Mixed (Predominantly Sedimentary And Igneous)

Yellow Quartz Pebble (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz

SiO₂ (Silicon Dioxide)

Labradorite (tumbled)

Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Quartz River Pebbles

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)

Arkosic Sandstone

Arkose

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

Chalcedony (Agate/Chert)

Silicon Dioxide (SiO₂)

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

Quartz (Milky/Cloudy Variety)

Silicon Dioxide (SiO2)

Gneiss (with Quartz and Mica)

Gneiss

Green Schist

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

Pyrite

Iron Disulfide (FeS2)

Carnelian

Carnelian (Microcrystalline Quartz, SiO2)

Yellow Quartz (Citrine Quartz or Yellow Chalcedony)

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Metamorphic rock of high-grade regional metamorphism

Biotite (Mica)

Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)

Hematite

Iron (III) Oxide, Fe2O3

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

Biotite Schist

Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Hematite

Iron(III) oxide (Fe2O3)

Gneiss

Gneiss (Metamorphic high-grade)

Quartz (Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Carnelian (Orange Chalcedony)

Silicon Dioxide (SiO2)

Gneiss (River Cobble)

Gneiss (Foliated Metamorphic Rock)

Banded Agate

Chalcedony (Silicon Dioxide, SiO2)

Blue Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions

Moonstone

Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)