Quartz
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
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Grey Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Green Aventurine (or Jadeite/Nephrite Jade)
SiO2 (Silicon Dioxide) - Aventurine Quartz
gemstone
Greenish Feldspathic Rock / Epidote Granite (Unakite-type or Epidote-bearing rock)
Epidotized Metamorphic/Igneous Rock
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Biotite on Quartz
Biotite Mica (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Tumbled Agate
Silicon Dioxide (SiO2)
mineral
Mica Schist fragment
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Granite
Phaneritic plutonic rock (Felsic)
igneous
Rough Ruby
Corundum (Al2O3) with Chromium traces
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Porphyritic Basalt or Andesite
Porphyritic Basalt/Andesite
Igneous
Milky Quartz Cobble
Silicon Dioxide (SiO2)
mineral
Banded Sandstone (River Pebble)
Clastic Sedimentary Rock (SiO2 with impurities)
sedimentary
Amethyst
Quartz (SiO2) with trace iron impurities
Mineral
Biotite (Black Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH)2)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Yellow Jasper
Chalcedony (SiO2) with iron oxide inclusions
mineral
Quartzite (or Milky Quartz pebble)
Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)
metamorphic
Basalt Arrowhead (worked stone)
Aphanitic mafic volcanic rock (Basalt)
igneous
Peridotite
Ultramafic intrusive igneous rock (composition: (Mg, Fe)2SiO4)
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Garnet Schist
Almandine Garnet Schist
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Sodalite
Na8Al6Si6O24Cl2
mineral
Quartzite with Sandstone/Iron staining
Metamorphic Quartzite (SiO2)
metamorphic
Pyrite (on a metal substrate)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Garnet in Schist (Mica Schist with Garnet Inclusion)
Garnetiferous Mica Schist (X3Al2(SiO4)3)
metamorphic
Feldspar (specifically Orthoclase)
Potassium aluminum silicate (KAlSi3O8)
mineral
Quartzite
Metamorphic rock (primarily SiO2)
metamorphic
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral