Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Hematite inclusions

Sandstone

Arenite (composed primarily of SiO2)

Zebra Jasper

Silicon Dioxide (SiO2) with various inclusions

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Sandstone (Yellow/Tan Sandstone)

Arenite (primarily Quartz, SiO2)

Sandstone (likely Arkose)

Arenite (composed mainly of SiO2 with Feldspar)

Clear Quartz

Silicon Dioxide (SiO2)

Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Druzy Quartz Geode (likely Smokey Quartz variety)

Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.

Sandstone

Clastic Sedimentary Rock (composed of SiO2 grains)

Sandstone

Arenite (composed primarily of SiO2)

Ferruginous Sandstone

Sandstone with Iron Oxide (Limonite/Goethite)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 primarily)

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Carnelian (Agate)

SiO2 (Silicon Dioxide with Iron Oxide impurities)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2) matrix

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Geode (Smoky Quartz)

Silicon Dioxide (SiO2)

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Granite)

Shale

Fissile mudstone (rich in clay minerals and quartz)

Sandstone

Arenite

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Mixed Tumbled Stones Collection

Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)

Pebble (likely Quartzite or Chert)

Clastic Sediment, potentially composed of SiO₂ (Quartz)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone (Water-worn Pebble)

Clastic Sedimentary Rock (primarily SiO2)

Quartz Geode Pebble

Silicon Dioxide (SiO2)

Herkimer Diamond

Quartz (Silica - SiO2)

Sandstone (Water-worn Pebble)

Clastic sedimentary rock (primarily SiO2)

Clear Quartz

Silicon Dioxide (SiO2)