Manufactured Stone

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite (Sugar Quartz)

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Chert (variations include Flint/Jasper)

Cryptocrystalline Silicon Dioxide (SiO2)

Basalt

Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Basalt

Extrusive Igneous Rock

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Smoky Quartz with possible inclusion

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Siltstone Pebble

Siltstone (primarily SiO2 with Al2O3)

Milky Quartz on Matrix

Silicon Dioxide (SiO2)

Sand and Gravel (Quartz-rich)

Unconsolidated fluvial/beach sediment (primarily Silica/SiO2)

Sandstone

Arenite (mainly SiO2 with varying cements)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (primarily SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Red Sandstone

Arenite (Ferruginous Sandstone)

Gold Nugget

Native Gold (Au)

Quartz pebble

Silicon Dioxide (SiO2)

Olivine in Basalt

Peridotite / Forsterite ((Mg,Fe)2SiO4)

Vesicular Basalt (River Rock)

Afanitic Vesicular Basalt

Sandstone (likely Quartz Sandstone)

Arenite (composed primarily of SiO2)

Quartz Pebble (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Quartz

Silicon Dioxide (SiO2)

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Bicolor Quartz (Milk Quartz with Slag or Dark Inclusions)

Silicon Dioxide (SiO2) with impurities

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Lepidolite

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

Obsidian

Volcanic Glass (predominantly SiO2, approximately 70% or more)