Metamorphic Rock

Gneiss

Gneiss (High-grade regional metamorphic rock)

Gray Slate Pebble

Slate (metamorphosed mudstone/shale)

Unakite / Feldspar Veined Metamorphic Pebble

Metamorphic Rock with K-Feldspar, Epidote, and Quartz

Granite Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartzite with Mica / Gneiss Pebble

Metamorphic Rock (Quartz-Feldspar-Mica aggregate)

Quartz-bearing granitic pegmatite (probable)

Mostly quartz (SiO₂) with feldspar and mica; exact minerals uncertain from one image

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Garnet Amphibolite (or Garnet Gneiss)

Garnet amphibolite / Garnet-bearing metamorphic rock

Gneiss (Metamorphic Pebble)

Metamorphic Rock (Quartz-Feldspar-Biotite Gneiss)

Gneiss and Igneous Rock Collection

Foliated Metamorphic Rock (Gneiss) / Igneous Rocks

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Greenstone

Metabasalt / Greenstone (low-grade metamorphic rock)

Gneiss

Metamorphic rock of high-grade regional metamorphism

Gneiss (with Granite/Pegmatite Vein)

Foliated Metamorphic Rock (Quartz-Feldspar Gneiss)

Gneiss (Green Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Likely basalt (possibly weathered volcanic rock)

Basalt; predominantly plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Mica Schist

Mica Schist (Quartz-Mica Metamorphic Rock)

Slate

Foliated Metamorphic Rock (primarily composed of Muscovite, Chlorite, and Quartz)

Schist

Mica Schist (Medium-grade metamorphic rock)

Granite Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Likely weathered basalt or dark metamorphic rock

Fine-grained mafic rock, probably basalt (plagioclase + pyroxene ± olivine)

Quartzite Pebble

Metamorphic rock predominantly composed of Quartz (SiO2)

Grey River Stone (Gneiss/Schist mix)

Foliated Metamorphic Rock (variable mineral formula)

Gneiss (specifically Pink Gneiss)

Gneiss (high-grade regional metamorphic rock)

River Pebble (Quartzite / Sandstone)

SiO2 (Quartz-rich sedimentary/metamorphic rock)

Greenschist / Serpentinite

Metamorphic rock rich in chlorite/actinolite/serpentine

Quartzite

Metamorphic rock predominantly composed of Quartz (SiO2)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Tumbled green-and-white stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and carbonate veins

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartzite

Quartzite (Metamorphic rock primarily composed of SiO2)

Quartzite

Metamorphic rock composed primarily of quartz (SiO2)

Quartzite

Quartzite (Metamorphic rock composed primarily of quartz)

Mica Schist

Metamorphic Rock (rich in Muscovite or Biotite mica)

Quartzite (with inclusions)

SiO2 (Silicon Dioxide) rich Metamorphic Rock

Quartzite Pebble

Metamorphic Rock (mainly Silicon Dioxide, SiO2)

Banded Gneiss

Banded Gneiss (High-grade Metamorphic Rock)

Quartzite Pebble

Metamorphic rock predominantly composed of Quartz (SiO2)