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

Sandstone (likely Arkosic or Quartzose) (Sandstone (SiO2 dominated)) — sedimentary

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 dominated)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone) (Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)) — mineral (synthetic)

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

mineral (synthetic)

Tumbled amber-brown quartz (probable smoky quartz or carnelian) (Quartz, SiO₂; color may reflect iron impurities or irradiation) — mineral

Tumbled amber-brown quartz (probable smoky quartz or carnelian)

Quartz, SiO₂; color may reflect iron impurities or irradiation

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Slag Glass (Cullet Glass) (Amorphous Silica (Industrial byproduct)) — mineral

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Possible industrial slag or basaltic volcanic glass (Likely iron-rich vitreous slag; natural alternative: basaltic glass (tachylite)) — igneous

Possible industrial slag or basaltic volcanic glass

Likely iron-rich vitreous slag; natural alternative: basaltic glass (tachylite)

Iron-stained Quartz (Silicon Dioxide with Iron Oxide (SiO2 with Limonite/Hematite impurities)) — mineral

Iron-stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 with Limonite/Hematite impurities)

Opalite (Man-made opalescent glass (SiO2 + metal oxides)) — mineral (synthetic)

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

mineral (synthetic)

Clear Quartz (Tumbled) (Quartz (Silicon Dioxide - SiO2)) — mineral

Clear Quartz (Tumbled)

Quartz (Silicon Dioxide - SiO2)

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

Quartz (Smoky/Grey Variety)

Silicon Dioxide (SiO2)

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

Green Aventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite)

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

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Moldavite (Tektite) — meteorite

Moldavite

Tektite

Polished obsidian (Volcanic glass, primarily silica-rich rhyolitic composition (approximately 70–75% SiO₂)) — igneous

Polished obsidian

Volcanic glass, primarily silica-rich rhyolitic composition (approximately 70–75% SiO₂)

Citrine (Silicon dioxide (SiO2)) — mineral

Citrine

Silicon dioxide (SiO2)

Citrine (likely Heat-Treated Amethyst) (Silicon Dioxide (SiO2)) — mineral

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Amethyst (Silicon dioxide with iron impurities (SiO2 + Fe3+)) — mineral

Amethyst

Silicon dioxide with iron impurities (SiO2 + Fe3+)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Pebble (possibly Chalcedony or Chert) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (possibly Chalcedony or Chert)

Silicon Dioxide (SiO2)

Red glass-like crystal, likely synthetic ruby or red glass (Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass) — gemstone

Red glass-like crystal, likely synthetic ruby or red glass

Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Arenite (SiO2 variety)) — sedimentary

Sandstone

Arenite (SiO2 variety)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Citrine (Silicon Dioxide (SiO2)) — gemstone

Citrine

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

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

Amethyst

Silicon Dioxide with iron impurities (SiO2)

Granite Pebble (Granite (Phaneritic Igneous Rock)) — igneous

Granite Pebble

Granite (Phaneritic Igneous Rock)

Citrine (Heat-treated Amethyst) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz Geode / Chalcedony Nodule (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz Geode / Chalcedony Nodule

Quartz (Silicon Dioxide - SiO2)

Tektite (Natural Impact Glass) — meteorite

Tektite

Natural Impact Glass

Smoky Quartz (Silicon Dioxide (SiO₂)) — mineral

Smoky Quartz

Silicon Dioxide (SiO₂)

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

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

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

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

White/green translucent tumbled mineral fragment (Likely calcite (CaCO₃), possibly fluorite (CaF₂) or glass-like feldspar; visual identification is uncertain) — mineral

White/green translucent tumbled mineral fragment

Likely calcite (CaCO₃), possibly fluorite (CaF₂) or glass-like feldspar; visual identification is uncertain

Blue Sapphire (Corundum (Al2O3 - Aluminum Oxide)) — mineral

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Smoky Quartz with Iron Inclusions (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Red/pink faceted gemstone, likely synthetic ruby or red glass (Corundum (Al₂O₃) if ruby; identity cannot be confirmed visually) — gemstone

Red/pink faceted gemstone, likely synthetic ruby or red glass

Corundum (Al₂O₃) if ruby; identity cannot be confirmed visually

Heat-Treated Citrine (Amethyst) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities