Quartz
Silicon Dioxide (SiO2)
mineral
Category
Igneous, Sedimentary, Or Metamorphic (Mineral Based)
Browse igneous, sedimentary, or metamorphic (mineral based) specimens identified by the Rock Identifier community.
Learn about Igneous, Sedimentary, Or Metamorphic (Mineral Based) in the encyclopedia
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Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (primarily Quartz-based Sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Labradorite
Plagioclase Feldspar (Ca,Na)(Al,Si)4O8
mineral
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (composed predominantly of sand-sized grains, 0.0625 to 2 mm)
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Metamorphic or Igneous (context dependent)
Magnetite
Magnetite (Fe3O4)
mineral
Mica (Muscovite)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Quartz (Orange/Pink variety)
Silicon Dioxide (SiO2)
mineral
Epidotite (Unakite-related)
Epidote-rich rock
metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Dalmation Stone (often called Dalmatian Jasper)
Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite
igneous
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Graphite
Graphite (C)
mineral
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Magnetite (Iron Ore)
Iron(II,III) oxide (Fe3O4)
mineral
Greenschist
Chlorite schist
metamorphic
Banded Calcite (Onyx Marble)
Calcite (CaCO3) / Travertine
sedimentary
Quartz (Pink / Ferruginous)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Muscovite Mica in Quartz
Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)
metamorphic
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Rough Green Sapphire (Corundum)
Corundum (Al2O3 - Aluminum Oxide with trace elements)
mineral
Epidote
Ca2(Al, Fe)3(SiO4)3(OH)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Banded gneiss (likely garnet-biotite or quartz-feldspar gneiss)
Gneiss; predominantly quartz (SiO₂), feldspar, and dark biotite/amphibole
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Likely basalt or mafic metamorphic rock
Basalt, predominantly plagioclase feldspar and pyroxene; possibly metamorphosed to amphibolite
igneous
Banded Agate
Sedimentary Cryptocrystalline Quartz (SiO2)
mineral
Sandstone
Arenite
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)