Crystal

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Green Quartz

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2)

Amethyst on Agate

Crystalline Quartz (SiO2) with trace Iron (Fe3+)

Calcite crystal cluster

Calcite (calcium carbonate, CaCO₃), likely honey or pale-orange calcite

Rough quartz crystal, possibly smoky quartz

Quartz (silicon dioxide, SiO₂)

Quartz Crystal Cluster / Quartzite

Silicon Dioxide (SiO2)

Rock Crystal Quartz Bead

Silicon Dioxide (SiO2)

Faceted Quartz (Rock Crystal)

Crystalline Silicon Dioxide (SiO2)

Quartz (Crystal Cluster)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace impurities

Quartz Crystal Cluster (with Selenite Satin Spar)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz crystal cluster

Quartz, silicon dioxide (SiO₂), likely milky or partially included rock crystal

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Dyed Quartz Crystal

Silicon Dioxide (SiO2) with artificial pigment

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Smoky quartz crystal (probable)

Quartz, silicon dioxide (SiO₂), likely iron-colored smoky quartz

Quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

Honey calcite crystal

Calcite (calcium carbonate, CaCO₃)

Calcite crystal cluster

Calcite (calcium carbonate, CaCO₃), likely honey or amber calcite

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Quartz Crystal (Amethyst)

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Raw greenish-blue quartz-bearing mineral specimen

Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests

Druzy Quartz on Sandstone

Silicon Dioxide (SiO2) on Sedimentary Host Rock

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Amethyst Geode

Quartz (SiO2)

Crackled Quartz (Blue Dyed)

Silicon Dioxide (SiO2) with anthropogenic dye

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Clear Quartz (Crystal Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)