Metamorphic (Low Grade)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Greenschist (Chlorite Schist)

Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)

Ruby

Corundum (Al2O3 with Chromium traces)

Green Schist

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

Greenstone / Graywacke

Metagraywacke or Chlorite Schist

Anthracite Coal with Sulfur staining

Anthracite (Carbon C with impurities)

Greenschist (Greenstone River Pebble)

Greenschist (Chlorite Schist)

Serpentinite

Serpentinite (Hydrated Magnesium Silicate Mg3Si2O5(OH)4)

Quartzite with Chlorite

Metamorphic Quartzite (SiO2) with phyllosilicates

Prase quartz with actinolite inclusions

Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Nephrite Jade

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

Jadeite

Jadeite (NaAlSi2O6)

Fuchsite

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)

Jadeite (Jade)

Jadeite; NaAlSi2O6

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Pyrite

Iron Sulfide (FeS2)

Anthracite Coal

Anthracite

Epidote with Quartz and Feldspar

Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)

Greenstone Celt (Polished Stone Axe)

Metamorphosed mafic rock (often Basalt or Diabase)

Jadeite Jade

Jadeite (NaAlSi2O6)

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Mica Schist

Foliated Metamorphic Rock (Schist)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Epidote with Magnetite/Hematite inclusions

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

Schist

Mica Schist (primarily Muscovite and Biotite)

Pyrite

Iron Disulfide (FeS2)

Epidosite

Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Gossan (Iron Hat)

Limonitic Gossan (Fe-oxide/hydroxide complex)

Emerald In Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Ferruginous Sandstone

Clastic Sedimentary Rock (Iron-rich)

Jadeite (Jade)

Jadeite (NaAlSi2O6)

Serpentinite (often containing Jadeite/Nephrite)

Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4

Jadeite Jade

Sodium Aluminum Silicate (NaAlSi2O6)

Pyrite

Iron Sulfide (FeS2)

Greenschist

Greenschist (chlorite-epidote schist)

Greenstone / Glauconitic Siltstone

Metabasalt or Glauconite-rich Sedimentary Rock