Granite
Intrusive igneous felsic rock
Category
Browse sedimentary or igneous specimens identified by the Rock Identifier community.
Granite
Intrusive igneous felsic rock
Granite
Granite (a common igneous rock)
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
Quartz with Muscovite Mica
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
Yellow Agate
Silicon Dioxide (SiO2)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Hypersthene
Hypersthene (Magnesium Iron Silicate - (Mg,Fe)SiO3)
Sodalite
Na8(Al6Si6O24)Cl2
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
Feldspar-Quartz Rock (likely Pegmatite or Granite)
Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
Granite
Granite (Felsic Plutonic Rock)
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
Scoria
Vesicular Basaltic Rock
Granite Pebble (River Rock)
Granite (composed primarily of Quartz, Feldspar, and Mica)
Granite
Granite (Felsic Plutonic Rock)
Granite Cobble
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Smoky Quartz
SiO2 (Silicon Dioxide)
Amethyst
Quartz (SiO2) variety
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Shale or Mudstone
Argillaceous sedimentary rock
Pyrite in Shale
Iron Disulfide (FeS2)
Orange Calcite
Calcium Carbonate (CaCO3)
Flesh-toned Siltstone
Siltstone (composed of microscopic Quartz and Feldspar grains)
Granite
Granite (Phaneritic Igneous Rock)
Banded Sandstone (Zebra Stone)
Arenite with Iron Oxide Banding (Liesegang rings)
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
Sodalite
Na8(Al6Si6O24)Cl2
Sandstone
Arenite
Sandstone
Arenite (primarily composed of SiO2)
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
Shale
Fissile Siliciclastic Sedimentary Rock
Rose Quartz
Silicon dioxide (SiO2) with traces of titanium, iron, or manganese
Citrine Quartz
Silicon Dioxide (SiO2)
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)