Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Igneous, Sedimentary, Or Metamorphic (Mineral Based)
Browse igneous, sedimentary, or metamorphic (mineral based) specimens identified by the Rock Identifier community.
Banded Agate
Sedimentary Cryptocrystalline Quartz (SiO2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Sandstone (with banding/weathering)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Quartzite
Quartzite (mostly SiO2)
metamorphic
Greenschist / Chloritaform Schist
Chlorite Schist (Group of Silicate Minerals)
metamorphic
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Corundum
Corundum (Al2O3)
Mineral
Sandstone
Arenite
sedimentary
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Mica Schist
Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)
igneous
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Amethyst and Hematite Bracelet
Amethyst (SiO2) and Hematite (Fe2O3)
mineral
Epidosite (Epidote-rich rock)
Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone
Arenite (SiO2-rich)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Muscovite Mica (on Quartz Matrix)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Muscovite (White Mica)
Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2
Mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Greenstone
Metabasalt / Chlorite-Epidote Schist
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Anthracite Coal
Anthracite (Carbon-based solid)
metamorphic
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral