Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Category
Igneous, Sedimentary, Or Metamorphic (Mineral Based)
Browse igneous, sedimentary, or metamorphic (mineral based) specimens identified by the Rock Identifier community.
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Sandstone (likely Arkosic)
Arenite (SiO2 based)
sedimentary
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Sandstone River Cobble
Arenite (SiO2 based)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone (with potential iron-oxide weathering)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (specifically Iron-stained Quartz Sandstone)
sedimentary
Mica-rich schist (likely quartz-mica schist)
Quartz–mica schist, commonly containing muscovite and/or biotite with quartz and feldspar
metamorphic
Gneiss (Granitic Gneiss)
Gneiss (from German Gneis, related to 'spark')
metamorphic
Biotite (Black Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH)2)
mineral
Gneiss (with Quartz and Biotite Mica)
Gneiss
metamorphic
Sandstone (Sedimentary Rock)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Weathered dark stone, possibly basalt
Basalt; commonly plagioclase feldspar, pyroxene, and minor olivine
igneous
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Biotite-rich schist (mica schist)
Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH,F)₂), with possible quartz and feldspar
metamorphic
Biotite on Quartz
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)
mineral
Mica Schist
Mica Schist (varies based on mineral makeup, often Biotite/Muscovite schist)
metamorphic
Gneiss
Gneiss
metamorphic
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
mineral
Polished yellow jasper cabochon
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions
metamorphic
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Weathered quartz-rich rock, possibly quartzite
Quartzite (mostly SiO₂), though the photograph is insufficient for confident identification
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Dyed Dalmatian Stone (Dalmatian Jasper)
Aplite (predominantly quartz, feldspar, and arfvedsonite)
igneous
Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Small quartz-rich mineral fragment
Quartz (SiO₂), possibly milky or chalcedonic quartz
mineral
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Sandstone, Quartzite, and River Pebbles
Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures
Sedimentary and Metamorphic
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Hag Stone
Perforated Sedimentary Rock
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Bivalve Fossil (Clam Stone)
Phylum Mollusca, Class Bivalvia
fossil
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Sandstone (with Possible Iron Staining/Crust)
Arenite (SiO2 based)
sedimentary
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral