Metamorphic (Low Grade)

Ruby (Corundum)

Corundum (Aluminum Oxide) with chromium trace elements, Al2O3

Nephrite Jade

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

Milky Quartz with Chlorite/Moss Infusions

Silicon Dioxide (SiO2)

Anthracite Coal

Anthracite (Carbon-based sedimentary-derived metamorphic rock)

Schist (specifically Chlorite/Greenschist)

Chlorite Schist

Epidote

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

Greenstone (Rough Jadeite or Nephrite)

Sodium aluminum silicate (Jadeite) / Calcium magnesium iron silicate (Nephrite)

Green Schist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Lapis Lazuli

Lapis Lazuli (Complex silicate: Na8[Al6Si6O24]Sn)

Raw Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Anthracite Coal

Anthracite (Carbon)

Banded Slate or Siltstone with Quartz/Calcite Veins

Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Jadeite

NaAlSi2O6; Jadeite silicate mineral

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2 (Actinolite-Tremolite series)

Serpentinite

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

Khondalite

Garnet-Sillimanite-Graphite Gneiss

Serpentinite

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile, Mg3Si2O5(OH)4)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Greenstone / Graywacke

Metagraywacke (Chlorite-grade schistose rock)

Jadeite

Jadeite (NaAlSi2O6)

Quartzite pebble

Crystalline silica (SiO2)

Schist (Garnet-Mica Schist)

Garnet-Mica Schist

Rough Ruby (Corundum) in Zoisite Matrix

Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Greenstone / Greenschist

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

Banded Iron Formation (BIF) / Tiger Iron

Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Anthracite Coal

Anthracite (Carbon)

Unidentified River Rock or Mudstone

N/A (Generic rock fragment)

River Quartzite Pebble

Quartzite (primarily SiO2)

Schist

Schist (various mineral compositions)

Epidote

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

Greenstone / Greenstone Pebble

Greenschist (metamorphosed basalt or gabbro)

Anthracite Coal

Anthracite

Mixed Mineral Collection (with Quartz, Beryl, and host rock)

Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Ruby (Corundum)

Aluminium oxide (Al2O3) with Chromium traces

Nephrite Jade

Nephrite (a variety of the Calcium magnesium iron silicate mineral series Actinolite), Ca2(Mg, Fe)5Si8O22(OH)2

Blue Kyanite

Kyanite (Al2SiO5)