Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Category
Mineral (Biogenic)
Browse mineral (biogenic) specimens identified by the Rock Identifier community.
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Diorite
Diorite (an intrusive igneous rock)
igneous
Diorite
Phaneritic Intermediate Plutonic Rock
igneous
Granitic Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Vesicular Basalt with Xenocrysts
Mafic Igneous Plutonic/Extrusive Complex
igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Basalt
Mafic Igneous Rock
igneous
Milky Quartz (Water-Worn Pebble)
Silicon Dioxide (SiO2)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Clear Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Agate
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Rhodolite Garnet
Mg3Al2(SiO4)3 - Fe3Al2(SiO4)3 (Pyrope-Almandine series)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Green Quartz (Prasiolite/Adventurine)
Silicon Dioxide with inclusions (SiO2)
mineral
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Bornite
Bornite (Cu5FeS4)
mineral
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Sandstone (with Siltstone/Greywacke variations)
Sedimentary Rock (Clastic)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Amber
Succinite (fossilized tree resin), C10H16O
Organic Gemstone
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Eagle Eye / Grey Tiger Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Mineral
Gneiss
Gneiss
metamorphic
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Mica Schist
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Basalt
Mafic Extrusive Igneous Rock
Igneous