Igneous, Metamorphic, Sedimentary

Pebble Gravel Mix (Quartzite, Basalt, Chert)

Alluvial River Gravel / Aggregate Clasts

Rough Quartz (Milky / Clear Quartz)

Silicon Dioxide (SiO2)

Magnetite or Hematite Nodule

Iron Oxide (Fe3O4 or Fe2O3)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Milky Quartz

Silicon Dioxide (SiO2)

Massive White Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz (Milky or Yellow variety)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Magnetite

Iron(II,III) oxide (Fe3O4)

Muscovite

KAl2(AlSi3O10)(OH)2

Quartz

Silicon Dioxide (SiO2)

Gneiss

Metamorphic Gneiss

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite

Iron Pyrite (FeS₂)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

White Quartz (Milky Quartz)

Quartz (Silicon Dioxide - SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Feldspar

Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)

Quartz River Rock

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Point

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz/White Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Specular Hematite

Hematite (Fe2O3)

Citrine

SiO2 (Silicon Dioxide)