Metamorphic (Low Grade)

Epidote in Matrix (Dragon Stone variant)

Epidote with Quartz/Feldspar (Ca2(Al,Fe)3(SiO4)3(OH))

Slate

Slate (foliated metamorphic rock)

Jadeite

NaAlSi2O6 (Sodium Aluminum Silicate)

Greenstone

Greenschist (containing chlorite, epidote, and actinolite)

Greenstone

Metabasalt / Metamorphosed Igneous Rock

Slate

Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)

Serpentine (likely serpentinite)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly with magnetite and carbonate

Slate

Slate (Foliated Metamorphic Rock)

Anthracite Coal

Anthracite (Carbon rank grade)

Schist (containing Muscovite Mica and Chlorite)

Mica Schist

Pyrite in Slate

Iron Disulfide (FeS2) in Low-grade Metamorphic Rock

Quartz on Chlorite Schist

Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)

Gold in Quartz Ore

Hydrothermal Quartz with native Gold (Au)

Serpentine (Serpentinite)

Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)

Slate

Slate; predominantly fine-grained phyllosilicates (muscovite/illite, chlorite) with quartz and feldspar

Slate

Slate; fine-grained foliated metamorphic rock, chiefly quartz, mica, and clay minerals

Prehnite

Ca2Al(AlSi3O10)(OH)2

Wavellite

Wavellite (Al3(PO4)2(OH, F)3·5H2O)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Epidote

Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Anthracite Coal

Anthracite (Metamorphic/High-grade Coal)

Epidotite (Unakite-related Epidote)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Greenstone (likely serpentinite or altered basalt)

Serpentinite, chiefly serpentine-group minerals; possibly chlorite- or actinolite-bearing greenschist

Slate with Fossiliferous Impressions

Metamorphosed Argillaceous Rock (Fossiliferous Slate)

Slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate–phyllite; predominantly quartz, mica, and chlorite

Greenstone (Epidosite)

Epidosite (Metamorphosed Basalt/Diabase)

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Greenstone

Greenschist / Meta-basalt

Green Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

Greenstone

Greenschist (primarily composed of chlorite, actinolite, and epidote)

Layered dark metamorphic rock, likely slate or phyllite

Slate/phyllite; predominantly fine-grained quartz, mica, and chlorite

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of clay-derived mica minerals and quartz

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Greenstone

Metabasalt / Greenschist

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Likely slate fragment

Slate; predominantly fine-grained mica/clay minerals and quartz

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; commonly quartz, muscovite/illite, chlorite, and graphite or carbonaceous matter

Greenstone / Greenschist

Greenschist facies metamorphic rock (composed primarily of chlorite, actinolite, and epidote)

Jadeite

Jadeite (NaAlSi2O6)

Ruby in Zoisite (Anyolite) or possibly a dyed stone/agate

Anyolite (Ruby in green zoisite) or artificially altered chalcedony

Greenschist

Greenschist (comprising Actinolite, Chlorite, and Epidote)