Rock Identifier

Category

Glass

Browse glass specimens identified by the Rock Identifier community.

Learn about Glass in the encyclopedia

Sideromelane

Sideromelane

Black Obsidian

Black Obsidian

Maskelynite

Maskelynite

Obsidian

Obsidian

Tachylite

Tachylite

Hyalite Opal

Hyalite Opal

Macusanite

Macusanite

Perlite

Perlite

Opalite

Opalite

Pink Obsidian

Pink Obsidian

Goldstone

Goldstone

Palagonite

Palagonite

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Sandstone

Arenite (SiO2 with various cementing agents)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Sandstone (Ferruginous) (Arenite (with Iron Oxide)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Quartzite River Rock (Metamorphic Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Sandstone (Pebble) (Arenite (SiO2 based)) — sedimentary

Sandstone (Pebble)

Arenite (SiO2 based)

White Topaz (Al2SiO4(F,OH)2) — mineral

White Topaz

Al2SiO4(F,OH)2

Jasper (Chalcedony (SiO2)) — Sedimentary/Mineral

Jasper

Chalcedony (SiO2)

Sedimentary/Mineral

Quartz Sand Gravel (Silicon Dioxide (SiO2)) — sedimentary

Quartz Sand Gravel

Silicon Dioxide (SiO2)

Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)

Silicon Dioxide (SiO2)

Obsidian (Volcanic Glass (Amorphous Silica, SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous Silica, SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Grey Quartz (likely Smoky Quartz or Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Grey Quartz (likely Smoky Quartz or Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Small Grains) (Silicon Dioxide (SiO2)) — mineral

Quartz (Small Grains)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Opalite (Synthetic Glass (Silica-based)) — gemstone

Opalite

Synthetic Glass (Silica-based)

Snowflake Obsidian (Volcanic Glass with Cristobalite inclusions) — igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Pumice (Pumice (a highly vesicular extrusive volcanic glass)) — igneous

Pumice

Pumice (a highly vesicular extrusive volcanic glass)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

Pumice (Pumice (Amorphous volcanic glass)) — Igneous

Pumice

Pumice (Amorphous volcanic glass)

Opaline Glass (Opalite) (Synthetic Silicon Dioxide Glass) — Mineraloid (Man-made)

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Mineraloid (Man-made)

Pumice (Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)) — igneous

Pumice

Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)

Pumice (Pumice (Vesicular volcanic glass)) — igneous

Pumice

Pumice (Vesicular volcanic glass)

Milky Quartz with Iron Staining (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Fulgurite (Fulgurite (Lechatelierite-rich variety)) — metamorphic

Fulgurite

Fulgurite (Lechatelierite-rich variety)

Snowflake Obsidian (Vitreous Volcanic Rock (Amorphous Silicate), SiO2) — igneous

Snowflake Obsidian

Vitreous Volcanic Rock (Amorphous Silicate), SiO2

Slag (Industrial Glass) (Artificial Vitreous Silicate) — mineraloid (anthropogenic)

Slag (Industrial Glass)

Artificial Vitreous Silicate

mineraloid (anthropogenic)

Quartzite pebble (Quartzite (SiO2 based)) — metamorphic

Quartzite pebble

Quartzite (SiO2 based)

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

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Quartzite Pebble (Quartzite (mostly SiO2)) — metamorphic

Quartzite Pebble

Quartzite (mostly SiO2)

Chert (Flint Nodules) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint Nodules)

Cryptocrystalline Quartz (SiO2)

Quartzite (Quartz sand or Chert) (Quartzite (SiO2)) — metamorphic

Quartzite (Quartz sand or Chert)

Quartzite (SiO2)

Pumice (Pumice (Vesicular Rhyolite/Andesite)) — igneous

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Green Aventurine (Aventurine Quartz (SiO2 with Fuchsite inclusions)) — metamorphic

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Quartzite with Quartz Veining (Quartzite (primarily SiO2)) — metamorphic

Quartzite with Quartz Veining

Quartzite (primarily SiO2)

Quartzite (River Pebble) (Quartzite (primarily SiO2)) — metamorphic

Quartzite (River Pebble)

Quartzite (primarily SiO2)

Educational Geologic Collection (Mixed Mineral and Rock Collection (Various compositions)) — mineral

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

Quartzite (Gold/Tan River Cobble) (Quartzite (composed primarily of crystalline SiO2)) — metamorphic

Quartzite (Gold/Tan River Cobble)

Quartzite (composed primarily of crystalline SiO2)

Obsidian (Volcanic Glass (SiO2 rich)) — igneous

Obsidian

Volcanic Glass (SiO2 rich)