Clear Quartz
Silicon Dioxide (SiO2)
mineral
Category
Igneous, Sedimentary, Or Metamorphic (Mineral Based)
Browse igneous, sedimentary, or metamorphic (mineral based) specimens identified by the Rock Identifier community.
Learn about Igneous, Sedimentary, Or Metamorphic (Mineral Based) in the encyclopedia
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Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
sedimentary
Biotite-rich schist (likely mica schist)
Mica schist; predominantly quartz, biotite mica, and feldspar
metamorphic
Magnetite Ore
Magnetite (Fe3O4)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone with Tafoni Weathering
Arenite (SiO2 based)
sedimentary
Sandstone (River Pebble)
Arenite (SiO2 based)
sedimentary
Granite
Granite (Phaneritic Igneous Rock)
igneous
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
sedimentary
Weathered quartz-bearing rock, possibly iron-stained quartzite or granitic pegmatite
Indeterminate; likely quartz-rich silicate rock with iron-oxide staining (SiO₂-dominant)
igneous
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Sandstone
Arenite (SiO2 based typically)
sedimentary
Polished banded calcite (often sold as “onyx marble” or Mexican onyx)
Banded calcite, CaCO₃ (sometimes aragonite); decorative “onyx marble” is not true quartz onyx
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Epidote
Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
Mineral
Quartzite (Aventurine type)
Metamorphosed Quartz Sandstone (SiO2 with inclusions)
metamorphic
Tumbled Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Amber (likely a small rough amber piece)
Fossilized plant resin; amber is an organic mineraloid, not a crystalline mineral
gemstone
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Polished blue spotted stone, likely K2 stone
K2 stone: granite containing blue azurite spots; quartz–feldspar–biotite matrix
metamorphic
Red Painted Rock
Artificial Coated Lithic Fragment
sedimentary
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Serafina (Serafinite / Clinochlore)
Clinochlore (Mg5Al)(AlSi3O10)(OH)8
mineral
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Mica-rich rock, likely mica schist
Mica schist, composed chiefly of muscovite and/or biotite with quartz and feldspar
metamorphic
Blue Apatite
Calcium Fluorophosphate - Ca5(PO4)3F
mineral
Gneiss
Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Magnetite
Magnetite (Fe3O4)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic