Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
Learn about Mineral_rock in the encyclopedia
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K-Feldspar (Potassium Feldspar)
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
mineral
Feldspar (Orthoclase)
Potassium Alveolar Silicate (KAlSi3O8)
mineral
Metallic sulfide-bearing rock, possibly galena-rich ore
Likely galena (PbS) with iron sulfides and quartz/rock matrix; exact identification requires testing
mineral
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper and Agate Mix
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Limonite Sandstone
Ferruginous Sandstone (Hydrated Iron Oxide)
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Agate
Silicon dioxide (SiO2)
mineral
Quartz-bearing metamorphic rock, possibly epidote/quartzite
Quartz-rich rock with possible epidote and feldspar; exact identification requires testing
metamorphic
Weathered quartz-rich rock fragment
Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image
mineral
Limonite pseudomorph after pyrite
Goethite / Limonite pseudomorph after Pyrite (Fe3+O(OH) replacing FeS2)
mineral
Raw greenish-blue quartz-bearing mineral specimen
Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests
mineral
Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Staurolite
Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Rock salt (Halite)
Halite (Sodium Chloride, NaCl)
sedimentary
Gneiss (with Quartzite and Mica)
Gneiss
metamorphic
Greenstone
Metamorphic Greenstone (Greenschist facies)
metamorphic
Quartz (Milky or Smoky Quartz variety)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal) Bead
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt with Secondary Minerals
Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Rhodolite Garnet
Mg3Al2(SiO4)3 - Fe3Al2(SiO4)3 (Pyrope-Almandine series)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Spinifex Texture Komatiite
Komatiite (Ultramafic Volcanic Rock)
igneous
Polished white agate or chalcedony bead
Microcrystalline quartz (SiO₂), likely chalcedony/agate with iron-oxide staining or a brown mineral inclusion
gemstone
Sandstone (Weathered / Crushed)
Quartz Sandstone
sedimentary
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral