gemmology-mineral-database 2.1.1

Crystal presets database for gemmological and mineralogical visualization

mineral-database

Mineral Database - A comprehensive database of mineral crystal habits with CDL notation and gemmological properties for visualization applications.

Part of the Gemmology Project.

Installation

pip install mineral-database

Quick Start

from mineral_database import get_preset, list_presets, search_presets

# Get a specific mineral preset
diamond = get_preset('diamond')
print(diamond['cdl'])      # 'cubic[m3m]:{111}@1.0 + {110}@0.2'
print(diamond['system'])   # 'cubic'
print(diamond['hardness']) # 10

# List all presets
all_presets = list_presets()

# List presets by crystal system
cubic_presets = list_presets('cubic')

# Search presets
garnet_matches = search_presets('garnet')

Features

• 140 CDL expressions across 96 mineral families (68 natural + 15 synthetic + 9 simulant + 4 composite)
• CDL v2.0 notation for crystal habit visualization, including amorphous, nested growth, and aggregate expressions
• FGA-standard properties (RI, SG, optical character, etc.)
• SQLite backend for fast queries
• Full-text search across mineral names and properties
• Backwards compatible with original CRYSTAL_PRESETS dict API

Database Contents

The database includes presets for all major crystal systems:

System	Count	Examples
Cubic	~25	Diamond, Garnet, Fluorite, Pyrite
Hexagonal	~8	Beryl, Emerald, Aquamarine, Apatite
Trigonal	~15	Quartz, Ruby, Sapphire, Tourmaline
Tetragonal	~5	Zircon, Rutile, Cassiterite
Orthorhombic	~10	Topaz, Peridot, Tanzanite
Monoclinic	~10	Kunzite, Epidote, Gypsum
Triclinic	~5	Turquoise, Kyanite, Labradorite
Amorphous	~7	Opal, Pearl, Malachite, Turquoise, Sodalite, Lazurite
Twins	~15	Japan Law, Spinel Macle, Iron Cross

CDL v2.0 Expressions

All 140 CDL expressions parse successfully with CDL v2.0, including:

• Amorphous expressions for materials without crystalline structure: opal (amorphous[opalescent]:{botryoidal}), pearl, malachite, turquoise, sodalite, lazurite, rhodochrosite (banded form)
• Nested growth expressions using the > operator: scepter quartz, phantom quartz, diamond phantom
• Aggregate expressions using the ~ operator: quartz cluster, amethyst geode druse, pyrite cluster, fluorite cluster, calcite parallel growth
• Doc comments (#!) on major expressions documenting system, habit, and species information

Database Completeness (Updated 2026-01-25)

The mineral database has been comprehensively enriched with FGA-standard gemmological data:

• 96 mineral families (68 natural + 15 synthetic + 9 simulant + 4 composite) with complete crystallographic data
• 92/95 minerals (96.8%) with complete RI (refractive index)
• 94/95 minerals (98.9%) with complete SG (specific gravity)
• 94/95 minerals (98.9%) with optical character classification
• 93/95 minerals (97.9%) with pleochroism data
• 94/95 minerals (98.9%) with lustre, cleavage, and fracture data
• 60/95 minerals (63.2%) with dispersion values
• 40+ gemstones with comprehensive treatments and diagnostic inclusions

Data Completeness by Crystal System

System	Minerals	RI	SG	Optical Character
Cubic	26	92.3%	100%	100%
Trigonal	19	100%	100%	100%
Monoclinic	15	100%	100%	100%
Orthorhombic	13	92.3%	92.3%	92.3%
Hexagonal	8	100%	100%	100%
Triclinic	7	100%	100%	100%
Tetragonal	6	100%	100%	100%
Amorphous	1	100%	100%	100%

Data Sources

• FGA (Fellowship of the Gemmological Association) curriculum materials
• Mindat.org mineralogical database
• GIA (Gemological Institute of America) gem encyclopedia
• Webmineral.com physical property database
• International Gem Society reference materials

All data has been cross-validated against multiple authoritative sources and validated for consistency with crystal system optical properties.

API Reference

Query Functions

from mineral_database import (
    get_preset,           # Get preset dict by name
    get_mineral,          # Get Mineral object by name
    list_presets,         # List preset names
    list_preset_categories,  # List categories
    search_presets,       # Full-text search
    filter_minerals,      # Filter by criteria
    get_presets_by_form,  # Get by crystal form
    count_presets,        # Total count
)

Backwards Compatibility

The package provides dict-like CRYSTAL_PRESETS for code migration:

from mineral_database import CRYSTAL_PRESETS

# All dict operations work
preset = CRYSTAL_PRESETS['diamond']
preset = CRYSTAL_PRESETS.get('ruby')
'garnet' in CRYSTAL_PRESETS
for name in CRYSTAL_PRESETS:
    print(name)

Mineral Object

from mineral_database import get_mineral, Mineral

mineral = get_mineral('ruby')
print(mineral.id)           # 'ruby'
print(mineral.name)         # 'Ruby'
print(mineral.system)       # 'trigonal'
print(mineral.chemistry)    # 'Al2O3:Cr'
print(mineral.hardness)     # 9
print(mineral.ri)           # '1.762-1.770'
print(mineral.localities)   # ['Myanmar', 'Mozambique', ...]

Property Formatting

from mineral_database import (
    INFO_GROUPS,
    get_info_properties,
    get_property_label,
    format_property_value,
)

# Get FGA-style properties
props = get_info_properties('ruby', 'fga')
# Returns: {'name': 'Ruby', 'ri': '1.762-1.770', 'sg': 4.0, ...}

# Format for display
label = get_property_label('sg')  # 'SG'
value = format_property_value('sg', 4.0)  # '4'

CLI Usage

# List all presets
mineral-db --list

# List by crystal system
mineral-db --list cubic

# Show preset details
mineral-db --info diamond

# Search presets
mineral-db --search garnet

# Output as JSON
mineral-db --json ruby

# Show categories
mineral-db --categories

Database Schema

The SQLite database stores minerals with full gemmological properties:

# Core fields (all minerals)
id, name, cdl, system, point_group, chemistry, hardness, description

# Optional gemmological properties
sg, ri, birefringence, optical_character, dispersion, lustre,
cleavage, fracture, pleochroism, twin_law, phenomenon

# List fields (JSON-encoded)
localities, forms, colors, treatments, inclusions

Building the Database

For development, you can rebuild the database from source:

# From legacy Python dict
python scripts/build_db.py --from-legacy crystal_presets.py -o minerals.db

# From YAML files
python scripts/build_db.py --from-yaml data/source/minerals -o minerals.db

# Export to YAML for editing
python scripts/build_db.py --export-yaml minerals.db -o data/source/minerals

Development

# Clone and install
git clone https://github.com/gemmology-dev/mineral-database.git
cd mineral-database
pip install -e ".[dev]"

# Run tests
pytest

# Build database
python scripts/build_db.py --from-legacy /path/to/crystal_presets.py -o src/mineral_database/data/minerals.db

License

MIT License - see LICENSE for details.

Related Projects

• cdl-parser - CDL notation parser
• crystal-geometry - 3D geometry from CDL
• crystal-renderer - SVG/3D rendering
• gemmology-plugin - Claude Code plugin