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

Citrine (Tumbled Quartz) (Silicon Dioxide (SiO2)) — mineral

Citrine (Tumbled Quartz)

Silicon Dioxide (SiO2)

Tektite (Impactite (Natural Silicate Glass)) — meteorite

Tektite

Impactite (Natural Silicate Glass)

Sandstone (likely Conglomerate or Gritstone) (Arenite (SiO2 based)) — sedimentary

Sandstone (likely Conglomerate or Gritstone)

Arenite (SiO2 based)

Opalite (Man-made Glass) (Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)) — Synthetic Mineral Simulant / Glass

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Synthetic Mineral Simulant / Glass

Opalite (Synthetic glass (Opalite simulant)) — gemstone

Opalite

Synthetic glass (Opalite simulant)

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

Prasiolite

Silicon Dioxide (SiO2) with iron impurities

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

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Clear quartz crystal (Quartz (silicon dioxide, SiO₂)) — mineral

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Possibly tumbled black stone (uncertain; may be black glass or obsidian) (Undetermined; possible obsidian (natural volcanic glass, predominantly SiO₂)) — mineral

Possibly tumbled black stone (uncertain; may be black glass or obsidian)

Undetermined; possible obsidian (natural volcanic glass, predominantly SiO₂)

Tumbled blue glass-like specimen, possibly dyed chalcedony or synthetic glass (Uncertain; possible dyed quartz/chalcedony (SiO₂), but appearance strongly suggests cobalt-blue glass) — mineral

Tumbled blue glass-like specimen, possibly dyed chalcedony or synthetic glass

Uncertain; possible dyed quartz/chalcedony (SiO₂), but appearance strongly suggests cobalt-blue glass

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Citrinated Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrinated Quartz)

Silicon Dioxide (SiO2)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Amethyst on Basalt Matrix (Crystalline Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst on Basalt Matrix

Crystalline Silicon Dioxide (SiO2) with iron impurities

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Black Obsidian (Obsidian (Volcanic Glass, SiO2 + impurities)) — igneous

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Raw Citrine (Citrine (Silicon Dioxide, SiO2)) — mineral

Raw Citrine

Citrine (Silicon Dioxide, SiO2)

Milky Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Moldavite (Tektite (Natural Silica Glass)) — meteorite

Moldavite

Tektite (Natural Silica Glass)

Chert (Banded) (Cryptocrystalline Silica (SiO2)) — sedimentary

Chert (Banded)

Cryptocrystalline Silica (SiO2)

Obsidian (Volcanic Glass (Amorphous silicon dioxide with impurities)) — igneous

Obsidian

Volcanic Glass (Amorphous silicon dioxide with impurities)

Green glass-like mineral specimen, likely fluorite (Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass) — mineral

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

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

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

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

Amethyst (Tumbled Quarz)

Silicon Dioxide (SiO2) with iron impurities

Opalite-style pendant (likely synthetic glass, not natural opal) (Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)) — gemstone

Opalite-style pendant (likely synthetic glass, not natural opal)

Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)

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

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Green glass sphere/marble (Soda-lime glass (primarily SiO2, Na2O, CaO)) — Man-made object (Simulant)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Man-made object (Simulant)

Sandstone (Arenite (primarily Quartz Arenite)) — sedimentary

Sandstone

Arenite (primarily Quartz Arenite)

Opalite Egg (Synthetic Glass (Simulated Opal)) — mineral

Opalite Egg

Synthetic Glass (Simulated Opal)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Chert Concretion (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert Concretion (Flint)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Blue opalite glass cabochon (likely imitation opal) (Man-made opalescent glass; not a natural mineral) — gemstone

Blue opalite glass cabochon (likely imitation opal)

Man-made opalescent glass; not a natural mineral

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Sandstone (Sedimentary rock composed mainly of quartz and feldspar) — sedimentary

Sandstone

Sedimentary rock composed mainly of quartz and feldspar

Yellow Quartz (Rough) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Rough)

Silicon Dioxide (SiO2)

Blue tumbled glass-like specimen; likely blue slag glass (Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image) — mineral

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image