Sedimentary And Igneous

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Quartz Crystal Point

Silicon Dioxide (SiO2)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Blue Chalcedony

Silicon Dioxide (SiO2)

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Dalmatian Jasper

Peralkaline Quartz-Feldspar Porphyritic Rock (Dalmatian Stone)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Boulder

Silicon Dioxide (SiO2)

Raw Quartz

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Graphite

Graphite (Carbon, C)

Yellow Quartz (Citrine / Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz (Smoky Quartz / Chalcedony)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Granite Gneiss

Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)

Quartz Pebble

Silicon Dioxide (SiO2) Pebble

Gneiss

Metamorphic Gneiss

Milky Quartz

SiO2 (Silicon Dioxide)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Biotite Schist

Biotite-rich Schist

Magnetite (Lodestone)

Magnetite (Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Common Quartz/Citrine-toned)

Silicon Dioxide (SiO2)

Pyrite

Iron Pyrite (FeS2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Black Onyx

Silicon Dioxide (SiO2) - Chalcedony variety

Quartz

Silicon Dioxide (SiO2)

Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)