Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Category
Mineral (Tectosilicate)
Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.
Learn about Mineral (Tectosilicate) in the encyclopedia
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Bumblebee Jasper
Fibrous Calcite with Arsenic and Sulfur inclusions
mineral
Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone (with garnet granules)
Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)
sedimentary
Porphyritic Basalt
Basalt (with plagioclase or k-feldspar phenocrysts)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Blue Goldstone
Aventurine Glass
Man-made mineral simulant (Glass)
Sandstone
Arenite (primarily SiO2)
sedimentary
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock (Hydrothermal Veined)
igneous
Green Garden Quartz (Phantom Quartz)
Silicon Dioxide (SiO2) with Chlorite inclusions
mineral
Earth
Terra / Earth
igneous, sedimentary, and metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Mica-rich Schist fragment
Mica Schist
metamorphic
Carnelian
Carnelian (SiO2)
mineral
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8), and Mica)
igneous
Chromite
Chromite (FeCr2O4)
mineral
Corundum (Ruby Variety)
Corundum (Al2O3)
mineral
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)
igneous
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Limonite/Goethite Gossan
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Mica (specimen appears to be Muscovite or Phlogopite)
Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2
Mineral (Found in Igneous and Metamorphic rocks)
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Smoky Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Rough Emerald
Emerald (Beryl), Be3Al2(SiO3)6
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Selenite (Satin Spar)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Chrysocolla
Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Amygdaloidal Basalt with Epidote
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Tumbled Stones (various)
Mixed Silica-based Minerals (primarily Quartz and Chalcedony)
mineral
Pearl
Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)
mineral
Ocean Jasper
Silicon Dioxide (SiO2) with iron and other mineral inclusions
mineral