Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Category
Non Geological
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Quartzite
Quartzite (Metamorphosed Quartz Sandstone)
metamorphic
White Marble
Metamorphic carbonate rock (primarily CaCO3)
metamorphic
Anthracite Coal
Anthracite
sedimentary
Mahogany Obsidian
Volcanic Glass with Hematite or Magnetite (SiO2 + Fe2O3)
igneous
Amber
Succinite (Resinite)
fossil
Snowflake Obsidian
Spherulitic Obsidian (Amorphous Volcanic Glass with Cristobalite inclusions)
igneous
Quartzite Pebble
Meta-quartzite
metamorphic
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Anthracite Coal
Anthracite
metamorphic
Obsidian
Volcanic glass (SiO2 + impurities)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Amber (Cherry Amber)
Succinite (C10H16O)
Organic Gemstone
Anthracite Coal
Anthracite
metamorphic
Barite
Barium Sulfate (BaSO4)
mineral
Pumice
Pumice (Amorphous volcanic glass)
igneous
Basalt (River Rock)
Basalt (Mafic volcanic rock)
igneous
Obsidian (Apache Tear)
Amorphous Volcanic Glass (SiO2 + impurities)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Anthracite Coal
Anthracite C
metamorphic
Apache Tear
Obsidian (Volcanic Glass), SiO2 + MgO, Fe3O4
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Breccia
Clastic Breccia (SiO2/CaCO3 dominated)
sedimentary
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Tektite (Indochinite)
Tektite (natural glass, SiO2 + Al2O3)
mineral
Apache Tear (Obsidian)
Volcanic glass (SiO2 - Silicon Dioxide)
igneous
Faceted Glass (Costume Jewelry)
Amorphous Silicon Dioxide with colorants (Glass)
Synthetic/Man-made Material
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite/Magnetite inclusions)
igneous
Tektite (Indochinite)
Impactite (Natural Glass)
meteorite
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Pebble
Quartzite
metamorphic
Quartzite Cobble
Meta-quartzite (SiO2)
metamorphic
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Siltstone
Siltstone
sedimentary
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Black Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic