Serpentinite (likely polished/tumbled)
Serpentinite; chiefly serpentine-group minerals, commonly antigorite, lizardite, and chrysotile, with magnetite and accessory carbonates
metamorphic
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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Greenstone / Greenschist
Chlorite schist / Meta-basalt
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary
Graphite-bearing quartz-mica schist
Graphite-rich quartz–mica schist; primarily quartz (SiO₂), muscovite/biotite, and graphite (C)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
gemstone
Sunstone (Feldspar)
Oligoclase / Labradorite (Plagioclase Feldspar Group, (Na,Ca)Al1-2Si2-3O8)
mineral
Satin Spar (Gypsum)
Gypsum (Satin Spar variety) - CaSO4·2H2O
mineral
Rough Emerald Crystals
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Schist
Schist (containing Quartz, Mica, and Amphibole)
metamorphic
Khondalite
Garnet-sillimanite-graphite schist/gneiss
metamorphic
Anthracite Coal
Anthracite
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Shale
Shale (clastic sedimentary rock)
sedimentary
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Native Sulfur
Sulfur (S8)
mineral
Quartzite
Quartzite (mostly SiO2)
metamorphic
Quartz-rich metamorphic rock, possibly quartzite
Quartzite; primarily crystalline silicon dioxide (SiO₂), with minor feldspar, mica, or iron oxides
metamorphic
Serpentinite
Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)
metamorphic
Shale
Shale (Lutite)
sedimentary
Microcline Feldspar
KAlSi3O8
mineral
Beryl (likely Aquamarine or Heliodor variant)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Garnet
Garnet group (X3Y2(SiO4)3)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Schist (Micaceous)
Mica Schist
metamorphic
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic
Anthracite Coal
Anthracite (a form of coal, primarily carbon)
sedimentary
Tumbled serpentine (likely)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄
metamorphic
Dearest Ring (Gemstones)
Mixed Gemstones: Diamond (C), Emerald (Be3Al2Si6O18), Amethyst (SiO2), Ruby (Al2O3), Sapphire (Al2O3), Topaz (Al2SiO4(F,OH)2)
mineral
Shale
Fissile Mudstone
sedimentary
Yellow Sapphire
Corundum (Al2O3)
gemstone
Marble
Metamorphosed Limestone / Calcite or Dolomite
metamorphic
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Sulfur (on Matrix)
Native Sulfur (S8)
mineral
Sunstone
Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)