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

Milky quartz-bearing rock, possibly quartzite (Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix) — metamorphic

Milky quartz-bearing rock, possibly quartzite

Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix

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

Muscovite Mica

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

Green Aventurine (Silicon Dioxide (SiO2) with inclusions of Fuchsite) — metamorphic

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

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

Muscovite Mica

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

Aventurine (Silicon Dioxide (SiO2) with inclusions of Fuchsite) — mineral

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Cobalt Blue Sea Glass (Amorphous Silica Glass (SiO2 + CoO)) — mineraloid / anthropogenic material

Cobalt Blue Sea Glass

Amorphous Silica Glass (SiO2 + CoO)

mineraloid / anthropogenic material

Libyan Desert Glass (Libyan Desert Glass (Tektite / Impact Glass)) — meteorite

Libyan Desert Glass

Libyan Desert Glass (Tektite / Impact Glass)

Blue goldstone (Man-made aventurine glass containing metallic copper particles; not a natural mineral) — mineral

Blue goldstone

Man-made aventurine glass containing metallic copper particles; not a natural mineral

Opalite (Synthetic Opalized Glass / Man-made Glass) — gemstone

Opalite

Synthetic Opalized Glass / Man-made Glass

Pink Quartz / Sea Glass (Silicon Dioxide (SiO2)) — mineral

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Sea Glass (Amorphous silicon dioxide (glass)) — mineral

Sea Glass

Amorphous silicon dioxide (glass)

Snowflake Obsidian (Volcanic Glass (SiO2 + impurities)) — igneous

Snowflake Obsidian

Volcanic Glass (SiO2 + impurities)

Snowflake Obsidian (Spherulitic Volcanic Glass (primarily SiO2)) — igneous

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2)

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation (SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)) — mineral

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Milky Quartz with inclusions (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with inclusions

Silicon Dioxide (SiO2)

Green Aventurine (Aventurine Quartz (SiO2 + Fuchsite mica)) — Mineral

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

Tumbled black stone, likely black obsidian (Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)) — igneous

Tumbled black stone, likely black obsidian

Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)

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

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Muscovite Schist with Quartz (Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz Matrix) — metamorphic

Muscovite Schist with Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz Matrix

Mica Specimen (Schist / Muscovite) (Muscovite / Biotite Mica (KAl2(AlSi3O10)(F,OH)2)) — metamorphic

Mica Specimen (Schist / Muscovite)

Muscovite / Biotite Mica (KAl2(AlSi3O10)(F,OH)2)

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

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Blue Sea Glass (Amorphous Silica (Anthropogenic glass)) — not a rock (man-made origin)

Blue Sea Glass

Amorphous Silica (Anthropogenic glass)

not a rock (man-made origin)

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Obsidian (Volcanic Glass) — igneous

Obsidian

Volcanic Glass

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Black Obsidian (Volcanic glass) — igneous

Black Obsidian

Volcanic glass

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Obsidian (Volcanic Glass) — igneous

Obsidian

Volcanic Glass

Obsidian (Volcanic Glass) — igneous

Obsidian

Volcanic Glass

Blue Goldstone (Aventurine Glass) — man-made glass

Blue Goldstone

Aventurine Glass

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Blue Goldstone (Aventurine Glass) — Man-made glass (often grouped with minerals in lapidary)

Blue Goldstone

Aventurine Glass

Man-made glass (often grouped with minerals in lapidary)

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Blue Goldstone (Aventurine Glass) — Man-made mineral simulant (Glass)

Blue Goldstone

Aventurine Glass

Man-made mineral simulant (Glass)

Moldavite (Tektite) — meteorite

Moldavite

Tektite

Cullet Glass (Slag Glass) (Amorphous Silicon Dioxide (Industrial byproduct)) — mineraloid

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Likely polished quartz or glass-like mineral cabochon (Probably quartz (SiO₂), though the image cannot exclude man-made glass) — mineral

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass

Blue Goldstone (Man-made glass with suspended copper, cobalt, or manganese particles) — man-made glass

Blue Goldstone

Man-made glass with suspended copper, cobalt, or manganese particles

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Black onyx or black obsidian bead bracelet (Likely black chalcedony (microcrystalline quartz, SiO₂); possibly volcanic glass (obsidian, SiO₂)) — gemstone

Black onyx or black obsidian bead bracelet

Likely black chalcedony (microcrystalline quartz, SiO₂); possibly volcanic glass (obsidian, SiO₂)

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

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2