Metamorphic (Likely Gneiss Or Schist Based On Texture)

Banded Gneiss River Pebble

Gneiss

Gneiss

Gneiss

Schist

Mica Schist (Foliated Metamorphic Rock)

Granite-like rock

Felsic intrusive igneous rock, likely granite or granodiorite

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Gneiss

Gneiss

Weathered granite or granitic gneiss fragment

Granite; chiefly quartz, alkali feldspar, plagioclase, and minor mica/iron oxides

Unakite Gneiss

Metasomatic Granitoid (variety Unakite)

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Gneiss

Gneiss (Metamorphic rock dominated by Quartz, Feldspar, and various dark minerals)

Gneiss (foliated metamorphic rock)

Gneiss

Muscovite Mica (Golden/Yellow variety)

KAl2(AlSi3O10)(F,OH)2

Likely quartz-rich river pebble

Milky quartz or quartz-bearing granitic/gneissic fragment (SiO₂-dominant)

Biotite Schist

Metamorphic Rock (Schist with biotite and quartz-feldspar matrix)

Banded Quartzite

Quartzite (primarily SiO2)

Quartzite (Aventurine type)

Metamorphosed Quartz Sandstone (SiO2 with inclusions)

Granitic Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Metamorphic Foliated Gneiss

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Foliated Metamorphic Gneiss

Gneiss

Gneissic Metamorphic Rock

Mica Schist with Garnet

Garnetiferous Mica Schist

Gneiss

Gneiss

Unidentified Dark Mineral or Rock

Indeterminate (Likely Silicon Dioxide or Carbon-based)

Quartzite Pebble

Quartzite (primarily SiO2)

Schist with Biotite and Quartz

Biotite-Quartz Schist (Fe,Mg,Al silicate mix)

Green Tourmaline (Verdelite)

Tourmaline Group; often Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) or Dravite (NaMg3Al6(BO3)3Si6O18(OH)4)

Mica Schist / Granite

Mica Schist (Silicate metamorphic rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartzite with Mica Matrix

Metamorphic Quartz-Mica Schist/Quartzite

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

River Pebbles (Mixed Suite)

Mixed lithologies: Quartzite and Gneiss

Polished pink quartzite or jasper

Quartzite, predominantly SiO₂; possibly iron-stained jasper/chalcedony

Pink Feldspar / Rhodochrosite (Tumbled Pink Quartzite)

SiO2 (Quartz) / KAlSi3O8 (Potassium Feldspar)

Sandstone (likely Arkosic or Quartzose)

Arenite (SiO2 based with mineral inclusions)

Quartzite (River Cobble)

Quartzite (mostly SiO2)

Mica Schist

Mica Schist (Composition typically includes Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)

Gneiss

Gneiss

Gneiss (with Quartzite layers)

Gneissic Metamorphic Rock

Mica Schist

Mica Schist (with Muscovite)

Blue Kyanite

Kyanite (Al2SiO5)