Greenstone Porphyry
Altered Porphyritic Andesite/Basalt
igneous
Category
Metamorphic (Low Grade)
Browse metamorphic (low grade) specimens identified by the Rock Identifier community.
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Gneiss (River Cobble)
Metamorphic Gneiss
metamorphic
Schist
Mica Schist (primarily consisting of muscovite, biotite, and quartz)
metamorphic
Schist
Mica Schist (contains muscovite/biotite and quartz)
metamorphic
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Greenschist / Greenstone
Greenschist facies metabasite
metamorphic
Gneiss (Augen Gneiss)
Augen Gneiss
metamorphic
Rough Diamond
Diamond (C)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Red Scoria (Lava Rock)
Scoria (Vesicular Basalt)
igneous
Green Schist
Greenschist
metamorphic
Iolite-bearing Gneiss (Cordierite)
Cordierite (Mg2Al4Si5O18) in Gneiss matrix
metamorphic
Gneiss
Gneiss
metamorphic
Black Sapphire
Corundum (Al2O3 with iron and titanium impurities)
mineral
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Nuummite
Nuummite (ortho-amphibole rock)
metamorphic
Gneiss
Gneiss
metamorphic
Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)
Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)
mineral
Serpentinite
Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Greenstone / Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Serpentine (New Jade)
Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Serpentine
Serpentine Group (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic