Metamorphic Rock

Anthracite Coal

Anthracite (Carbon-based sedimentary-metamorphic rock)

Green Slate (Greenstone)

Foliated Metamorphic Rock (rich in Chlorite/Epidote)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Feldspathic Gneiss (Granite Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz (pebble)

Quartz (SiO₂)

Slate with Quartz Vein

Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)

Lapis Lazuli

Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Slate with Pyrite Inclusions

Foliated Metamorphic Rock (with Iron Sulfide FE-S2)

Slate River Stone

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

Greenschist (Greenstone)

Greenschist (Metamorphic rock containing chlorite, actinolite, and epidote)

Quartzite Pebble

Metamorphic rock primarily composed of Silicon Dioxide (SiO2)

Slate

Foliated Metamorphic Rock (primarily clay minerals and micas)

River Pebble (Gneiss or Quartzite)

Metamorphic rock specimen (likely Gneiss or impure Quartzite)

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Slate

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

Anthracite Coal

Anthracite (Carbon-based sedimentary-derived metamorphic rock)

Mica Schist

Medium-grade regional metamorphic rock (composition varies)

Feldspathic Gneiss

Feldspathic Gneiss (High-grade regional metamorphic rock)

Pyrite in Slate

Iron Disulfide (FeS2) in Low-grade Metamorphic Rock

Shungite

Non-crystalline carbon (high-carbon metamorphic rock)

Anthracite Coal

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Banded Gneiss

Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)

Coal (Anthracite)

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Slate

Metamorphosed Shale (Fine-grained Foliated Metamorphic Rock)

Greenschist (Chlorite Schist)

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

Schist (Biotite/Mica Schist)

Medium-grade regional metamorphic rock (rich in Phyllosilicates)

Slate with Red Sandstone Landscaping Rock

Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone

Lapis Lazuli

Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

Wishing Stone with Quartz Veins

Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)

Banded River Rock / Gneiss (highly weathered)

Gneiss

Granitoid Gneiss with Feldspar Vein

Gneiss (High-grade Metamorphic Rock) with Potassium Feldspar (KAlSi3O8)

Unakite

Unakite (Epidote-Feldspar rock)

Mica Schist

Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)

Slate

Foliated Metamorphic Rock (composed mainly of clay minerals or micas)

Ruby in Zoisite

Anyolite (composite of Corundum and Zoisite)

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

Slate

Low-grade Metamorphic Rock (composed of quartz, illite, chlorite)