing or resembling turquoise.
- Colour and distribution
- Colour coordinates or controlled-light description, including patches, veins and surface-to-interior differences Records appearance while allowing investigation of dye, alteration and uneven material.
- Matrix association
- Identified associated minerals or host rock, their distribution and estimated proportion Matrix can affect interpretation, workability and the representativeness of a test.
- Treatment status
- unknown | none detected by stated tests | stabilised | impregnated | dyed | coated | other documented treatment; multiple values allowed Treatment affects disclosure, testing choices, care and interpretation of physical measurements.
- Density
- g/cm³, with method, uncertainty and matrix or treatment qualifications Provides supporting identification evidence without treating mixed or impregnated material as a pure mineral sample.
- Fracture and surface condition
- Mapped cracks, friability, chips, polish loss, staining and observed changes Determines whether sampling, cutting, cleaning or mounting would risk damage.
- Origin attribution
- Claimed or documented locality linked to collection records, supplier evidence or analytical reports Keeps documentary provenance separate from locality inferred from appearance.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.turquoise
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 17 findings · 27 questions.
Turquoise identity Establish what mineral material is present and what the turquoise designation covers.
Colour and trade naming alone cannot establish mineral identity or the boundary of a mixed specimen.
Mineral composition
Connect the turquoise designation to compositional and structural evidence.
Evidence for turquoise identification
Record the analytical basis for identification and any unresolved related or associated phases.
- What compositional and structural criteria establish turquoise identity and separate it from related mineral species? definition
- Which tests were performed, on which parts of the specimen, and with what identification confidence? measurement
Lookalikes and constructions
Separate turquoise from substitutes and determine whether the examined material is natural, synthetic or assembled.
Discrimination from substitutes
Require evidence that addresses plausible imitations, synthetic material and reconstituted products.
- What observations distinguish this specimen from dyed howlite or magnesite, variscite, chrysocolla, glass and resin imitations? boundary
- Does microscopy or other testing show natural fabric, synthetic growth, bound fragments or an assembled surface layer? measurement
Occurrence and matrix Describe the natural material represented by the specimen and assess claims about its origin.
Turquoise may occur with substantial host material, while locality claims require evidence beyond a familiar colour or vein pattern.
Specimen fabric
Record turquoise distribution, host material and internal variation.
Matrix and turquoise continuity
Describe which portions are turquoise and how associated material affects testing and use.
- Which veins, inclusions and host-rock portions are present, and how were their identities established? measurement
- Does a result from the tested surface or fragment represent the whole specimen, including its interior and matrix? boundary
Locality evidence
Assess collection history and the support for geographic attribution.
Support for origin claims
Separate documented extraction or collection locality from supplier attribution and appearance-based inference.
- What collection records, mine records or transfer documents connect this specimen to the claimed locality? provenance
- Can any available analytical evidence support that locality, and which alternative origins remain plausible? boundary
Treatment and disclosure Determine whether added materials or processing influence the specimen's appearance and cohesion.
Turquoise identity does not by itself establish whether its colour, surface or mechanical behaviour is natural.
Colour modification
Investigate dye, coatings and other modifications to visible appearance.
Evidence of colour treatment
Record observations and tests relevant to artificial colour without treating visual suspicion as proof.
- Is colour concentrated in fractures, pores, coatings or surface zones, and what additional testing would clarify its cause? measurement
- Which colour-treatment claims come from records, and which are supported by direct examination? provenance
Impregnation and binding
Distinguish treatments of coherent material from binders that construct an aggregate.
Role of added material
Identify whether resin, wax or another substance fills pores, coats a surface or binds separate particles.
- What added substances are detected, where are they located, and what methods support their identification? measurement
- Does the added substance stabilise an existing coherent specimen or create cohesion between separate turquoise fragments? boundary
- How should the material be described when treatment is known, suspected or undetectable by the tests performed? action
Condition and permitted work Use the specimen's physical state and treatment history to select handling, testing and fabrication actions.
A sound polished piece, a friable specimen and a resin-treated aggregate may require different interventions despite sharing a turquoise label.
Physical integrity
Assess fractures, porosity, cohesion and the effects of matrix on workability.
Workability assessment
Connect measured or observed condition to the likelihood of damage during sampling and fabrication.
- Where are cracks, friable zones, cavities and weak matrix interfaces, and do they intersect the proposed working area? measurement
- What evidence supports proceeding with cutting, drilling, polishing or mounting this particular specimen? action
Care and exposure
Determine compatible care methods and distinguish intact-specimen handling from dust-generating work.
Compatibility of interventions
Assess cleaning, heat, moisture, chemical contact and working exposures against the actual material and its treatments.
- Which cleaning agents and exposure conditions are supported as compatible with this turquoise, its matrix and any detected treatment? action
- What material-specific evidence and safety information are needed before an operation generates dust or heats added binders? action
- What baseline photographs or measurements would reveal colour change, cracking or surface deterioration after intervention? measurement
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 describes the mineral and gem material, not the colour; all information is recalled rather than researched.
- Physical properties vary with porosity, inclusions and treatment; the ranges are approximate identification aids.
- Verify current disclosure standards and any claimed geographic origin; no numerical chemical-registry identifiers or hazard classifications are asserted.
- Which of these check these first hold for the sense of turquoise this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Matrix-free turquoise
- Matrix-bearing turquoise, including spiderweb turquoise
- Which of these kinds and varieties hold for the sense of turquoise 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 - CuAl6(PO4)4(OH)8·4H2O - Ideal mineral composition; substitutions, inclusions and treatments can change the composition of a specimen.
- Which of these identifiers and schemes hold for the sense of turquoise this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- CIBJO's Gemstone Book provides nomenclature and treatment-disclosure guidance for gemstones, including turquoise; it is an industry standard rather than universal legislation.
- Which of these standards and regulation hold for the sense of turquoise this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Cabochons and beads for jewellery
- Inlay in jewellery and decorative objects
- Carvings and ornamental objects
- Mineralogical specimens
- Which of these real-world use hold for the sense of turquoise 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 - 5-6 - Mohs scale
- Specific gravity - Approximately 2.6-2.9; porosity and treatment affect measured values - dimensionless
- Which of these typical measurements hold for the sense of turquoise 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.
- Porous material can absorb oils, cosmetics and other contaminants, changing its appearance.
- Heat can cause discoloration, dehydration or cracking.
- Acids can attack the mineral.
- Brittleness and variable cohesion can cause chipping or crumbling during cutting and wear.
- Dyed imitations, reconstructed material and undisclosed resin impregnation can lead to misidentification or incorrect valuation.
- Which of these failure modes and hazards hold for the sense of turquoise this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Iran, the southwestern United States and China are established sources; colour, matrix and porosity vary within as well as between deposits.
- Trade descriptions such as 'Persian turquoise' may refer to appearance rather than verified geographic origin.
- Which of these regional variation hold for the sense of turquoise 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.
- Turquoise colour - The colour term describes an appearance; the mineral is identified by composition and crystal structure.
- Chalcosiderite - A related mineral in which ferric iron occupies the positions occupied predominantly by aluminium in turquoise.
- Variscite - A hydrated aluminium phosphate with a different composition and structure, lacking turquoise's essential copper.
- Dyed howlite - A borate mineral coloured to imitate turquoise; mineralogical and gemmological testing separates it.
- Stabilized turquoise - Turquoise impregnated with a strengthening substance, commonly resin; treatment status must be distinguished from mineral identity.
- Reconstructed turquoise - Manufactured material assembled from particles and a binder, rather than an intact natural mineral aggregate.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of turquoise this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative mineralogical criteria and reference measurements should define turquoise and its boundaries with related mineral species?
- Which minimally damaging test sequence reliably distinguishes natural turquoise, synthetic turquoise, common imitations and reconstituted material?
- What treatment terminology and disclosure conventions apply to stabilised, impregnated, dyed and composite turquoise in the intended catalogue context?
- How reliably can locality claims be tested, and what evidence is sufficient to move an attribution from claimed to supported?
- Which care limits and occupational exposure requirements apply to turquoise with different matrices and treatments, and which chemical identifiers or hazard records actually cover those materials?