Sedimentary Or Metamorphic (Low Grade)

Polished Red Quartz (or Carnelian / Red Jasper)

Silicon Dioxide (SiO2)

Greenschist

Chlorite schist

Greenschist (or Serpentinite) with Quartz-Feldspar Vein

Metabasalt / Greenschist Facies Rock

Quartz and Limestone Grouping

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)

Slate

Foliated Metamorphic Rock (Slate)

Tumbled green epidote–quartz (probable)

Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH), likely intergrown with quartz and/or chlorite

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Slate

Slate (Metamorphic claystone/shale)

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, mica, and chlorite

Red Jasper

Silicon Dioxide (SiO₂)

Weathered metamorphic rock, likely greenschist or amphibolite

Chlorite–actinolite schist/amphibolite; composition likely quartz, feldspar, chlorite, amphibole, and epidote

Epidote or Unakite Rock

Epidote-bearing rock / Ca2(Al,Fe)3(SiO4)3(OH)

Weathered gray metamorphic rock, likely slate or phyllite

Fine-grained foliated metamorphic rock; commonly quartz–mica–chlorite, possibly chlorite phyllite

Pyrite

Iron Disulfide (FeS2)

Greenstone

Metabasalt (composed of chlorite, epidote, and actinolite)

Greenstone

Metabasalt or Greenschist (often contains Chlorite, Actinolite, and Epidote)

Slate

Slate

Purple-gray shale or slate fragment

Argillite/slate, chiefly compacted clay minerals with quartz and mica

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Slate Pebble

Low-grade Metamorphosed Shale (Slate)

Banded gray stone, likely slate or fine-grained metamorphic rock

Probably slate or phyllite; composition commonly mica, quartz, and clay-derived minerals

Lapis Lazuli (Low-grade)

Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)

Epidote

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

Greenstone

Metabasalt

Prehnite with Epidote and Quartz

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Prehnite

Prehnite, Ca2Al2Si3O10(OH)2

Greenstone

Metabasalt / Metavolcanic rock

Greenstone / Greywacke

Metagraywacke (contains Chlorite and Epidote)

Slate

Slate (Foliated metamorphic rock consisting mainly of quartz and muscovite or illite)

Greenstone

Metabasalt / Greenschist facies rock

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Greenstone

Metabasalt / Greenstone (low-grade metamorphic rock)

Pyrite

Iron Sulfide (FeS2)

Slate

Slate (Foliated Metamorphic Rock)

Greenstone / Greenschist

Greenschist (containing Chlorite, Epidote, Actinolite)

Epidote

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

Slate

Metamorphic Pelitic Rock

Dark gray slate (possibly argillite or shale)

Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals

Banded gneiss (polished/tumbled cobble)

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

Slate

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

Greenstone

Chlorite schist / Meta-basalt

Greenstone / Greenschist

Greenschist (composed of Chlorite, Epidote, Actinolite)