Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
metamorphic
Category
Mineral (Man Made Composite)
Browse mineral (man made composite) specimens identified by the Rock Identifier community.
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Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartzose Sandstone)
sedimentary
Greenstone
Metamorphic mafic rock (chlorite-actinolite-epidote schist)
metamorphic
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Gabbro
Gabbro
igneous
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Blue Slag Glass
Ferro-silicate glass (Slag)
igneous (man-made/industrial)
Granite
Phaneritic Felsic Igneous Rock
igneous
Riverstone (Sandstone Pebble)
Arenite (SiO2 with various lithic fragments)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock
igneous
Likely tumbled epidote-bearing rock or green jasper
Epidote-group silicate, possibly in a jasper or serpentinite matrix
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Nephrite Jade
Nephrite
Mineral/Rock
Sandstone
Arenite (SiO2 based typically)
sedimentary
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
mineral
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Chalcedony (Common Opal or Agate variant)
Silicon dioxide (SiO2) with trace hydration
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary