Igneous, Sedimentary, Metamorphic, Mineral

Quartz Mineral

Silicon Dioxide (SiO2)

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Golden Calcite

Calcium Carbonate (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Honey Calcite

Calcium Carbonate (CaCO3)

Magnetite / Ironstone Pebble

Magnetite (Fe3O4)

Blue Calcite

Calcium Carbonate (CaCO3)

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Gneiss

Metamorphic Foliated Gneiss

Quartz fragment (Pebble)

Silicon Dioxide (SiO2)

Bornite

Bornite (Cu5FeS4)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Blue Apatite

Apatite group (Ca5(PO4)3(F,Cl,OH))

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Quartzite with Mica / Gneiss Pebble

Metamorphic Rock (Quartz-Feldspar-Mica aggregate)

Pyrite

Iron Disulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Pyrite (FeS2)

Garnet in Matrix

Almandine or Pyrope Garnet (X3Y2(SiO4)3) in Schist or Eclogite matrix

Quartz

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Garnet

Garnet (X3Y2(SiO4)3)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Tumbled Mixed Gemstones and Rocks

Various mineral species including quartz (SiO2) and silicate minerals

Gneiss (Banded Gneiss Cobble)

Gneiss

Kaolinite (Kaolin)

Kaolinite (Al2Si2O5(OH)4)

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled quartz-rich stone, likely milky quartz

Quartz (SiO₂), possibly iron-stained milky quartz or quartzite

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

SiO2

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)