Mixed (Sedimentary, Igneous, And Metamorphic)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Amethyst and Hematite Bracelet

Amethyst (SiO2) and Hematite (Fe2O3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Unidentified Rock Fragment

Unknown

Pyrite

Iron Disulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Water and Silt (Sedimentary Environment)

Suspended Sediment / H2O (dihydrogen monoxide)

Tumbled Moonstone and Amazonite Chips

Orthoclase (KAlSi3O8) and Microcline (KAlSi3O8) of the Feldspar Group

Banded Gneiss

Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)

Gneiss

Gneiss

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)

Schist

Mica Schist (Variable chemistry, often rich in muscovite and biotite)

Gneiss (specifically a Banded Gneiss cobble)

Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz Crystal

Quartz (SiO₂)

Citrine

Citrine (Silicon Dioxide - SiO2)

Gneiss

Gneiss

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss (Schistose)

Gneiss

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss (specifically Pink Gneiss)

Gneiss (high-grade regional metamorphic rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Pyrite (Iron Pyrite)

Iron Sulfide (FeS2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Fluorite

Calcium Fluoride (CaF2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)

River Cobble (Gneiss/Migmatite)

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

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

Gneiss

Gneiss

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)