Greenschist
Chlorite schist
metamorphic
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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Foliated slate or phyllite
Fine-grained metamorphosed mudstone; typically quartz, mica, chlorite, and clay-derived minerals
metamorphic
Greenschist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Riverstone (likely Gray Slate or Siltstone)
Metamorphosed fine-grained sedimentary rock (Argillite/Slate)
metamorphic
Slate
Slate (Low-grade regional metamorphic rock)
metamorphic
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Slate
Slate (foliated metamorphic rock)
metamorphic
Slate
Low-grade Metamorphic Rock (composed of quartz, illite, chlorite)
metamorphic
Slate
Foliated metamorphic rock
metamorphic
Banded Slate Pebble
Metamorphosed Mudstone / Slate
metamorphic
Siltstone / Slate
Siltstone / Low-grade Slate
sedimentary
Slate with Pyrite Inclusions
Foliated Metamorphic Rock (with Iron Sulfide FE-S2)
metamorphic
Slate
Slate (foliated metamorphic rock)
metamorphic
Likely weathered sandstone or metasandstone
Quartz-rich sandstone (possibly weakly metamorphosed metasandstone)
sedimentary
Slate
Foliated Metamorphic Rock
metamorphic
Schist (containing Muscovite Mica and Chlorite)
Mica Schist
metamorphic
Foliated metamorphic rock, likely schist
Mica schist or chlorite schist; composition commonly quartz + mica/chlorite ± feldspar
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Green Slate (Greenstone)
Foliated Metamorphic Rock (rich in Chlorite/Epidote)
metamorphic
Weathered iron-rich rock, likely shale or slate
Probably ferruginous shale (iron-oxide-stained mudstone); exact identification requires testing
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Slate
Slate; predominantly fine-grained phyllosilicates, commonly muscovite/illite and chlorite with quartz
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Slate
Slate (Metamorphic Rock)
metamorphic
Biotite Schist
Metamorphic Rock (Schist)
metamorphic
Greenschist
Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)
metamorphic
Banded Slate (Lithified Mudstone)
Low-grade Metamorphosed Mudstone / Slate
metamorphic
Pyrite in Slate
Iron Disulfide (FeS2) in Low-grade Metamorphic Rock
metamorphic
Slate
Foliated metamorphic rock (Slate)
metamorphic
Banded gneiss pebble
Gneiss, typically quartz–feldspar–mica assemblage
metamorphic
Likely blue-gray slate
Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Grey Slate
Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Greenschist
Greenschist (composed mainly of actinolite/tremolite, chlorite, and epidote)
metamorphic
Anthracite Coal
Anthracite (Metamorphic/High-grade Coal)
sedimentary
Carnelian
SiO2 (Silicon Dioxide with Iron Oxide impurities)
gemstone
Slate with Iron Staining
Low-grade Metamorphic Mudstone (Slate)
metamorphic
Gray slate or fine-grained metamorphic rock
Slate–phyllite spectrum; predominantly fine-grained quartz, mica, and chlorite
metamorphic
Greenstone (Greywacke or Nephrite Jade variant)
Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)
metamorphic
Likely slate fragment
Slate; predominantly fine-grained mica/clay minerals and quartz
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral