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

Green glass cabochon or tumbled stone (Indeterminate; likely man-made glass, possibly aventurine glass rather than a natural mineral) — mineral

Green glass cabochon or tumbled stone

Indeterminate; likely man-made glass, possibly aventurine glass rather than a natural mineral

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)

Likely quartz-bearing rock or mineral fragment (Indeterminate; possibly quartz (SiO₂) with iron-oxide staining and darker matrix) — mineral

Likely quartz-bearing rock or mineral fragment

Indeterminate; possibly quartz (SiO₂) with iron-oxide staining and darker matrix

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Snowflake Obsidian (Obsidian with Spherulitic Cristobalite (SiO2)) — igneous

Snowflake Obsidian

Obsidian with Spherulitic Cristobalite (SiO2)

Quartz (Milky/Clear) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Opalite (likely man-made glass) (Opalite is a trade name for opalescent glass, not a natural mineral; composition is typically silica glass with additives) — mineral

Opalite (likely man-made glass)

Opalite is a trade name for opalescent glass, not a natural mineral; composition is typically silica glass with additives

Pumice (Pumice) — igneous

Pumice

Pumice

Strawberry Quartz (or Sunstone / Tumbled Quartz) (Silicon Dioxide (SiO2) with Hematite/Lepidocrocite inclusions) — mineral

Strawberry Quartz (or Sunstone / Tumbled Quartz)

Silicon Dioxide (SiO2) with Hematite/Lepidocrocite inclusions

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

Quartz (Clear or Smoky)

Silicon Dioxide (SiO2)

Milky Quartz Pebble with Matrix (Quartz (SiO2)) — mineral

Milky Quartz Pebble with Matrix

Quartz (SiO2)

Quartz (Milky/Common) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz crystal fragment (likely milky/inclusion-rich quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Quartz crystal fragment (likely milky/inclusion-rich quartz)

Quartz, silicon dioxide (SiO₂)

Mixed Tumbled Quartz and Chlorite Quartz (Silicon Dioxide (SiO2) with inclusions) — mineral

Mixed Tumbled Quartz and Chlorite Quartz

Silicon Dioxide (SiO2) with inclusions

Quartz / Common Opal (Silicon Dioxide (SiO2)) — mineral

Quartz / Common Opal

Silicon Dioxide (SiO2)

Tektite (Natural impact glass) — meteorite

Tektite

Natural impact glass

Quartz (Smoky/Grey variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Grey variety)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pearl (Imitation / Cultured Pearl) (Calcium carbonate (CaCO3) with conchiolin (or synthetic glass/plastic imitation)) — gemstone

Pearl (Imitation / Cultured Pearl)

Calcium carbonate (CaCO3) with conchiolin (or synthetic glass/plastic imitation)

Opalite (Synthetic glass (Opalite simulant)) — gemstone

Opalite

Synthetic glass (Opalite simulant)

Carved opalite pendant (Opalite (man-made opalescent glass; not a natural mineral)) — gemstone

Carved opalite pendant

Opalite (man-made opalescent glass; not a natural mineral)

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

Opalite

Synthetic Glass / Man-made Opal Simulant

Chert (Jasper variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (often called Flint) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (often called Flint)

Microcrystalline quartz (SiO2)

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

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

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

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Chert (Flint) (Microcrystalline Quartz or Cryptocrystalline Silica (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz or Cryptocrystalline Silica (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

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

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Lemon Quartz (Orizaba/Citrinated Quartz) (Silicon Dioxide (SiO2) with iron impurities/treatment) — mineral

Lemon Quartz (Orizaba/Citrinated Quartz)

Silicon Dioxide (SiO2) with iron impurities/treatment

Yellow chalcedony (likely citrine-like quartz) (Cryptocrystalline quartz, SiO₂; possibly iron-stained chalcedony or pale citrine) — mineral

Yellow chalcedony (likely citrine-like quartz)

Cryptocrystalline quartz, SiO₂; possibly iron-stained chalcedony or pale citrine

Tumbled translucent quartz or chalcedony (Silicon dioxide (SiO₂), likely quartz/chalcedony) — mineral

Tumbled translucent quartz or chalcedony

Silicon dioxide (SiO₂), likely quartz/chalcedony

Muscovite Mica (Muscovite - KAl2(AlSi3O10)(F,OH)2) — mineral

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(F,OH)2

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

Tumbled brown quartzite or chert (Quartzite, predominantly microcrystalline quartz (SiO₂); exact identification is uncertain from an image) — metamorphic

Tumbled brown quartzite or chert

Quartzite, predominantly microcrystalline quartz (SiO₂); exact identification is uncertain from an image

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

Muscovite

Muscovite, KAl2(AlSi3O10)(OH)2

Muscovite Mica in Quartz (Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)) — metamorphic

Muscovite Mica in Quartz

Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)

Opalite-style glass pendant (Man-made opalescent glass (not natural opal)) — mineral

Opalite-style glass pendant

Man-made opalescent glass (not natural opal)

Smoky Quartz with Feldspar (Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)) — mineral

Smoky Quartz with Feldspar

Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)

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

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)