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19Published minerals
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Galena
Galena is the primary natural mineral form of lead(II) sulfide (PbS), crystallizing in the isometric crystal system with a halite-type rock-salt crystal structure. As the world's most critical and abundant ore of lead—and a major historical source of byproduct silver—galena is celebrated for its high specific gravity (~7.6), splendent metallic luster, lead-gray streak, and perfect cubic...
ColorGray, Black
Mohs2.5 - 2.75
WearabilityDisplay only
Chemical FormulaPbS
Cattierite
Cattierite is a rare cobalt sulfide mineral with the chemical formula CoS₂, belonging to the pyrite group. First discovered in the rich stratiform copper-cobalt deposits of the Katanga Copperbelt in the Democratic Republic of the Congo, it typically occurs as metallic pinkish-gray to dark gray microscopic crystals, cubes, and granular aggregates associated with other base-metal sulfides.
ColorPink, Gray, Black
Mohs4 - 4.5
WearabilityPoor
Chemical FormulaCoS₂
Kernowite
Kernowite is a rare copper iron arsenate hydrate mineral discovered in St Day, Cornwall, UK. It is the iron-dominant analogue of liroconite. Known for its distinct emerald-green crystals, it crystallizes in the monoclinic system and typically forms as tabular to wedge-shaped crystals in oxidized copper deposit zones.
ColorGreen (G), bluish Green (bG)
Mohs2 - 2.5
WearabilityPoor
Chemical FormulaCu₂Fe(AsO₄)(OH)₄·4H₂O
Sicherite
Sicherite is an exceedingly rare thallium arsenic sulfosalt mineral belonging to the orthorhombic crystal system, first discovered in the cavities of Triassic dolomites at the famed Lengenbach Quarry, Switzerland.
ColorNot listed
Mohs2.5 - 3
WearabilityPoor
Chemical FormulaTlAg₂(As,Sb)₃S₆
Nacrite
Nacrite is a kaolin-group clay mineral and a polymorph of kaolinite with the formula Al₂Si₂O₅(OH)₄. It occurs as white, pearly, tabular crystals or fine scaly aggregates, commonly in hydrothermal alteration assemblages.
ColorColorless, Yellow (Y), Green (G), White, Brown
Mohs2 - 2.5
WearabilityDisplay only
Chemical FormulaAl₂Si₂O₅(OH)₄
Geversite
Geversite is a rare platinum-group mineral (PGM) with the chemical composition PtSb₂, crystallizing in the isometric pyrite structure type. First described from the Driekop Mine in the Bushveld Igneous Complex, South Africa, it forms microscopic metallic grains, euhedral cubes, and complex intergrowths typically hosted in ultramafic rocks, chromitites, and magmatic sulfide deposits.
ColorWhite, Gray
Mohs4.5 - 5.5
WearabilityPoor
Chemical FormulaPtSb₂
Bismutotantalite
Bismutotantalite is a rare heavy tantalum-bismuth oxide mineral belonging to the columbite-tantalite group, crystallizing in the orthorhombic crystal system. Characterized by an exceptionally high specific gravity (up to 8.98–9.0 g/cm³), sub-adamantine to resinous luster, and high refractive indices, it occurs as a late-stage accessory mineral in highly fractionated, lithium-cesium-tantalum (LCT) enriched granitic pegmatites.
ColorBrown, Black
Mohs5 - 5.5
WearabilityPoor
Chemical FormulaBiTaO₄
Halite
Halite is the mineral form of sodium chloride (NaCl), commonly known as rock salt. It forms isometric crystals in evaporite deposits and is essential to human life, industry, and chemical production.
ColorColorless, White
Mohs2 - 2.5
WearabilityPoor
Chemical FormulaNaCl
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Crystal structure
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Optical properties
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Use & safety
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