Quartzite
Quartzite (chiefly SiO2)
metamorphic
Category
Organic (Non Rock)
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Quartzite
Quartzite (SiO2)
metamorphic
Amber
Succinates
mineraloid
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Fulgurite
Lechatelierite (Fused Silica)
mineral
Tektite (Indochinite)
Tektite (Terrestrial Impact Glass)
meteorite
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Conglomerate
Conglomerate / Lithic Wacke
sedimentary
Green Opal
Opal (Hydrated silica, SiO2·nH2O)
mineral
Green Sea Glass
Man-made vitreous material (silica glass)
gemstone
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Anthracite Coal
Anthracite
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Snowflake Obsidian
Obsidian with Cristobalite inclusions (mostly amorphous SiO2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Arenite
metamorphic
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Yellow Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Obsidian (Polished Point/Wand)
Volcanic Glass (SiO2 with impurities)
igneous
Siltstone
Siltstone (primarily SiO2 with various silicates)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
River Quartzite Pebble
Quartzite (SiO2)
metamorphic
Snowflake Obsidian
Volcanic Glass with Spherulitic Cristobalite Inclusion
igneous
Black Obsidian
Obsidian (Volcanic Glass, ~70% SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Green Quartzite
Metamorphic Quartz Sandstone (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Freshwater Pearl
Aragonite / Biogenic Calcium Carbonate (CaCO3)
mineral
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Gold Sheen Obsidian
Volcanic Glass (SiO2 with inclusions)
igneous