Pumice
Pumice (Vitreous volcanic rock)
igneous
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Made Glass, Not Natural) in the encyclopedia
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Quartz (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst Cluster
Silicon Dioxide with Iron impurities (SiO2)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Green Quartz (Prasiolite/Adventurine)
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz (Smoky/Milky)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Green Aventurine
Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuscite inclusions
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Sandstone (clastic sedimentary rock composite)
sedimentary
Citrine (Heat-treated Amethyst)
Citrine Quartz (SiO2)
Mineral (Tectosilicate)
Quartz (Gray or Smoky variety)
Silicon Dioxide (SiO2)
mineral
Smooth river pebble
Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert
sedimentary
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Aura Quartz (Titanium or Angel Aura coated)
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Tumbled amethyst
Quartz, crystalline silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Likely quartz fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock
mineral
Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
sedimentary
Green Aventurine
Quartz variety (SiO2 with inclusions of Fuchsite)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Smoky Quartz (Faceted Beads)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Mahogany Obsidian
Volcanic Glass with Hematite or Magnetite (SiO2 + Fe2O3)
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Citrine
Silicon dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary