Clear Quartz
Silicon Dioxide (SiO2)
mineral
Category
Minerals
Browse minerals specimens identified by the Rock Identifier community.
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Granite
Phaneritic Igneous Rock (Granite)
igneous
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive)
igneous
Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Specular Hematite
Hematite (Fe2O3)
mineral
Quartz Pebble
Crystalline Silica (SiO2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium aluminum silicate)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Tan)
Silicon Dioxide (SiO2)
mineral
Olivine-bearing Basalt / Scoria
Mafic Igneous Rock (primarily (Mg, Fe)2SiO4)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Chert
Chert (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Cobble (River Rock)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy variety)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
mineral
Quartz Pebble (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Gastropod Fossil (Snail Internal Mold)
Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Andesite Porphyry (Geological Drill Core)
Andesite Porphyry
igneous
Sand Tiger Shark Tooth (Fossil)
Carcharias taurus (fossilized dentin/enameloid)
fossil
Fossilized Sand Tiger Shark Tooth
Carcharias sp. (likely Carcharias taurus or Striatolamia)
fossil
Chert (within Limestone)
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Hornblende inclusions
mineral
Orthoceras Fossil
Orthoceras regulare (Extinct Cephalopod)
fossil
Iron-stained Quartzite
Metamorphosed Quartz (SiO2) with Hematite/Limonite impurities
metamorphic
Chert (Chalcedony/Agate variety)
Silicon dioxide (SiO2)
sedimentary
Chert (Nodular)
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Obsidian (Volcanic glass, primarily SiO2)
igneous
Petrified Wood
Silicified Wood (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Chert (White-Tan variety)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Ferruginous Quartz
Iron-stained Quartz (SiO2 with Fe2O3 impurities)
mineral