Sedimentary Or Metamorphic (Low Grade)

Anthracite Coal

Anthracite (Carbon Content: 86%-97%)

Mica Schist

Foliated Metamorphic Rock (Schist)

Epidosite

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

Serpentinite

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

Schist

Mica Schist (primarily Muscovite and Biotite)

Nephrite Jade

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

Ruby (Corundum)

Corundum (Aluminum Oxide) with chromium trace elements, Al2O3

Greenschist

Greenschist (chlorite-epidote schist)

Quartzite Pebbles

Quartzite (primarily SiO2)

Milky Quartz with Chlorite/Moss Infusions

Silicon Dioxide (SiO2)

Epidote

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

Serpentinite (often containing Jadeite/Nephrite)

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

Limonite Concretion

Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O

Ferruginous Sandstone

Arenite with Iron-Oxide cement (Fe2O3 · nH2O)

Jadeite (Jade)

Jadeite (NaAlSi2O6)

Jadeite Jade

Sodium Aluminum Silicate (NaAlSi2O6)

Emerald In Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Limonite Concretion

Limonite (FeO(OH)·nH2O)

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Green Schist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Anthracite Coal

Anthracite (Carbon)

Conglomerate

Conglomerate (clastic sedimentary rock)

Ferruginous Sandstone (Ironstone Conglomerate fragments)

Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)

Limonite Pseudomorph after Pyrite

Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Greenstone (Rough Jadeite or Nephrite)

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

Raw Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Rough Ruby (Corundum) in Zoisite Matrix

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

Schist

Schist (various mineral compositions)

Greenstone / Greenstone Pebble

Greenschist (metamorphosed basalt or gabbro)

Schist (Garnet-Mica Schist)

Garnet-Mica Schist

Lapis Lazuli

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

Jadeite

Jadeite (NaAlSi2O6)

Banded Iron Formation (BIF) / Tiger Iron

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

Anthracite Coal

Anthracite (Carbon)

Serpentinite

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

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Epidote in Granite Gneiss

Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))

Stiped Slate Beach Pebble

Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)