Zinc Ore (Sphalerite in Matrix)
Sphalerite (Zn,Fe)S within a carbonate or silicate host rock
mineral
Category
Mineral (Metal)
Browse mineral (metal) specimens identified by the Rock Identifier community.
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Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Diamond
Diamond (C)
mineral
Pyrite with Calcite
Iron Disulfide (FeS2) with Calcium Carbonate (CaCO3)
mineral
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Turquoise cabochon jewelry
Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Gold Ore
Native Gold (Au)
mineral
Native Copper (in coinage alloy)
Copper (Cu)
mineral
Porphyritic basalt or weathered volcanic rock
Basalt, likely plagioclase–pyroxene rock with possible olivine; exact identification requires testing
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Native gold-bearing sulfide specimen
Native gold (Au), likely intergrown with pyrite (FeS₂) or chalcopyrite (CuFeS₂)
mineral
Diamond ring
Diamond (crystalline carbon, C)
gemstone
Polished brecciated jasper
Microcrystalline quartz (SiO₂) with iron-oxide-rich matrix and possible chalcedony
mineral
Polished labradorite pendant
Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)
mineral
Native Copper in Matrix
Native Copper (Cu)
mineral
Likely hematite-rich ironstone or metallic mineral fragment
Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron
mineral
Beryl (Emerald Variety)
Beryllium Aluminum Silicate (Be3Al2(SiO3)6)
mineral
Quartz Vein in Host Rock
Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)
metamorphic
Quartzite (Milky Quartz pebble)
Silicon Dioxide (SiO2)
metamorphic
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Quartz Vein in Schist
Quartz (SiO2) in Pelitic Schist
metamorphic
Vesicular basalt pebble
Basalt; chiefly plagioclase, pyroxene, and olivine
igneous
Slag
Anthropogenic glassy silicate
Mineral-like byproduct
Gold Ore (in Quartz/Pyrite)
Native Gold (Au) with Quartz (SiO2) and Pyrite (FeS2)
mineral
Bauxite
Bauxite (Mixture of Hydrous Aluminum Oxides)
sedimentary
Labradorite cabochon
Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
mineral
Slag Glass (Cullet Glass)
Amorphous Silica (Industrial byproduct)
mineral
Red Granite
Intrusive Igneous Rock (Felsic)
igneous
Granite Pebble
Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Amethyst ring
Amethyst, purple quartz (SiO₂), likely set with diamond or other accent stones
gemstone
Diamond ring
Diamond (crystalline carbon, C)
gemstone
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Hollow geode or vesicular volcanic rock
Likely quartz-lined basaltic/andesitic vesicle; exact identification requires testing
igneous
Biotite schist
Mica schist, composed mainly of biotite mica and quartz with feldspar and iron oxides
metamorphic
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Tiger Iron
Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Stony-Iron Meteorite (likely Mesosiderite or Ordinary Chondrite)
Meteorite (Silicate-Metal Matrix)
meteorite