Grey River Stone (Quartz-rich Quartzite/Siltstone)
Quartzite / Meta-siltstone (primarily SiO2)
Metamorphic (low-grade)
Category
Metamorphic (Low Grade)
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Greenstone (possibly Basalt or Greenschist)
Greenschist (composed primarily of chlorite, actinolite, and epidote)
Metamorphic (low-grade)
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Slate
Low-grade Metamorphic Rock
metamorphic
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Greenschist
Chlorite schist
metamorphic
Green Slate (Greenstone)
Metamorphic shale (varied composition)
metamorphic
Slate
Slate (Low-grade regional metamorphic rock)
metamorphic
Slate with Pyrite Inclusions
Foliated Metamorphic Rock (with Iron Sulfide FE-S2)
metamorphic
Slate
Low-grade Metamorphic Rock (composed of quartz, illite, chlorite)
metamorphic
Slate
Slate (foliated metamorphic rock)
metamorphic
Slate
Foliated metamorphic rock
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Greenschist
Greenschist (Major minerals include Chlorite, Actinolite, and Epidote)
metamorphic
Greenstone / Greenschist
Greenschist (composed of chlorite, epidote, and actinolite)
metamorphic
Greenschist
Chlorite schist
metamorphic
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Slate
Slate
metamorphic
Slate
Slate (Low-grade foliated metamorphic rock)
metamorphic
Greenstone (Greenschist)
Greenschist facies rock (containing chlorite, actinolite, and epidote)
metamorphic
Slate
Phyllo-silicate based metamorphic rock
metamorphic
Greenstone
Greenschist / Meta-basalt
metamorphic
Seraphinite (Clinochlore)
Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8
mineral
Greenschist
Chlorite schist
metamorphic
Greenschist
Greenschist
metamorphic
Greenstone
Metabasalt
metamorphic
Greenstone
Greenschist (composed of actinolite, chlorite, and epidote)
metamorphic
Greenstone / Greenschist
Greenschist facies metamorphic rock
metamorphic
Greenstone / Greenschist
Greenschist (containing Chlorite, Epidote, Actinolite)
metamorphic
Greenstone
Metabasalt or Greenschist (often contains Chlorite, Actinolite, and Epidote)
metamorphic
Slate
Slate
metamorphic
Slate with Iron Staining
Low-grade Metamorphic Mudstone (Slate)
metamorphic
Zoisite with Hornblende
Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions
metamorphic
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Slate
Slate (foliated metamorphic rock)
metamorphic
Garnet
Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic