Rock Identifier

Category

Mineral Like (Natural Glass)

Browse mineral like (natural glass) specimens identified by the Rock Identifier community.

Learn about Mineral Like (Natural Glass) in the encyclopedia

Obsidian

Black Obsidian

Macusanite

Baddeleyite

Green Obsidian

Blue Obsidian

Maskelynite

Midnight Obsidian

Sideromelane

Yellow-Green Obsidian

Yellow-Green Obsidian

Perlite

Pink Obsidian

Cullet Glass (Slag Glass) (Amorphous Silicon Dioxide (Industrial byproduct)) — mineraloid

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Amethyst (Silicon Dioxide (SiO2 with iron impurities)) — mineral

Amethyst

Silicon Dioxide (SiO2 with iron impurities)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Tumbled amethyst (Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation) — mineral

Tumbled amethyst

Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation

Sea Glass (Amorphous Silicon Dioxide (Man-made glass weathered by nature)) — mineral

Sea Glass

Amorphous Silicon Dioxide (Man-made glass weathered by nature)

Garnet and Quartz (Pyrope or Almandine (Red Garnets) and Quartz (Center Stone)) — mineral

Garnet and Quartz

Pyrope or Almandine (Red Garnets) and Quartz (Center Stone)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Chlorite/Epidote (Silicon Dioxide (SiO2) with phyllosilicate or sorosilicate inclusions) — mineral

Milky Quartz with Chlorite/Epidote

Silicon Dioxide (SiO2) with phyllosilicate or sorosilicate inclusions

Dyed Agate (Tumbled) (Silicon Dioxide (Chalcedony variety, artificially dyed)) — gemstone

Dyed Agate (Tumbled)

Silicon Dioxide (Chalcedony variety, artificially dyed)

Smoky Quartz with Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz with Milky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Blue Sapphire (Synthetic or Man-made Glass Imitation) (Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic) — mineral

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

Yellow Quartz / Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz / Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Arenite/Quartz Arenite) — sedimentary

Sandstone

Arenite/Quartz Arenite

Smoky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Smoky Quartz

Quartz (Silicon Dioxide, SiO2)

Polished chalcedony (likely sagenite or included agate) (Microcrystalline quartz, SiO₂, with iron-oxide and possibly rutile/goethite inclusions) — gemstone

Polished chalcedony (likely sagenite or included agate)

Microcrystalline quartz, SiO₂, with iron-oxide and possibly rutile/goethite inclusions

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Tumbled yellow quartz (likely citrine or iron-stained quartz) (Quartz, SiO₂; yellow color commonly from iron impurities or irradiation) — mineral

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, SiO₂; yellow color commonly from iron impurities or irradiation

Polished dark stone, likely obsidian (Volcanic glass; primarily SiO₂) — igneous

Polished dark stone, likely obsidian

Volcanic glass; primarily SiO₂

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 predominantly)) — sedimentary

Sandstone

Arenite (SiO2 predominantly)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Obsidian (Volcanic Glass (Amorphous SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous SiO2)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sand and Gravel (Quartz-rich) (Unconsolidated fluvial/beach sediment (primarily Silica/SiO2)) — sedimentary

Sand and Gravel (Quartz-rich)

Unconsolidated fluvial/beach sediment (primarily Silica/SiO2)

Sandstone (Quartzose Sandstone) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Peach Aventurine (Silicon Dioxide (SiO2) with Hematite/Goethite inclusions) — mineral

Peach Aventurine

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Citrine (likely Heat-Treated Amethyst) (Silicon Dioxide (SiO2)) — mineral

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Smoky Quartz (Smoky Quartz (Silicon Dioxide - SiO2)) — mineral

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Opalite (Synthetic Opalized Glass) — gemstone

Opalite

Synthetic Opalized Glass

Polished purple gemstone, likely amethyst (Amethyst: purple quartz, silicon dioxide (SiO₂)) — gemstone

Polished purple gemstone, likely amethyst

Amethyst: purple quartz, silicon dioxide (SiO₂)

Crackle Agate / Dyed Agate (Agate (Silicon dioxide / SiO2)) — mineral

Crackle Agate / Dyed Agate

Agate (Silicon dioxide / SiO2)

Tumbled amethyst (tentative) (Quartz, SiO₂; purple variety colored mainly by iron-related defects and irradiation) — gemstone

Tumbled amethyst (tentative)

Quartz, SiO₂; purple variety colored mainly by iron-related defects and irradiation

Yellow Quartz (Citrine alternative) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Yellow Quartz (Citrine alternative)

Silicon Dioxide (SiO2) with iron impurities

Faceted glass-like gemstone object (Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image) — gemstone

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Tumbled purple chalcedony (likely grape agate) (Chalcedony, cryptocrystalline quartz (SiO₂), with purple manganese-bearing inclusions) — mineral

Tumbled purple chalcedony (likely grape agate)

Chalcedony, cryptocrystalline quartz (SiO₂), with purple manganese-bearing inclusions

Tektite (Indochinite) (Tektite (High-silica natural glass, primarily SiO2 with Al2O3)) — igneous

Tektite (Indochinite)

Tektite (High-silica natural glass, primarily SiO2 with Al2O3)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Green aventurine bead bracelet (Quartz (SiO₂), commonly green quartzite/aventurine colored by fuchsite mica or other inclusions) — mineral

Green aventurine bead bracelet

Quartz (SiO₂), commonly green quartzite/aventurine colored by fuchsite mica or other inclusions