Sedimentary Or Metamorphic (Low Grade)

Greenstone (Metabalt)

Chlorite schist / Altered Basalt

Slate

Slate

Jadeite Jade

Jadeite (NaAlSi2O6)

Epidote

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

Actinolite

Ca2(Mg,Fe)5Si8O22(OH)2

Slate

Slate; fine-grained metamorphosed shale, commonly composed of quartz, illite/muscovite, and chlorite

Weathered quartz-rich pebble, likely sandstone or quartzite

Quartzite (SiO₂), possibly ferruginous sandstone

Green Schist

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Nephrite Jade / Greenstone

Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]

Greenschist / Greenstone

Greenschist (composed of chlorite, epidote, actinolite, albite)

Slate

Foliated Metamorphic Rock (primarily clay minerals and micas)

Slate River Stone

Foliated Metamorphic Rock (composed of illite, chlorite, and quartz)

Greenstone

Greenschist / Greenstone (containing Chlorite, Epidote, Actinolite)

Banded gneiss

Gneiss; typically quartz–feldspar–mica assemblage

Greenstone / Glauconitic Siltstone

Metabasalt or Glauconite-rich Sedimentary Rock

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Blue Kyanite

Kyanite (Al2SiO5)

Slate

Slate (Metamorphic silicate rock)

Slate

Slate (Foliated metamorphic rock)

Argillite (with Barnacles)

Argillite (metamorphosed mudstone/shale)

Greenschist

Greenschist (containing Chlorite, Actinolite, and Epidote)

Likely chlorite-bearing schist (possibly greenschist)

Chlorite–quartz–mica schist; commonly contains muscovite/biotite and feldspar

Greenschist

Greenschist (Chlorite-actinolite schist)

Anthracite Coal

Anthracite (Metamorphic/High-grade Sedimentary Coal)

Weathered greenstone

Metamorphosed mafic rock, commonly chlorite–actinolite schist or altered basalt

Slate

Metamorphic Pelitic Rock

Picasso Jasper (Picasso Stone)

Metamorphosed Calcium Carbonate (Silicified Limestone)

Brecciated Jasper (Polished)

Silicon Dioxide (SiO2) with Iron Oxide Impurities

Prehnite

Ca2Al(AlSi3O10)(OH)2

Prehnite

Ca2Al(AlSi3O10)(OH)2

Fuchsite

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)

Hard Sandstone (Quartzite)

Quartz-rich Sedimentary Rock (Proto-Quartzite)

Quartz-rich pegmatitic rock, probably granitic gneiss

Quartz–feldspar–mica gneiss; locally pegmatitic granite

Chlorite-rich schist (probable greenschist)

Chlorite–quartz–mica schist; commonly derived from basalt or shale under greenschist-facies metamorphism

Slate

Slate; predominantly fine-grained mica- and clay-mineral rock, commonly derived from shale

Garnet-Bearing Gneiss

Garnetiferous Feldspathic Gneiss

Greenstone / Greenschist

Greenschist (metamorphosed mafic rock)

Weathered metamorphic rock, likely chlorite schist or greenstone

Chlorite-rich schist/greenschist; exact identification requires testing

Greenstone or Metabasalt

Metabasalt / Chlorite Schist

Greenstone

Metabasalt / Chlorite Schist

Likely graphite-rich metamorphic rock (graphitic schist)

Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides

Black shale or slate fragment

Carbonaceous shale; possibly low-grade slate (clay minerals, quartz, carbon/graphite)