Sedimentary And Igneous (Mixed)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Rose or Milky Quartz)

Silicon Dioxide (SiO2)

Beach Pebble (Quartz / Quartzite)

Silicon Dioxide (SiO2)

Gneiss

Metamorphic Foliated Gneiss

Banded Agate (Dyed / Polished)

Microcrystalline Quartz (SiO2)

Green Fluorite

Calcium Fluoride (CaF2)

Magnetite

Magnetite (Fe3O4)

Banded Agate (specifically Eye Agate)

Chalcedony (Silicon Dioxide, SiO2)

Carnelian Agate

Chalcedony (SiO2 with Iron Oxides)

Quartz (Crystal)

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Milky Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (Metamorphic Rock)

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Quartz Crystal

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Gneiss

Pyrite (Fool's Gold) in Matrix

Iron Disulfide (FeS2)

Pyrite-bearing Rock

Iron Sulfide (FeS2)

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Hematite (likely Botryoidal or Specularite variant)

Iron(III) oxide (Fe2O3)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Greenschist

Chlorite schist

Pyrite

Iron Disulfide (FeS2)