Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Category
Organic (Non Rock)
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Quartzite
Quartzite (primarily SiO2)
metamorphic
Apache Tears (Tumbled Obsidian)
Volcanic Glass (SiO2 + impurities)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Opalite
Synthetic glass (SiO2 + metal additions)
mineraloid
Quartzite
Quartzite (primarily SiO2)
metamorphic
Amber
Succinate (Fossilized Tree Resin)
fossil
Sea Glass
Amorphous silicon dioxide (man-made glass weathered by nature)
mineral
Sodalite in Feldspar Matrix
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Obsidian (Apache Tears)
Volcanic Glass (Silicic Obsidian)
igneous
Amber
Succinates (Fossilized Resin)
mineral
Quartzite with Glauconitic or Iron staining
Quartzite (SiO2 with accessory minerals)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Arenite (SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Anthracite
Anthracite Coal
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Tektite
Natural impact glass
meteorite
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Jasper-bearing)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Yellow chalcedony (likely citrine or iron-stained quartz)
Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties
mineral
Opalite
Synthetic Glass (typically Silica/Magnesium based with metal additives)
mineral
Barite
Barium sulfate (BaSO4)
mineral
Coal
Bituminous or Anthracite Coal
sedimentary
Blue Goldstone
Aventurine Glass
man-made glass
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Quartzite (Ferruginous)
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 impurities)
metamorphic
Bituminous Coal
Humic coal (Carboniferous fossil fuel)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed sandstone (primarily SiO2)
metamorphic
Coal (Anthracite)
Anthracite (Metamorphosed Coal)
sedimentary
Obsidian
Volcanic Glass (Amorphous silicon dioxide with trace impurities)
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise and Red Coral
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)
mineral