Published
crystal
vr.tr.crystal · thing-q43533
Let an agent describe crystals by structure, symmetry and properties, and point to crystallographic databases.
Thing Registry Physical world and living systems PHY.OBJ
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Structure Lattice.
Symmetry
System and space group.
Space group
Symbol and number.
- Which space group? provenance
- Which crystal system? provenance
Unit cell
Parameters.
Unit cell
Cell lengths and angles with units and uncertainties, measurement temperature and pressure.
- What are the cell parameters? measurement
- From which structure determination? provenance
Composition What it is made of.
Substance
Chemistry.
Substance
Formula.
- What substance? provenance
- Which polymorph? boundary
Bonding
Type.
Bonding
Type.
- Ionic, covalent, molecular or metallic? boundary
- Per which source? provenance
Form Habit and size.
Habit
Shape.
Habit
Description.
- What habit? provenance
- Which faces? provenance
Defects
Imperfections.
Defect
Type.
- Which defects? provenance
- Measured how? provenance
Determination Methods.
Method
Diffraction.
Method
Technique.
- Which method (X-ray, neutron, electron)? provenance
- At what temperature? measurement
Record
Database entry.
Database entry
ID.
- Which database entry? provenance
- Which CIF? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.OBJ
- Other names and narrower kinds
- wax crystal, oikocryst, covalent crystal, aperiodic crystal, ferromagnetic crystal, purple gemstone, subhedral crystal, cheese crystals, single-layer materials, Titan:Sapphire, metamict, incommensurable crystal
What it is Filled
A solid whose atoms, ions or molecules are arranged in a highly ordered, repeating pattern (a crystal lattice) extending in three dimensions; single crystals have one continuous lattice, while most solids are polycrystalline; since 1992 the IUCr definition also covers aperiodic crystals with an essentially discrete diffraction pattern.
Why it exists Filled
Let an agent describe crystals by structure, symmetry and properties, and point to crystallographic databases.
Distinguishing features Filled
- Seven crystal systems, 14 Bravais lattices and 230 space groups describe periodic crystals.
- X-ray diffraction reveals crystal structure.
- Glass is amorphous, not crystalline; lead 'crystal' glass is a misnomer.
What robots and AI may and may not do Filled
Must not
- endorse healing claims
May
- explain structure and point to databases
Moral aspects Filled
- scientific accuracy
Who is affected
- learners
- consumers
Owners Filled
Steward
nobody; a state of matter
Master systems
- Cambridge Structural Database
- Crystallography Open Database
- ICSD
Links to other meta-models Filled
parent
- Q11438 - registry parent class
- Q79529 - registry parent class
- Q908049 - registry parent class
related
- crystallography - science
- space group - symmetry
- amorphous solid - disorder
- polycrystal and liquid crystal - aggregate of grains; a different state of matter
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.crystal
- Wikidata: Q43533 (https://www.wikidata.org/wiki/Q43533)
- CSD refcode: 6 letters, optionally followed by 2 digits Cambridge Structural Database structure record
- COD ID: 7 digits Crystallography Open Database structure record
- ICSD collection code: numeric inorganic structure record; not a physical specimen
Direct properties not applicable Not applicable
Not applicable
Properties belong to each crystalline substance.
Recognition required Filled
- Flat faces, sharp edges and regular angles in well-formed specimens
- Often flat faces and regular shapes (habit), though many crystals are microscopic grains.
Capabilities and actions required Filled
- explain crystal systems and lattices
- find structures in crystallographic databases
- explain crystal growth
- distinguish crystals from amorphous solids
Hazards and failure modes required Filled
- Material-specific hazards and degradation (toxicity, cleavage, dissolution, phase change)
- Pseudoscientific health claims about crystals
Standards and interfaces required Filled
- IUCr definitions and International Tables for Crystallography
- CIF (Crystallographic Information File) format
Context of use required Filled
- A fundamental form of solid matter.
- single crystal
- ionic crystal
- covalent network crystal
- molecular crystal
- metallic crystal
- quasicrystal (aperiodic)
Sources Filled
- Q43533 - identity of the registry item, labels and sitelinks
- Crystal - general description of the subject
- Crystal - Long-range order, periodic and aperiodic crystals, diffraction definition and the 1992 reference.
- How to read (and understand) Volume A of International Tables for Crystallography - Crystal systems, Bravais lattices, space groups and unit-cell geometry.
- Can I search on CSD refcodes within ConQuest? - Six-letter refcodes and optional two-digit suffixes.
- Crystallography Open Database: an open-access collection of crystal structures and platform for world-wide collaboration - Seven-digit COD numbers identify particular structure determinations.
- ICSD Scientific Manual - Inorganic structure records, numeric collection codes and recorded crystallographic properties.
- Crystallographic Information Framework - CIF terminology, IUCr stewardship and representation of crystallographic measurements.
Open questions
- The registry merges a gemstone colour sense and specific crystal forms; they need review.
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q43533/spec.json