Sedimentary Rock (Metamorphosed)

White quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite, a metamorphosed quartz sandstone

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Likely greenstone (serpentinized rock)

Serpentinite, predominantly serpentine-group minerals [Mg₃Si₂O₅(OH)₄]

Tumbled greenstone, likely serpentinite

Serpentinite (predominantly serpentine-group minerals: Mg₃Si₂O₅(OH)₄)

Quartzite

Metamorphosed Quartz Sandstone

Likely weathered brown quartz-bearing rock

Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph

Quartzite with Iron Inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

River Pebble (Likely Quartzite or Gneiss)

Metamorphosed Silicate Rock (primarily SiO2)

Quartzite Cobble

Quartzite (SiO2)

Quartzite with Schist layers

Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)

River Stone (likely Quartzite or Sandstone)

Metamorphosed Quartz-rich Rock (SiO2)

Greenstone (Greenstone River Pebble)

Greenschist (metamorphosed mafic igneous rock)

Quartzite with inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (likely Iron-stained)

SiO2 (Metamorphosed Sandstone)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (Pink / Peach)

SiO2 (Metamorphosed Quartz Sandstone)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartz-bearing rock fragment, likely quartz vein in basalt or dark host rock

Quartz (SiO₂) with probable mafic host, possibly basalt or amphibolite

Quartz-rich metamorphic rock, likely quartzite or vein quartz

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica and feldspar

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Weathered amphibolite or mafic metamorphic rock

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar

Coal (Anthracite)

Anthracite (Metamorphosed Coal)

Anthracite Coal

Anthracite (Metamorphosed Coal)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Rounded gray metamorphic cobble, likely quartzite or gneiss

Quartz-rich metamorphic rock; possibly quartzite (mostly SiO₂) or banded gneiss

Green Quartzite (Tumbled)

Metamorphosed Quartz-rich Sandstone

Greenstone (Epidosite)

Epidosite (Metamorphosed Basalt/Diabase)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)