Metamorphic Rock

Schist (Biotite/Mica Schist)

Medium-grade regional metamorphic rock (rich in Phyllosilicates)

Slate with Pyrite Inclusions

Foliated Metamorphic Rock (with Iron Sulfide FE-S2)

Greenschist (Greenstone)

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

Slate

Foliated Metamorphic Rock (primarily clay minerals and micas)

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Anthracite Coal

Anthracite (Carbon-based sedimentary-derived metamorphic rock)

Slate with Red Sandstone Landscaping Rock

Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone

Wishing Stone with Quartz Veins

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

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

Mica Schist

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

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Slate

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

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

Slate

Foliated Metamorphic Rock (composed mainly of Quartz, Illite, and Chlorite)

Anthracite Coal

Anthracite (Carbon-based metamorphic rock, 86-97% C)

Granite Gneiss

High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)

Diamond Drill Core (Greenschist and Quartzite)

Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)

Gneiss

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

Greenschist

Chlorite schist (Metamorphic rock dominated by chlorite, epidote, and actinolite)

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

Slate (foliated metamorphic rock rich in quartz, sericite, and chlorite)

Slate

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

Slate

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

Banded River Rock / Gneiss (highly weathered)

Gneiss

Unakite

Unakite (Epidote-Feldspar rock)

Gneiss

Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)

Tiger's Eye

Silicon dioxide with crocidolite fibers (SiO2 with chrysotile amphibole inclusions)

Granite / Gneiss Complex

Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)

Blue Quartzite

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

Slate

Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)

Marble

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

Slate

Slate (Regional metamorphic rock composed primarily of quartz, illite, and chlorite)

Banded Gneiss (River Rock/Pebble)

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

Unakite

Epidote-Feldspar rock

Marble

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

Quartzite

Quartzite

Yellow Aventurine

Silicon Dioxide (Quartz) with inclusions (SiO2)

Calcite

Calcite (CaCO3)

Serpentine

Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)