Metamorphic (Likely Gneiss Or Schist Based On Texture)

Polished orbicular granite (likely larvikite or orbicular diorite)

Quartz/feldspar-bearing granitoid with dark amphibole–biotite minerals; exact variety requires testing

Greenstone

Metabasalt / Chlorite-Epidote Schist

Unknown Rock Specimen

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Schist

Schist (Crystalline metamorphic rock)

Green Schist

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Garnet Schist

Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)

Raw emerald-bearing beryl (probable)

Beryl, Be₃Al₂Si₆O₁₈; green color from trace chromium and/or vanadium

Gneiss

Gneiss (Foliated Metamorphic Rock)

Quartzite

Quartzite (primarily SiO2)

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Gneiss

Gneiss

Quartz Vein in Schist

Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)

Garnet

Silicate mineral group (often Pyrope or Almandine in this color range)

Greenstone / Greenschist

Chlorite schist / Epidiorite / Metabasalt

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Quartzite Pebble

Quartzite (primarily SiO2)

Mosasaur Tooth

Mosasauridae (likely Prognathodon or Enchodus sp.)

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Greenstone (Metabalt)

Chlorite-actinolite schist (Greenstone)

Weathered quartz-rich rock, likely granite or granitic gneiss

Quartz–feldspar aggregate; probable granite (quartz + K-feldspar/plagioclase with minor mica), stained by iron oxides

Giallo Ornamental Granite

Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Weathered granite or granitic gneiss fragment

Coarse quartz–feldspar–mica aggregate; possibly weakly foliated gneiss

Phyllite

Phyllite

Gneiss

Gneiss

Sandstone (likely Arkosic)

Arenite (SiO2 based)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Orange Calcite

Calcium Carbonate (CaCO3)

Schist

Mica Schist

Biotite Schist

Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)

Quartz-rich granite or granitic pegmatite

Coarse crystalline aggregate of quartz (SiO₂), feldspar, and mica; exact identification is uncertain from the image

River Cobble (Gneiss/Migmatite)

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

Sandstone (likely Conglomerate or Gritstone)

Arenite (SiO2 based)

Garnet Schist

Almandine-Mica Schist

Granite Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss (foliated metamorphic rock)