Rock Identifier

Category

Mineral Like (Natural Glass)

Browse mineral like (natural glass) specimens identified by the Rock Identifier community.

Learn about Mineral Like (Natural Glass) in the encyclopedia

Obsidian

Black Obsidian

Macusanite

Baddeleyite

Green Obsidian

Blue Obsidian

Maskelynite

Midnight Obsidian

Sideromelane

Yellow-Green Obsidian

Yellow-Green Obsidian

Perlite

Pink Obsidian

Blue Agate (Dyed or Treated Chalcedony) (Silicon Dioxide (SiO2), microcrystalline quartz variety) — mineral

Blue Agate (Dyed or Treated Chalcedony)

Silicon Dioxide (SiO2), microcrystalline quartz variety

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

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Mixed river-worn rock and mineral collection (Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble) — igneous, sedimentary, metamorphic, mineral

Mixed river-worn rock and mineral collection

Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble

igneous, sedimentary, metamorphic, mineral

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Citrine (Silicon Dioxide (SiO2)) — Mineral

Citrine

Silicon Dioxide (SiO2)

Quartz (Gray/Smoky Variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Gray/Smoky Variety)

Silicon Dioxide (SiO2)

Tumbled Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Tumbled Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

Smoky Quartz

Quartz (Silicon Dioxide) - SiO2

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Quartz (Golden Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Golden Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz (Engineered Quartz Surface) (Silicon Dioxide (SiO2) based composite) — mineral (man-made composite)

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

mineral (man-made composite)

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

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Likely citrine or yellow quartz fragment (Quartz, SiO₂; possibly iron-colored citrine) — mineral

Likely citrine or yellow quartz fragment

Quartz, SiO₂; possibly iron-colored citrine

Green Quartz (Prasiolite/Adventurine) (Silicon Dioxide with inclusions (SiO2)) — mineral

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide with inclusions (SiO2)

Dyed tumbled quartz (likely quartzite or quartz crystal) (Quartz, silicon dioxide (SiO₂)) — mineral

Dyed tumbled quartz (likely quartzite or quartz crystal)

Quartz, silicon dioxide (SiO₂)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (Smoky Quartz (SiO2)) — mineral

Smoky Quartz

Smoky Quartz (SiO2)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Tumbled Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Tumbled Amethyst

Silicon Dioxide (SiO2) with iron impurities

Fluorescent glassy mineral specimen, possibly hyalite opal (Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative) — mineral

Fluorescent glassy mineral specimen, possibly hyalite opal

Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative

Sandstone (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone

Clastic Sedimentary Rock (primarily SiO2)

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

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Strawberry Quartz (Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)) — mineral

Strawberry Quartz

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Sandstone (Arenite (composed primarily of Quartz, SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of Quartz, SiO2)

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

Smoky Quartz (Faceted Beads)

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine or Yellow Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine or Yellow Chalcedony)

Silicon Dioxide (SiO2)

Strawberry Quartz (Hematoid Quartz) (Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)) — mineral

Strawberry Quartz (Hematoid Quartz)

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Smoky Quartz (Smoky Quartz (SiO2)) — mineral

Smoky Quartz

Smoky Quartz (SiO2)

Quartz Pebble (Tumbled / River Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble (Tumbled / River Pebble)

Silicon Dioxide (SiO2)

Slag Glass (Vitreous Silicate Residue) — industrial byproduct (anthropogenic rock)

Slag Glass

Vitreous Silicate Residue

industrial byproduct (anthropogenic rock)

Diamond (or Diamond Simulant) (Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)) — gemstone

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)

Possible tumbled obsidian (Volcanic glass, primarily rhyolitic silica glass (SiO₂-rich)) — igneous

Possible tumbled obsidian

Volcanic glass, primarily rhyolitic silica glass (SiO₂-rich)

Citrine Quartz (Crystalline Quartz (SiO2 with iron impurities)) — mineral

Citrine Quartz

Crystalline Quartz (SiO2 with iron impurities)

Cubic Zirconia (Zirconium dioxide (ZrO2)) — mineral

Cubic Zirconia

Zirconium dioxide (ZrO2)

Dyed blue banded agate (Microcrystalline quartz (SiO₂), mainly chalcedony) — mineral

Dyed blue banded agate

Microcrystalline quartz (SiO₂), mainly chalcedony

Opalite (a synthetic glass, often confused with Opal) (Silicon dioxide glass (SiO2nH2O, for natural opal)) — Synthetic (glass)

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Synthetic (glass)