Sandstone
Arenite (SiO2 based typically)
sedimentary
Category
Mineral (Man Made Composite)
Browse mineral (man made composite) specimens identified by the Rock Identifier community.
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Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Yellow chalcedony (likely polished/tumbled pieces)
Microcrystalline quartz, SiO₂; commonly called yellow jasper or silicified limestone depending on exact texture
mineral
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
mineral
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Polished black stone sphere (likely black basalt or black tourmaline)
Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone
igneous
Sandstone
Arenite
sedimentary
Likely tumbled epidote-bearing rock or green jasper
Epidote-group silicate, possibly in a jasper or serpentinite matrix
mineral
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Red-and-white jasper/chalcedony pebble
Microcrystalline quartz (SiO₂), likely hematite- or iron-oxide-bearing jasper with white chalcedony/quartz
mineral
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Chrysocolla in Malachite
Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Banded calcite (likely polished limestone/marble fragment)
Calcite, CaCO₃; probable banded calcitic marble
metamorphic
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Polished rutilated quartz cabochon
Quartz (SiO₂) with rutile inclusions (TiO₂)
gemstone
Rounded granite cobble
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Common Opal or Agate variant)
Silicon dioxide (SiO2) with trace hydration
mineral
Tumbled chalcedony (likely milky quartz)
Microcrystalline quartz, SiO₂; possibly pale agate or quartzite
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Chert (likely flint)
Microcrystalline quartz, SiO₂
sedimentary
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Polished granite egg
Granite, chiefly quartz, feldspar, and dark mica or amphibole
igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Raw quartz crystal pendant
Quartz (silicon dioxide, SiO₂), likely milky or cloudy quartz
mineral
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material