Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Red Sandstone (Arkose)
Clastic Sedimentary Rock (Lithic Arkose)
sedimentary
Sandstone (River Cobble)
Sandstone (primarily composed of silica, SiO2)
sedimentary
Diamond
Diamond (pure carbon, C)
mineral
Scoria (Basaltic Lava Rock)
Vesicular Basalt
igneous
Fossilized Megalodon Tooth Fragment
Otodus megalodon (Carcharocles megalodon fossil)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Rounded gray metamorphic cobble, likely quartzite or gneiss
Quartz-rich metamorphic rock; possibly quartzite (mostly SiO₂) or banded gneiss
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Feldspathic Gneiss (Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz Pebble (possibly Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Fossilized Coral
Hexagonaria (Rugose coral) / Calcium Carbonate (CaCO3)
fossil
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Picture Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz Pebble
Quartz (SiO2)
mineral
Green Aventurine
Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Brecciated Chert
Sedimentary Chert (SiO2) with Calc-Silicate mineralization
sedimentary
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Dyed howlite or turquoise imitation
Howlite: Ca₂B₅SiO₉(OH)₅; turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Tumbled yellow jasper or petrified wood fragment
Microcrystalline quartz (chalcedony), SiO₂, possibly iron-oxide-bearing jasper
mineral
Tonsil Stone (Tonsillolith)
Calcium phosphate / Calcium carbonate biomineral
mineral
Blue Lace Agate
Silicon Dioxide (SiO2) with Chalcedony structure
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Botryoidal or Agate nodule)
Silicon Dioxide (SiO2)
mineral
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Tumbled black-and-white stone, likely dalmatian jasper
Quartz-rich porphyritic rhyolite (commercially called dalmatian jasper), with black aegirine/arfvedsonite-like inclusions
igneous
Sandstone
Arenite
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Granite pebble
Granite, chiefly quartz, feldspar, and mica
igneous
Mica Schist
Metamorphic Rock (rich in Muscovite or Biotite mica)
metamorphic
Tumbled greenstone/chlorite-rich pebble
Likely chlorite-rich greenschist or altered basalt; exact identification requires testing
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Feldspar-rich igneous rock, likely granite or gneiss fragment
Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image
igneous
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous