Synthetic Glass (Often Categorized As A Simulated Mineral)

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Obsidian

Obsidian (volcanic glass; primarily SiO2)

Mixed Quartz and Jasper Pebbles

Silicon Dioxide (SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Quartz (Clear/White)

Silicon Dioxide (SiO2)

Blue Sapphire

Corundum (Al2O3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Stained with Iron)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Quartz (Smoky or Clear variety with inclusions)

Silicon Dioxide (SiO2)

Chert / Flint

Silicon Dioxide (SiO2)

Chert (Flint Nobule)

Silicon Dioxide (SiO2)

Rose Quartz

SiO2 (Silicon Dioxide with trace inclusions of dumortierite)

Green Aventurine in Host Rock

SiO2 (Quartz with Fuchsite inclusions)

Rose Quartz

Silicon Dioxide (SiO2) with trace Titanium, Manganese or Iron

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Quartz Vein in Host Rock (Gossanous Matrtix)

Silicon Dioxide (SiO2) with iron oxides (Limonite/Hematite)

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)

Silicon Dioxide (SiO2)

Green Slag Glass

Amorphous Silica Glass (Anthropogenic)

Pink Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Milky Quartz (or Bull Quartz)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Quartzite

Quartzite (primarily SiO2)