Red Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
Learn about Synthetic Glass in the encyclopedia
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Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Chert (v. Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Agate (Chalcedony), SiO2
Mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Tektite (Indochinite)
Tektite (High-silica natural glass)
meteorite
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sand Grain (Quartz)
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Moldavite
Moldavite (Silica Glass with impurities)
tektite
Obsidian (Apache Tear)
Amorphous Volcanic Glass (SiO2)
igneous
Pumice
Pumicite (Amorphous Volcanic Glass)
Igneous
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Fulgurite
Lechatelierite
mineral
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Pink Quartzite
Quartzite (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2 silicon dioxide)
metamorphic
Green Aventurine
Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Pebble
Metamorphic Rock (chiefly Silicon Dioxide, SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral