Quartz Pebble
Silicon Dioxide (SiO2)
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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Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Gneiss (Hornblende/Biotite Gneiss)
Foliated Metamorphic Rock (Quartz-Feldspar-Amphibole/Mica matrix)
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Epidote-bearing Rock / Epidote Inclusion
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock
mineral
Generic Rock Fragment
Rock Fragment
sedimentary
Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)
Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)
metamorphic
Epidote with Quartz
Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)
mineral
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
River Stone (likely Quartzite or Limestone)
Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)
metamorphic
Clear quartz crystal (likely quartz fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Chalcedony (Agate/Jasper mix)
Cryptocrystalline Sillimanite (Quartz) - SiO2
mineral
Coarse Sandstone
Arenite (SiO2 based)
sedimentary
Greenschist
Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)
metamorphic
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Unidentified Rock
Unknown
sedimentary
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Granite Gneiss
Granitoid Gneiss
metamorphic
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Dark Agate / Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based sedimentary rock)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Iron-stained weathered rock
Unknown
Unknown (likely sedimentary or metamorphic)
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Red)
Arenite (primarily Quartz, SiO2, with Iron Oxide cement)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Gneiss (or Granite Gneiss)
Metamorphic rock rich in quartz, feldspar, and biotite/amphibole
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary