Rock Identifier

Category

Glass

Browse glass specimens identified by the Rock Identifier community.

Learn about Glass in the encyclopedia

Sideromelane

Black Obsidian

Maskelynite

Tachylite

Obsidian

Hyalite Opal

Perlite

Opalite

Macusanite

Pink Obsidian

Goldstone

Palagonite

Sea Glass (Frosted Glass Fragment) (Amorphous Silica (Anthropogenic Sediment)) — sedimentary

Sea Glass (Frosted Glass Fragment)

Amorphous Silica (Anthropogenic Sediment)

Green sea glass (likely bottle glass) (Man-made soda–lime silicate glass; not a natural mineral) — mineral

Green sea glass (likely bottle glass)

Man-made soda–lime silicate glass; not a natural mineral

Green Sea Glass (Man-made vitreous material (silica glass)) — gemstone

Green Sea Glass

Man-made vitreous material (silica glass)

Opalite (likely imitation opal glass) (Man-made opalescent glass; not a natural mineral (often sold as opalite)) — mineral

Opalite (likely imitation opal glass)

Man-made opalescent glass; not a natural mineral (often sold as opalite)

Opalite (Synthetic Moonstone/Opal) (Synthetic Silica Glass) — mineraloid (synthetic)

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

mineraloid (synthetic)

Blue Glass / Slag Glass (Amorphous silicon dioxide (SiO2) with cobalt colorants) — mineral

Blue Glass / Slag Glass

Amorphous silicon dioxide (SiO2) with cobalt colorants

Uncertain blue-white mineral fragment (Possibly calcite or quartz; identification is limited because the specimen is tiny and partly translucent) — mineral

Uncertain blue-white mineral fragment

Possibly calcite or quartz; identification is limited because the specimen is tiny and partly translucent

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

Green Obsidian Slag Glass (Silicon Dioxide (Amorphous Glass)) — mineral

Green Obsidian Slag Glass

Silicon Dioxide (Amorphous Glass)

Muscovite Mica (KAl2(AlSi3O10)(OH)2) — mineral

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Muscovite (KAl2(AlSi3O10)(OH)2) — mineral

Muscovite

KAl2(AlSi3O10)(OH)2

Cullet Glass / Slag Glass (Amorphous silica glass) — man-made glass / industrial byproduct

Cullet Glass / Slag Glass

Amorphous silica glass

man-made glass / industrial byproduct

Opalite (Synthesized glass / Silicon dioxide glass) — gemstone

Opalite

Synthesized glass / Silicon dioxide glass

Libyan Desert Glass (Libyan Desert Glass (Impactite)) — meteorite

Libyan Desert Glass

Libyan Desert Glass (Impactite)

Snowflake Obsidian (Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)) — igneous

Snowflake Obsidian

Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)

Small black stone fragment (possibly obsidian) (Unidentified dark rock; obsidian is volcanic glass (composition typically rhyolitic)) — igneous

Small black stone fragment (possibly obsidian)

Unidentified dark rock; obsidian is volcanic glass (composition typically rhyolitic)

Muscovite Mica (Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)) — mineral

Muscovite Mica

Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)

Goldstone beads (likely brown goldstone) (Man-made copper-bearing glass; not a natural mineral. Often sold as “aventurine glass.”) — gemstone

Goldstone beads (likely brown goldstone)

Man-made copper-bearing glass; not a natural mineral. Often sold as “aventurine glass.”

Green sea glass or tumbled green quartz (uncertain) (Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass) — mineral

Green sea glass or tumbled green quartz (uncertain)

Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass

Sea Glass (Cobalt Blue) (Amorphous Silica (Glass with Cobalt additives)) — Anthropogenic specimen (man-made)

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Anthropogenic specimen (man-made)

Cobalt Glass Slug (Man-made Glass) (Amorphous Silica with Cobalt Oxide (SiO2 + CoO)) — mineraloid

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Slag Glass (Cullet) (Amorphous Silicon Dioxide (SiO2) with metal oxide colorants) — Anthropogenic (Man-made)

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Anthropogenic (Man-made)

Cullet (Slag Glass) (Amorphous Silica (SiO2) with various metal oxide colorants) — mineraloid / anthropogenic

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

mineraloid / anthropogenic

Dragon's Breath (Mexican Opal Glass) (Artisan Foil Glass (SiO2 based)) — mineraloid

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Obsidian (Volcanic glass (Mainly SiO2)) — igneous

Obsidian

Volcanic glass (Mainly SiO2)

Muscovite (KAl2(AlSi3O10)(OH)2) — mineral

Muscovite

KAl2(AlSi3O10)(OH)2

Muscovite (KAl2(AlSi3O10)(OH)2) — mineral

Muscovite

KAl2(AlSi3O10)(OH)2

Muscovite Mica (KAl2(AlSi3O10)(OH)2) — mineral

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Muscovite Mica (Muscovite (KAl2(AlSi3O10)(OH)2)) — mineral

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Muscovite Mica (Golden/Yellow variety) (KAl2(AlSi3O10)(F,OH)2) — mineral

Muscovite Mica (Golden/Yellow variety)

KAl2(AlSi3O10)(F,OH)2

Likely green bottle glass, not a geological specimen (Manufactured soda-lime silicate glass) — mineral

Likely green bottle glass, not a geological specimen

Manufactured soda-lime silicate glass

Obsidian (Volcanic Glass (Silica-rich glass)) — igneous

Obsidian

Volcanic Glass (Silica-rich glass)

Obsidian (Volcanic Glass (Silica-rich glass)) — igneous

Obsidian

Volcanic Glass (Silica-rich glass)

Tumbled green glassy mineral, possibly aventurine or fluorite (Uncertain; likely quartz variety (aventurine quartz, SiO₂) or green fluorite (CaF₂)) — mineral

Tumbled green glassy mineral, possibly aventurine or fluorite

Uncertain; likely quartz variety (aventurine quartz, SiO₂) or green fluorite (CaF₂)

Blue Goldstone (Synthetic Avanturine Glass (or Aventurine Glass)) — Synthetic Glass

Blue Goldstone

Synthetic Avanturine Glass (or Aventurine Glass)

Synthetic Glass

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

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (SiO2)

Opalite (Synthetic Glass (typically Silica/Magnesium based with metal additives)) — mineral

Opalite

Synthetic Glass (typically Silica/Magnesium based with metal additives)

Blue Slag Glass (Amorphous Silica (Industrial byproduct)) — Antropogenic (Man-made glass byproduct)

Blue Slag Glass

Amorphous Silica (Industrial byproduct)

Antropogenic (Man-made glass byproduct)

Blue goldstone beads (Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli) — mineral

Blue goldstone beads

Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli

Snowflake Obsidian (Volcanic glass with Phenocrysts (SiO2 with Cristobalite inclusions)) — igneous

Snowflake Obsidian

Volcanic glass with Phenocrysts (SiO2 with Cristobalite inclusions)

Blue slag glass / industrial glass fragment (Artificial silicate glass, composition variable; likely copper- or cobalt-colored furnace slag) — mineral

Blue slag glass / industrial glass fragment

Artificial silicate glass, composition variable; likely copper- or cobalt-colored furnace slag