Rock Identifier

Category

Glass

Browse glass specimens identified by the Rock Identifier community.

Learn about Glass in the encyclopedia

Sideromelane

Black Obsidian

Maskelynite

Obsidian

Tachylite

Hyalite Opal

Perlite

Opalite

Macusanite

Pink Obsidian

Goldstone

Palagonite

Sea Glass (Amorphous silicon dioxide (man-made glass weathered by nature)) — mineral

Sea Glass

Amorphous silicon dioxide (man-made glass weathered by nature)

Sea Glass (Man-made silicate glass) — gemstone

Sea Glass

Man-made silicate glass

Sea Glass (Man-made silicate glass (Amorphous silicon dioxide)) — mineral

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Strawberry Quartz and Rose Quartz (Silicon Dioxide (SiO2) with inclusions) — mineral

Strawberry Quartz and Rose Quartz

Silicon Dioxide (SiO2) with inclusions

Quartz (Smoky or Clear variety with inclusions) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky or Clear variety with inclusions)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Amethyst (Rose-tinted variation) (Silicon Dioxide (SiO2) with trace iron impurities) — mineral

Amethyst (Rose-tinted variation)

Silicon Dioxide (SiO2) with trace iron impurities

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

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Smoky variety on matrix) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Yellow quartz crystal (likely citrine) (Quartz, silicon dioxide (SiO₂), iron-colored variety commonly called citrine) — mineral

Yellow quartz crystal (likely citrine)

Quartz, silicon dioxide (SiO₂), iron-colored variety commonly called citrine

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

Muscovite Mica

Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2

Dark brown tumbled stone, likely smoky quartz or polished jasper (Uncertain from image; possible quartz, SiO₂, or iron-rich microcrystalline silica (jasper)) — mineral

Dark brown tumbled stone, likely smoky quartz or polished jasper

Uncertain from image; possible quartz, SiO₂, or iron-rich microcrystalline silica (jasper)

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

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Pumice (Pumice (Vesicular Felsic Igneous Rock)) — igneous

Pumice

Pumice (Vesicular Felsic Igneous Rock)

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

Quartz (Smoky/Clear variety)

Silicon Dioxide (SiO2)

Quartz (Crystal Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Crystal Fragment)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Slag Glass (Cullet) (Amorphous Silica / Glass residue) — Man-made byproduct (Non-geological)

Slag Glass (Cullet)

Amorphous Silica / Glass residue

Man-made byproduct (Non-geological)

Pumice (Pumice (volcanic glass)) — igneous

Pumice

Pumice (volcanic glass)

Amethyst (Chevron Amethyst/Dream Amethyst) (Silicon Dioxide (SiO2) with trace Iron impurities) — mineral

Amethyst (Chevron Amethyst/Dream Amethyst)

Silicon Dioxide (SiO2) with trace Iron impurities

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

Clear Quartz (Faceted Crystal)

Silicon Dioxide (SiO2)

Amethyst druzy cluster (Amethyst, purple quartz (SiO₂)) — mineral

Amethyst druzy cluster

Amethyst, purple quartz (SiO₂)

Amethyst-bearing quartz (Quartz, SiO₂; purple coloration from trace iron and irradiation) — mineral

Amethyst-bearing quartz

Quartz, SiO₂; purple coloration from trace iron and irradiation

Pink quartz (likely rose quartz) (Quartz, silicon dioxide (SiO₂), typically massive rose quartz colored by trace elements and microscopic inclusions) — mineral

Pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂), typically massive rose quartz colored by trace elements and microscopic inclusions

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

Smoky Quartz (Vein Quartz)

Quartz (Silicon Dioxide, SiO2)

Tumbled green aventurine (probable) (Quartz variety: aventurine quartz, SiO₂, colored commonly by fuchsite mica) — mineral

Tumbled green aventurine (probable)

Quartz variety: aventurine quartz, SiO₂, colored commonly by fuchsite mica

Tumbled golden-brown stone, likely sandstone or weathered iron-rich quartzite (Probable ferruginous sandstone; exact identification is uncertain from the image) — sedimentary

Tumbled golden-brown stone, likely sandstone or weathered iron-rich quartzite

Probable ferruginous sandstone; exact identification is uncertain from the image

Polished carnelian agate (likely dyed or heat-treated) (Microcrystalline quartz, chiefly chalcedony; SiO₂) — gemstone

Polished carnelian agate (likely dyed or heat-treated)

Microcrystalline quartz, chiefly chalcedony; SiO₂

Milky quartz (rough quartz fragment) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Rounded quartz-rich pebble (Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)) — sedimentary

Rounded quartz-rich pebble

Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)

Weathered quartz-rich rock, possibly chert or milky quartz (Mostly microcrystalline or crystalline quartz (SiO₂), identification uncertain from photograph) — mineral

Weathered quartz-rich rock, possibly chert or milky quartz

Mostly microcrystalline or crystalline quartz (SiO₂), identification uncertain from photograph

Blue Goldstone (Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)) — Synthetic (Man-made Glass)

Blue Goldstone

Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)

Synthetic (Man-made Glass)

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

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Green beryl (likely heliodor) (Beryl, Be₃Al₂Si₆O₁₈; yellow-green varieties are heliodor or golden beryl) — mineral

Green beryl (likely heliodor)

Beryl, Be₃Al₂Si₆O₁₈; yellow-green varieties are heliodor or golden beryl

Amethyst (Quartz (SiO₂), purple variety colored mainly by iron impurities and irradiation) — gemstone

Amethyst

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

Tumbled emerald chips (Emerald, green beryl (Be₃Al₂Si₆O₁₈), colored mainly by chromium and/or vanadium) — gemstone

Tumbled emerald chips

Emerald, green beryl (Be₃Al₂Si₆O₁₈), colored mainly by chromium and/or vanadium

Polished amethyst (Quartz, SiO₂; purple variety colored mainly by iron-related defects and irradiation) — mineral

Polished amethyst

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

Tumbled amethyst (Amethyst, purple variety of quartz (SiO₂)) — mineral

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)

Tumbled rose quartz (probable) (Quartz, silicon dioxide (SiO₂), pink variety) — mineral

Tumbled rose quartz (probable)

Quartz, silicon dioxide (SiO₂), pink variety

Yellow chalcedony (likely lemon quartz or citrine) (Cryptocrystalline silica, SiO₂; possible quartz variety) — mineral

Yellow chalcedony (likely lemon quartz or citrine)

Cryptocrystalline silica, SiO₂; possible quartz variety

Citrine (Citrine (Silicon Dioxide - SiO2)) — mineral

Citrine

Citrine (Silicon Dioxide - SiO2)