Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Category
Mineral (Extraterrestrial)
Browse mineral (extraterrestrial) specimens identified by the Rock Identifier community.
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Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt
Basalt (with plagioclase or k-feldspar phenocrysts)
igneous
Sandstone (with garnet granules)
Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Blue Goldstone
Aventurine Glass
Man-made mineral simulant (Glass)
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock (Hydrothermal Veined)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Green Garden Quartz (Phantom Quartz)
Silicon Dioxide (SiO2) with Chlorite inclusions
mineral
Earth
Terra / Earth
igneous, sedimentary, and metamorphic
Carnelian
Carnelian (SiO2)
mineral
Mica-rich Schist fragment
Mica Schist
metamorphic
Jasper (var. Ocean or Polychrome Jasper)
Silicon Dioxide (SiO2) with iron and mineral inclusions
sedimentary
Brecciated Chert
Sedimentary Chert (SiO2) with Calc-Silicate mineralization
sedimentary
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Azurite-Malachite (often a mixed specimen)
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.
Mineral
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Vesicular Basalt with Mineral Inclusions
Vesicular Basalt
igneous
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Magnetite (in matrix)
Magnetite (Fe3O4)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)
igneous
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Corundum (Ruby Variety)
Corundum (Al2O3)
mineral
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8), and Mica)
igneous
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Diamond
Diamond (pure carbon, C)
mineral
Granite
Granite
Igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Magnetite
Iron(II,III) oxide (Fe3O4)
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
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Rough Emerald
Emerald (Beryl), Be3Al2(SiO3)6
mineral