Metamorphic Or Sedimentary

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

Mica Schist with Iron Staining

Muscovite/Biotite Schist

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Quartzite

Quartzite (Silicon Dioxide, SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Cobble

Quartzite (composed primarily of SiO2)

Quartzite River Stone

Metamorphosed Quartz-rich Sandstone (SiO2)

Quartzite (or Iron-Stained Quartz Pebble)

Silicon Dioxide (SiO2) with Ferric Oxide inclusions

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Gneiss

High-grade foliated metamorphic rock

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss

Gneiss (High-grade metamorphic rock)

River Pebbles (Mixed Lithology)

Conglomerate clasts (Silica-rich and Metamorphic assemblages)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Garnet Schist

Almandine-Garnet Mica Schist

Epidote

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

Gneiss

Gneiss

Gneiss (Banded Gneiss)

Gneiss

Anthracite Coal

Anthracite (Carbon Content: 86%–98%)

Gneiss

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

Anthracite Coal

Anthracite

Gneiss (with Quartz and Biotite Mica)

Gneiss

Banded Gneiss

Gneiss

Schist (specifically Mica Schist)

Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)

Muscovite Schist

KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix

Gneiss

Gneiss

Quartzite

Quartzite (SiO2)

Garnet Gneiss

Gneiss containing almandine-pyrope garnet

Gneiss

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

Green Aventurine

Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)

Gneiss

Gneiss

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Red Garnet (likely Almandine or Pyrope)

Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Garnet-bearing Schist

Almandine Garnet [Fe3Al2(SiO4)3] in Micaceous Schist

Gneiss

Gneiss

Gneiss

Gneiss

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions