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

Crackle Glass (Simulated Gemstone) (Amorphous Solid (SiO2)) — man-made glass

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Sandstone (Arenite (SiO2 with various cementing agents)) — sedimentary

Sandstone

Arenite (SiO2 with various cementing agents)

Tektite (Natural impact glass) — meteorite

Tektite

Natural impact glass

Man-made Glass (Tumbled/Shaped) (Amorphous Silicon Dioxide (SiO2) with metal oxide colorants) — Mineraloid (synthetic)

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Mineraloid (synthetic)

Blue opalite (often sold as synthetic opal) (Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)) — gemstone

Blue opalite (often sold as synthetic opal)

Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)

Opalite (Synthetic Glass / Man-made Opal Simulant) — gemstone

Opalite

Synthetic Glass / Man-made Opal Simulant

Blue glass-like tumbled specimen (Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image) — mineral

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Black tumbled stone, possibly obsidian (Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image) — igneous

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Sandstone (Arenite (SiO2 based clastic rock)) — sedimentary

Sandstone

Arenite (SiO2 based clastic rock)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Green sea glass or green glass-like tumbled material (Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral) — mineral

Green sea glass or green glass-like tumbled material

Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral

Blue-green slag glass or chalcedony-like material (Likely industrial glassy slag; exact identification requires testing) — mineral

Blue-green slag glass or chalcedony-like material

Likely industrial glassy slag; exact identification requires testing

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Opalite (Synthetically produced glass (Silicon Dioxide with metallic inclusions)) — Mineraloid (Man-made Glass)

Opalite

Synthetically produced glass (Silicon Dioxide with metallic inclusions)

Mineraloid (Man-made Glass)

Green sea glass (likely) (Anthropogenic glass, not a mineral; composition commonly soda–lime silicate glass) — mineral

Green sea glass (likely)

Anthropogenic glass, not a mineral; composition commonly soda–lime silicate glass

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Obsidian (Obsidian (principally SiO2 - Silicon Dioxide)) — igneous

Obsidian

Obsidian (principally SiO2 - Silicon Dioxide)

Smoky Quartz (Silicon Dioxide (SiO2) with trace aluminum and irradiation) — mineral

Smoky Quartz

Silicon Dioxide (SiO2) with trace aluminum and irradiation

Aura Quartz (Titanium/Rainbow Quartz) (SiO2 (Silicon Dioxide) with metallic coating) — mineral

Aura Quartz (Titanium/Rainbow Quartz)

SiO2 (Silicon Dioxide) with metallic coating

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Quartz with Epidote (Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate [Ca2(Al,Fe)3(SiO4)3(OH)]) — metamorphic

Quartz with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate [Ca2(Al,Fe)3(SiO4)3(OH)]

Citrine (tumbled) (Silicon dioxide, SiO2) — mineral

Citrine (tumbled)

Silicon dioxide, SiO2

Sandstone (with vugs or solution cavities) (Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)) — sedimentary

Sandstone (with vugs or solution cavities)

Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)

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

Yellow Quartz / Citrine Quartz

Silicon Dioxide (SiO2)

Goldstone (likely red/brown aventurine glass) (Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)) — mineral

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Goldstone (Man-made glass infused with copper particles) — gemstone

Goldstone

Man-made glass infused with copper particles

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Blue opalescent glass-like gemstone (possibly imitation opalite) (Likely man-made opalite glass; composition varies, typically silica-based glass) — gemstone

Blue opalescent glass-like gemstone (possibly imitation opalite)

Likely man-made opalite glass; composition varies, typically silica-based glass

Sandstone (Sedimentary rock composed mainly of sand-sized minerals or rock grains) — sedimentary

Sandstone

Sedimentary rock composed mainly of sand-sized minerals or rock grains

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Opalite (a synthetic glass) (Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant) — Mineral Simulant (Synthetic Glass)

Opalite (a synthetic glass)

Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant

Mineral Simulant (Synthetic Glass)

Tumbled Yellow Quartz (Golden Quartz / Citrine) (Silicon Dioxide (SiO2)) — mineral

Tumbled Yellow Quartz (Golden Quartz / Citrine)

Silicon Dioxide (SiO2)

Blue Goldstone (Aventurine Glass (Silicon Dioxide with metal inclusions)) — man-made glass mineral simulant

Blue Goldstone

Aventurine Glass (Silicon Dioxide with metal inclusions)

man-made glass mineral simulant

Sandstone (River Cobble) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2)

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

Quartz (Smoky Quartz)

Silicon Dioxide (SiO2)

Snowflake Obsidian (Volcanic Glass with Cristobalite inclusions (SiO2)) — igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (SiO2)

Cubic Zirconia (Zirconium Dioxide (ZrO2)) — mineral

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Green sea glass (likely slag glass or bottle glass) (Man-made soda-lime silicate glass; not a naturally occurring mineral) — mineral

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Snowflake Obsidian (Volcanic Glass (SiO2 rich with Cristobalite inclusions)) — igneous

Snowflake Obsidian

Volcanic Glass (SiO2 rich with Cristobalite inclusions)

Amethyst (Silicon Dioxide (SiO2)) — mineral

Amethyst

Silicon Dioxide (SiO2)

Goldstone (brown goldstone) (Man-made aventurine glass, typically copper-bearing silica glass) — gemstone

Goldstone (brown goldstone)

Man-made aventurine glass, typically copper-bearing silica glass

Sandstone (Water-worn Cobble) (Arenite (SiO2 with CaCO3 or Fe2O3 cement)) — sedimentary

Sandstone (Water-worn Cobble)

Arenite (SiO2 with CaCO3 or Fe2O3 cement)