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)

Muscovite Schist

Metamorphic rock primarily composed of quartz and muscovite mica

Jasper and Epidote in Quartzite

Metamorphic rock containing microcrystalline quartz, epidote, and jasper

Greenschist (Greenstone)

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

Biotite Schist

Metamorphic Rock (Schist with biotite and quartz-feldspar matrix)

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)

Unakite

Epidote-Feldspar rock

Gneiss

High-grade regional metamorphic rock (Foliated Gneiss)

Greenstone (likely serpentinite or chlorite-rich metamorphic rock)

Probable serpentinite/chlorite schist; commonly dominated by serpentine-group minerals, chlorite, talc, and magnetite

Gneiss (with Garnet)

Gneiss (Feldspar-Quartz-Biotite-Garnet Metamorphic Rock)

Slate

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

Lapis Lazuli

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

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

Yellow Aventurine

Silicon Dioxide (Quartz) with inclusions (SiO2)

Pyrite in Slate

Iron Disulfide (FeS2) in Low-grade Metamorphic Rock

Mica Schist

Medium-grade regional metamorphic rock (composition varies)

Gneiss (or Granite Gneiss)

Metamorphic rock rich in quartz, feldspar, and biotite/amphibole

Feldspathic Gneiss

Feldspathic Gneiss (High-grade regional metamorphic rock)

Mica Schist

Schist (muscovite/biotite rich regional metamorphic rock)

Schist (Greenschist / Mica Schist)

Foliated Metamorphic Rock (rich in chlorite, muscovite, and quartz)

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)

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Slate with Red Sandstone Landscaping Rock

Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone

Blue Quartzite

Quartzite (specifically a variety enriched with blue-coloring minerals)

Marble

Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Unakite

Epidote-Feldspar rock (specifically, a variety of granite)

Quartzite

Quartzite

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.