Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 based)
sedimentary
Granite (Weathered)
Granitic intrusive rock
igneous
Red Sandstone
Arenite (SiO2 based with Fe2O3)
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Green Aventurine
Quartz with Fuchsine inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Pink Granite
Phaneritic Granitoid
igneous
Banded gneiss pebble
Gneiss, chiefly quartz–feldspar–mica with dark biotite/amphibole bands
metamorphic
Sandstone (River Pebble)
Arenite (SiO2 based)
sedimentary
Tumbled porphyritic granite
Granite, primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Tourmaline crystal
Tourmaline Group (Complex Borosilicate)
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Mixed polished gemstone bead lot, likely dyed agate and quartz
Chalcedony (microcrystalline quartz, SiO₂), with possible amethyst, aventurine, and other dyed quartz varieties
gemstone
Granite Gneiss
Felsic Gneiss
metamorphic
Quartz with Mica Schist (Pegmatite Specimen)
SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)
Igneous/Metamorphic Hybrid
River Stone (River Pebble)
Stream-rounded clast (likely Quartzite or Siltstone)
sedimentary
Fuchsite Schist
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
metamorphic
Biotite-bearing granite or granitic gneiss
Quartz–feldspar–biotite aggregate; likely granite, possibly weathered gneiss
igneous
Fuchsite Gneiss (Green Quartzite)
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2 with Cr replacements)
metamorphic
Schist (Chlorite or Mica-rich)
Chlorite Schist
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Emerald in Matrix (Quartz/Schist)
Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities
mineral
Coarse Sandstone
Arenite (SiO2 based)
sedimentary
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Blue Aventurine
Silicon Dioxide (SiO2) with inclusions of Dumortierite
Mineral (silicate variety)
Sandstone
Arenite (SiO2 primarily)
sedimentary
Granite Gneiss or Granitoid River Rock
Granitoid / Gneiss
Metamorphic or Igneous
Yellow Quartz
SiO2 (Crystalline Silicon Dioxide)
mineral
Chert (specifically Jasper/Carnelian Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Dalmatian Jasper
Peralkaline rock with Tourmaline spots
igneous
Mica Schist
Mica Schist (Intermediate-grade Metamorphic Rock)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Emerald
Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Granite or Granitic Gneiss River Rock
Granite / Gneiss
Igneous or Metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Weathered quartz-rich cobble, possibly quartzite or feldspar-rich granite
Quartz–feldspar aggregate; identification is uncertain from the photograph
igneous