Potassium Feldspar (Orthoclase / Microcline)
KAlSi3O8
mineral
Category
Igneous, Sedimentary, Metamorphic
Browse igneous, sedimentary, metamorphic specimens identified by the Rock Identifier community.
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite / Iron-Rich Basalt
Magnetite bearing Mafic Rock (Fe3O4)
igneous
Moonstone (with Tourmaline/Mica)
Orthoclase/Albite Feldspar (KAlSi3O8 / NaAlSi3O8)
mineral
Citrine Quartz carving
Silicon Dioxide (SiO2)
mineral
Chalcopyrite (Peacock Ore)
Copper Iron Sulfide (CuFeS2)
mineral
Rainbow Moonstone
White Labradorite (Feldspar variety)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Garnet
Pyrope or Almandine (X3Y2(SiO4)3)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Aventurine
Aventurine Quartz (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sunstone
Feldspar (variety Oligoclase or Labradorite), (Ca,Na)(Al,Si)4O8
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with trace Iron (Fe)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Greenschist (or Serpentinite with Manganese Dendrites)
Greenschist facies metamorphic rock
metamorphic
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Marble
Metamorphosed Limestone/Dolomite
metamorphic
Greenish Feldspathic Rock / Epidote Granite (Unakite-type or Epidote-bearing rock)
Epidotized Metamorphic/Igneous Rock
metamorphic
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Metamorphic Rock
Garnet in Matrix
Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Diopside (likely Chromian Diopside)
Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.
mineral
Pyrite (or Arsenopyrite / Ore mineral aggregate)
FeS2 (Iron Sulfide)
mineral
Pyrite or Chalcopyrite
Iron sulfide (FeS2) or Copper iron sulfide (CuFeS2)
mineral
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Corundum (Sapphire in Host Rock)
Corundum (Aluminum Oxide, Al2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Clear or Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Garnet (Spessartine / Almandine)
Fe3Al2(SiO4)3 to Mn3Al2(SiO4)3 (Nesosilicate)
mineral
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Quartz (Milky Quartz / Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Serpentine / Serpentinite
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Quartz (Golden Quartz / Citrine / Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral