Non Geological

Quartz Geode

Silicon Dioxide (SiO2)

Fulgurite

Liesegang (Fulgurite)

Petrified Wood (Jet or Coalified Wood appearance)

Silicified wood (principally SiO2) or Carbonized Wood

Petrified Wood

Silicified wood (Quartz/Chalcedony/SiO2)

Chalcopyrite in Quartz (Gossan/Iron Hat)

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

Fossiliferous Kalkstein (Marl/Sandstone)

Fossiliferous calcarenite/siltstone

Fossil Coral

Cnidaria Anthozoa (Fossilized)

Almandine Garnet in Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Blue Diamond

Carbon (C) with trace Boron

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)

Generic Rock / River Pebble

Lithic fragment / Quartzite pebble

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Blue Quartz

Quartz (SiO2) with inclusions

Tumbled Clear Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz arenite)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Rose Quartz or Jasper variety)

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Quartz

Silicon Dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Clastic Sedimentary Rock

Pyrite-bearing Rock

Iron Sulfide (FeS2) associated with host rock

Quartz

Silicon Dioxide (SiO2)

Quartz Crystal Cluster in Matrix

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Yellow Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

White Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)