Sedimentary Or Metamorphic (Low Grade)

Slate

Foliated Metamorphic Slate

Slate

Slate (Metamorphic Rock)

Biotite-rich gneiss

Foliated quartz–feldspar–mica gneiss; mainly quartz, plagioclase/alkali feldspar, and biotite

Milky quartz-rich rock

Quartz, SiO₂; possibly quartzite or massive vein quartz

Black Onyx

Silicon Dioxide (SiO2) - Chalcedony variety

Greenstone (Altered Mafic Rock)

Greenschist / Meta-basalt

Greenstone (Epidosite or Altered Basalt)

Epidosite (Ca2(Al, Fe)3(SiO4)3(OH))

Greenstone (Greenstone River Pebble)

Greenschist (metamorphosed mafic igneous rock)

Greenstone

Metabasalt (Greenstone Facies)

Red Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Jadeite Jade

NaAl(Si2O6)

Greenstone / Graywacke

Metagraywacke or Chlorite Schist

Jasper pebble

Silicon Dioxide (SiO2) with iron oxide impurities

Greenstone / Greenschist

Chlorite schist / Epidiorite / Metabasalt

Greenschist / Serpentinite Cobble

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

Greenstone

Greenschist facies metabasite

Greenschist

Chlorite-actinolite schist

Greenstone

Metabasalt / Greenschist

Greenstone

Greenschist

Greenstone

Protolith: Basaltic rock

Slate

Slate (foliated metamorphic rock rich in quartz, sericite, and chlorite)

Slate

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

Greenstone

Greenschist (commonly containing Chlorite, Actinolite, and Epidote)

Greenstone / Metabasalt

Metamorphosed Mafic Rock (Greenschist facies)

Slate

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

Greenstone

Greenschist (composed of chlorite, actinolite, and epidote)

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Gray slate

Slate; fine-grained foliated metamorphic rock composed mainly of mica and quartz

Rough Sapphire (possibly Yellow/Green Corundum)

Corundum (Al2O3)

Foliated metamorphic rock, likely slate or phyllite

Slate–phyllite; composition commonly quartz, mica, and chlorite

Weathered metamorphic rock, likely schist or slate

Foliated pelitic metamorphic rock; commonly muscovite–chlorite schist or phyllite

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Banded Slate (Sedimentary Pebble)

Slate (Metamorphosed Shale or Mudstone)

Gossan (Iron Hat)

Goethite-Hematite rich weathered rock (Fe-hydroxides)

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Greenstone / Greenschist

Chlorite schist / Epidiorite

Pyrite (Limonite Pseudo-morph after Pyrite)

Iron sulfide (FeS2) transitioning to Iron oxide-hydroxide (FeO(OH)·nH2O)