Diamond Drill Core (Greenschist and Quartzite)
Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)
metamorphic
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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Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Granitic Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, K-feldspar, and plagioclase)
metamorphic
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Schist
Mica Schist (Metamorphic rock)
metamorphic
Epidote-bearing Rock / Epidote Inclusion
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
River Stone (likely Quartzite or Limestone)
Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)
metamorphic
Gneiss
Granitic Gneiss
metamorphic
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Gneiss (Hornblende/Biotite Gneiss)
Foliated Metamorphic Rock (Quartz-Feldspar-Amphibole/Mica matrix)
metamorphic
Biotite Mica
K(Mg, Fe)3AlSi3O10(F, OH)2
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Mica / Muscovite or Biotite
Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)
mineral
Gneiss
Metamorphic Gneiss
metamorphic
Greenschist
Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)
metamorphic
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Clear quartz sphere or polished quartz cabochon (tentative)
Quartz, silicon dioxide (SiO₂); appearance may also be consistent with ordinary glass, which cannot be ruled out from the image alone
gemstone
Gneiss
Gneiss (SiO2-rich metamorphic rock)
metamorphic
Blue Quartzite
Quartzite (silicon dioxide, SiO2)
metamorphic
Chalcedony (Agate/Jasper mix)
Cryptocrystalline Sillimanite (Quartz) - SiO2
mineral
Dendritic sandstone
Sandstone with Manganese Oxide dendrites
sedimentary
Epidote with Quartz
Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)
mineral
Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)
Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)
metamorphic
Biotite Schist
Biotite-rich Schist
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Gneiss (or Granite Gneiss)
Metamorphic rock rich in quartz, feldspar, and biotite/amphibole
metamorphic
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Generic Rock Fragment
Rock Fragment
sedimentary
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Granite Gneiss
Granitoid Gneiss
metamorphic
Yellow Aventurine
Silicon Dioxide (Quartz with inclusions), SiO2
mineral
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic