Mixed (Sedimentary, Igneous, And Metamorphic)

Citrine

Silicon Dioxide (Quartz variety), SiO2

White Quartz

Silicon Dioxide (SiO2)

Quartz pebble / Quartzite

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hematite

Iron Oxide (Fe2O3)

Hematite

Iron Oxide (Fe2O3)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Rainbow Hematite Ring

Iron(III) oxide (Fe2O3) with thin-film coating

White Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite in Matrix (likely Quartz or Schist matrix)

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Calcite

Calcite (Calcium Carbonate - CaCO3)

Quartz

Silicon dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Quartz

Silicon Dioxide (SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Quartz Crystal Fragment

Quartz (Silicon Dioxide, SiO2)

Apatite

Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

White Zircon

Zircon (Zirconium silicate, ZrSiO4)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Blue Apatite

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

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky or Citrine-tinted)

Silicon Dioxide (SiO2)

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)