Rock Identifier

Category

Synthetic (Man Made Glass)

Browse synthetic (man made glass) specimens identified by the Rock Identifier community.

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

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)

Granite / Quartz Vein Rock (Granitoid with Quartz (SiO2)) — igneous

Granite / Quartz Vein Rock

Granitoid with Quartz (SiO2)

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

Clear Quartz Crystal (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Quartzite with Chlorite/Epidote (Metamorphosed Quartzite (SiO2)) — metamorphic

Quartzite with Chlorite/Epidote

Metamorphosed Quartzite (SiO2)

Green Slag Glass (Amorphous Silica Glass (Anthropogenic)) — Industrial byproduct (often mistaken for obsidian or mineral)

Green Slag Glass

Amorphous Silica Glass (Anthropogenic)

Industrial byproduct (often mistaken for obsidian or mineral)

Chert (Tan/Grey variety) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Tan/Grey variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

White Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — mineral

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Chert (Fossiliferous) (Silicon dioxide (SiO2)) — sedimentary

Chert (Fossiliferous)

Silicon dioxide (SiO2)

Sandstone (likely Graywacke or Arkosic varieties) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (likely Graywacke or Arkosic varieties)

Arenite (composed primarily of SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Smoky Quartz (Faceted Beads) (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz (Faceted Beads)

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Obsidian (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

Ferrous Slag (Fused calcium-iron silicates (Industrial Slag)) — Anthropogenic/Industrial byproduct

Ferrous Slag

Fused calcium-iron silicates (Industrial Slag)

Anthropogenic/Industrial byproduct

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (Quartzite (chiefly SiO2)) — metamorphic

Quartzite

Quartzite (chiefly SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Slag (Industrial Glassy Byproduct) (Ferro-silicate Slag) — Anthropogenic / Non-Natural

Slag (Industrial Glassy Byproduct)

Ferro-silicate Slag

Anthropogenic / Non-Natural

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

Snowflake Obsidian

Spherulitic Obsidian (primarily SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Pumice (Pumiceous rhyolite / Volcanic glass) — igneous

Pumice

Pumiceous rhyolite / Volcanic glass

Mahogany Obsidian (Volcanic Glass with Hematite/Magnetite (SiO2 + Fe2O3)) — igneous

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite (SiO2 + Fe2O3)

Obsidian (Amorphous volcanic glass (primarily SiO2)) — igneous

Obsidian

Amorphous volcanic glass (primarily SiO2)

Pumice (Vesicular volcanic glass (Amorphous silica mixed with various oxides)) — igneous

Pumice

Vesicular volcanic glass (Amorphous silica mixed with various oxides)

Pumice (Pumice (a highly vesicular extrusive igneous rock)) — igneous

Pumice

Pumice (a highly vesicular extrusive igneous rock)

Mahogany Obsidian (Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)) — igneous

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)

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

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Obsidian

Volcanic Glass (SiO2 + impurities)

Quartzite Pebble (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Green Aventurine (Silicon dioxide (SiO2) with inclusions of Fuchsite) — mineral

Green Aventurine

Silicon dioxide (SiO2) with inclusions of Fuchsite

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Chert / Flint (Silicon Dioxide (SiO2)) — sedimentary

Chert / Flint

Silicon Dioxide (SiO2)

Quartzite with Quartz Veins (Quartzite (chiefly SiO2)) — metamorphic

Quartzite with Quartz Veins

Quartzite (chiefly SiO2)

Green Quartzite (Quartzite (primarily SiO2 with trace impurities)) — metamorphic

Green Quartzite

Quartzite (primarily SiO2 with trace impurities)

Quartzite Cobble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Cobble

Quartzite (primarily SiO2)

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

Obsidian

Obsidian (Volcanic Glass, SiO2)

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

Black Obsidian

Volcanic Glass (SiO2 + impurities)