Non Geological

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (Stream Pebble)

Arenite (primarily SiO2)

Onyx Marble (Banded Calcite)

Calcite (Calcium Carbonate, CaCO3)

Brown Antique Granite

Anorthosite (Technically a plutonic rock composed mainly of plagioclase feldspar)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Quartz (Smoky/Grey variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Garnet (Pyrope-Almandine series)

Garnet Group, (Mg,Fe)3Al2Si3O12

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

River Pebbles and Quartz

Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Yellow Quartzite

Quartzite (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Gold

Native Gold (Au)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(F,OH)2

Quartz (Iron-stained or Milky)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chert (with possible fossils)

Microcrystalline quartz (SiO2)

Gold Nugget

Native Gold (Au)

Quartz (Milky/Granular)

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Satin Spar (often marketed as Selenite)

Fibrous Gypsum (CaSO4·2H2O)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Granite

Granite (compositional mixture of Quartz, Feldspar, and Mica)

Granite

Granite (Phaneritic igneous rock)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Intrusive igneous rock (Acidic)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)