Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Fuchsite (Chrome Mica)
Chromian Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Lepidolite with Tourmaline in Quartz Matrix
K(Li,Al)3(Si,Al)4O10(F,OH)2 (Lepidolite) / SiO2 (Quartz)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Lepidolite on Pegmatite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with Goethite/Limonite cement)
sedimentary
Banded gneiss pebble
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Turquoise
Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O
mineral
Amber
Succinite (fossilized resin)
mineral
Weathered iron-rich sandstone or lateritic rock
Quartz-rich sandstone with iron-oxide/hydroxide cement; possible goethite-bearing laterite
sedimentary
Serpentine (Serpentinite)
Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4
metamorphic
Shale
Fissile Mudrock (Clay-rich Sedimentary Rock)
sedimentary
Jasper and Quartz Breccia
Silica breccia (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Porphyritic Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Rounded gray stone, likely quartz-rich granitic rock
Probable granite or granitic gneiss; mainly quartz, feldspar, and mica
igneous
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Granite / Gneiss Complex
Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)
igneous/metamorphic
Sandstone Pebble (River Rock)
Sandstone (Quartz-rich sedimentary rock with iron oxide staining)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone (Red / Iron-stained)
Sandstone (composed predominantly of SiO2 with Fe2O3 cement)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Calcite / CaCO3)
fossil
Red Sandstone
Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)
sedimentary
Pink Granite
Granite (composed of Potassium Feldspar, Quartz, and Plagioclase)
igneous
Sodalite beads
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with minor lazurite/pyrite or calcite inclusions
mineral
Asphalt Conglomerate
Artificial Bituminous Conglomerate
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Fossilized Shark Tooth (Basal Bone)
Otodus sp. (Mineralized Hydroxyapatite)
sedimentary
Polished mahogany obsidian (probable)
Volcanic glass; chiefly rhyolitic silica-rich glass (SiO₂), compositionally near rhyolite
igneous
Lepidolite on Pegmatite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite
igneous
Basalt (Greenstone/Water-worn Pebble)
Basalt (containing Chlorite/Epidote)
igneous
Sandstone (Arkose/Quartzose)
Arenite (SiO2 based clastic rock)
sedimentary
Shale
Shale (Consolidated fine-grained clay/silt)
sedimentary