Mica-rich schist
Muscovite–biotite schist, commonly quartz-bearing
metamorphic
Category
Man Made Composite (Lithified Equivalent Of Sedimentary)
Browse man made composite (lithified equivalent of sedimentary) specimens identified by the Rock Identifier community.
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Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
mineral
Sandstone (Pebble)
Sandstone (principally SiO2 with iron oxide impurities)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Black Pearl (Tahitian Type)
Aragonite / Conchiolin composite (CaCO3)
mineraloid
Limestone
Sedimentary rock composed mainly of calcium carbonate (CaCO3)
sedimentary
Vesicular Rhyolite with inclusions
Felsic extrusive igneous rock (Rhyolite)
igneous
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Weathered Sandstone Cobble
Arenite / Quartz Sandstone
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Polished flint/chert pebble
Microcrystalline quartz (SiO₂), commonly called chert or flint
sedimentary
Diamond (or Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Shiva Lingam
Cryptocrystalline Quartz (Jasperiod Silicate with Iron Oxide inclusions)
sedimentary
Ironstone (Limonite/Goethite Concretion)
Ferruginous Sedimentary Rock (composed of Goethite FeO(OH) and Limonite)
sedimentary
Bituminous Coal
Organic Sedimentary Rock (composed mostly of carbon with sulfur and hydrogen)
sedimentary
Sandstone (likely Quartzose Sandstone pebble)
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Gabbro (Water-worn Pebble)
Gabbro
igneous
Basalt River Cobble
Vitreous aphanitic Basalt
igneous
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Rounded basalt pebble
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine
igneous
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Black Opal
Amorphous hydrated silica (SiO2 nH2O)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 with iron oxide inclusions)
sedimentary
Limonite / Brown Iron Ore
Hydrous Iron Oxide (FeO(OH)·nH2O)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Graywacke or Arkose)
Clastic Sedimentary Rock (primarily SiO2 with various lithic fragments)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 enriched)
sedimentary
Banded sandstone pebble
Quartz-rich sandstone (predominantly quartz, with feldspar and iron-oxide cement)
sedimentary
Sandstone (Ferruginous)
Arenite (variable SiO2 with Fe2O3 staining)
sedimentary