Igneous, Sedimentary, Metamorphic

Pyrite

Iron Disulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Mixed Mineral Collection

Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky/Crystalline fragment)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartzite with Mica / Gneiss Pebble

Metamorphic Rock (Quartz-Feldspar-Mica aggregate)

Magnetite

Magnetite (Iron(II,III) oxide, Fe3O4)

Graphite

Graphite (C)

Magnetite (Iron Ore)

Iron(II,III) oxide (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Gneiss

Metamorphic Gneiss

Milky Quartz in Matrix

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Magnetite

Magnetite (Fe3O4)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Orange Quartz / Peach Aventurine

Silicon Dioxide (SiO2)

Magnetite / Lodestone

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Magnetite / Hematite mix

Magnetite (Fe3O4) and Hematite (Fe2O3)

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)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

White Quartz (Milky Quartz)

Quartz (Silicon Dioxide - SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite

Iron Pyrite (FeS₂)

Gneiss

Metamorphic Gneiss

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)