Metamorphic Or Sedimentary Depending On Local Grade

Quartz with Schorl inclusions

Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate Hydroxide (Black Tourmaline)

Alexandrite

Chrysoberyl (BeAl2O4 with Chromium impurities)

Garnet

Almandine-Pyrope group, X3Y2(SiO4)3

Schist

Mica Schist (primarily Muscovite and Quartz)

Granite cobble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Seraphinite

Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8

Schist

Mica Schist

Gray Slate River Stone

Slate

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite inclusions)

Rainbow Moonstone with Black Tourmaline

White Labradorite (Feldspar variety, (Na,Ca)(Al,Si)4O8) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Garnet (Almandine/Pyrope series)

Garnet Group - X3Y2(SiO4)3

Quartz (various varieties)

SiO₂ (Silicon Dioxide)

Amethyst

Quartz (Silicon Dioxide, SiO2) with iron impurities

Native Gold Nugget

Native Gold (Au)

Staurolite (Fairy Cross)

Staurolite (Fe2+2Al9Si4O23(OH))

Slate

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

Quartz (likely Herkimer Diamond style)

Silicon Dioxide (SiO2)

Blue Kyanite in Quartz

Kyanite (Al2SiO5)

Quartzite Pebbler

Quartzite (primarily SiO2)

Sandstone or Mudstone with Iron Staining

Ferruginous Sandstone/Mudstone

Schist (Biotite/Mica Schist)

Medium-grade regional metamorphic rock (rich in Phyllosilicates)

Orange Calcite

Calcium Carbonate (CaCO3)

Dumortierite Quartz

Al7BO3(SiO4)3O3 (Aluminum borate silicate)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Greenstone

Metabasalt (Greenstone)

Greenschist

Greenschist (Chlorite Schist facies)

Greenstone (Metabalt)

Chlorite schist / Altered Basalt

Mica Schist

Mica Schist (Predominantly Muscovite/Biotite)

Slate

Slate

Schist

Mica Schist

Granitic Gneiss

Gneiss (Metamorphic rock of granitic composition)

Nuummite

Antophyllite-Gedrite Orthoamphibole (Mg,Fe)7Si8O22(OH)2

Greenstone

Metabasalt / Chlorite Schist

Banded Gneiss with Quartz Vein

Gneiss (High-grade Regional Metamorphic Rock)

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Celadonite in Basalt (Green Earth)

Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)

Schist

Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])

Epidote in Quartz

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Parti Sapphire

Corundum (Al2O3)

Potassium Feldspar (Orthoclase)

KAlSi3O8 (Potassium Aluminum Silicate)

Smoky Quartz

Silicon Dioxide (SiO2)