Metamorphic Rock

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)

Unakite

Epidote-Feldspar rock

River Cobble (Gneiss/Migmatite)

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

Marble

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

Blue Quartzite

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

Yellow Aventurine

Silicon Dioxide (Quartz) with inclusions (SiO2)

Marble

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

Tiger's Eye

Silicon Dioxide with Crocidolite (SiO2)

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Gneiss

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

Lapis Lazuli

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

Anthracite Coal

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

Slate

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

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)

Banded Gneiss (River Rock/Pebble)

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

Quartzite

Quartzite

Unakite

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

Serpentine

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

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.

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite)

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Banded Iron Formation

Banded Iron Formation (BIF)

Banded Gneiss (Variety of Gneiss)

Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)

Soapstone

Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Quartzite

Quartzite

Greisen (Quartz-Muscovite-Turretine Rock)

Greisen

Gneiss

Gneiss (pronounced 'nice')

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Bloodstone

Heliotrope (a variety of Chalcedony, SiO₂ with inclusions)

Serpentine

Serpentinite (rock) containing serpentine minerals (e.g., Antigorite, Lizardite, Chrysotile)

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Banded Gneiss

Gneiss (pronounced "nice")

Tiger's Eye

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

Gneiss

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

Banded Gneiss

Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)