Rock Identifier

Category

Tektite (Natural Glass)

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

Learn about Tektite (Natural Glass) in the encyclopedia

Macusanite

Moldavite

Obsidian

Black Obsidian

Green Obsidian

Blue Obsidian

Midnight Obsidian

Maskelynite

Pink Obsidian

Purple Obsidian

Purple Obsidian

Teal Obsidian

Yellow-Green Obsidian

Yellow-Green Obsidian

Opalite (Synthetic Opalite Glass / Opalized Glass) — gemstone

Opalite

Synthetic Opalite Glass / Opalized Glass

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

Opalite

Man-made Opalized Glass (Synthetic Glass)

Opalite (Synthetic Glass (Simulated Opal)) — gemstone

Opalite

Synthetic Glass (Simulated Opal)

Opalite (Synthetic glass / Opalized glass) — gemstone

Opalite

Synthetic glass / Opalized glass

Opalite (Synthetic glass / Opalized glass) — gemstone

Opalite

Synthetic glass / Opalized glass

Man-made Glass (Tumbled/Shaped) (Amorphous Silicon Dioxide (SiO2) with metal oxide colorants) — Mineraloid (synthetic)

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Mineraloid (synthetic)

Dyed or synthetic turquoise-blue glass-like specimen (Likely man-made colored glass or resin; exact identification requires testing) — mineral

Dyed or synthetic turquoise-blue glass-like specimen

Likely man-made colored glass or resin; exact identification requires testing

Goldstone (Brown) (Aventurine glass) — mineraloid (man-made)

Goldstone (Brown)

Aventurine glass

mineraloid (man-made)

Blue Sapphire (Synthetic or Man-made Glass Imitation) (Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic) — mineral

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

Opalite (Synthetic Silicon Dioxide (SiO2)) — mineral

Opalite

Synthetic Silicon Dioxide (SiO2)

Opalite (Synthetic Opalized Glass) (Synthetic Silicon Dioxide (SiO2) glass) — mineral

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Blue Obsidian (Cullet Glass) (Silicon Dioxide (Amorphous Glass)) — mineral

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Blue cabochon gemstone, likely synthetic spinel or glass (Undetermined; possible synthetic cobalt-blue spinel (MgAl₂O₄) or colored glass) — gemstone

Blue cabochon gemstone, likely synthetic spinel or glass

Undetermined; possible synthetic cobalt-blue spinel (MgAl₂O₄) or colored glass

Blue goldstone beads (Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli) — mineral

Blue goldstone beads

Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli

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)

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

Black obsidian (likely) (Volcanic glass; predominantly silica-rich, non-crystalline silicate glass) — igneous

Black obsidian (likely)

Volcanic glass; predominantly silica-rich, non-crystalline silicate glass

Green Obsidian Sphere (man-made glass) (Vitreous Silica with Chromium/Iron additives) — mineralogical simulant

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

mineralogical simulant

Opalite (likely man-made glass) (Opalite; amorphous silica glass, not a natural mineral) — gemstone

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Diamond (or Diamond Simulant) (Carbon (C)) — gemstone

Diamond (or Diamond Simulant)

Carbon (C)

Opalite (Man-made Glass) (Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)) — Synthetic Mineral Simulant / Glass

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Synthetic Mineral Simulant / Glass

Opalite (Man-made Glass) (Synthetic Opalised Glass) — mineral

Opalite (Man-made Glass)

Synthetic Opalised Glass

Opalite (a synthetic glass) (Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant) — Mineral Simulant (Synthetic Glass)

Opalite (a synthetic glass)

Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant

Mineral Simulant (Synthetic Glass)

Opalite (Man-made Glass (Synthetic Opalized Glass)) — mineral

Opalite

Man-made Glass (Synthetic Opalized Glass)

Prasiolite (Green Quartz) / Sea Glass Amalgam (SiO2 (Silicon Dioxide)) — mineral

Prasiolite (Green Quartz) / Sea Glass Amalgam

SiO2 (Silicon Dioxide)

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

Opalite

Synthetic Opalized Glass / Man-made Glass

Goldstone (Avventurina (Cu + SiO2 glass)) — mineral

Goldstone

Avventurina (Cu + SiO2 glass)

Opalite (Man-made opalized glass) — mineral

Opalite

Man-made opalized glass

Opalite (Man-made opalescent glass) — gemstone

Opalite

Man-made opalescent glass

Tumbled opalite (likely synthetic glass) (Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species) — gemstone

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Black tumbled stone, possibly obsidian (Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image) — igneous

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Green sea glass (likely bottle glass) (Man-made soda-lime silicate glass; not a natural mineral) — mineral

Green sea glass (likely bottle glass)

Man-made soda-lime silicate glass; not a natural mineral

Glass Nugget (Tumbled Glass) (Amorphous Silicon Dioxide (SiO2) with additives) — mineraloid (man-made)

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

mineraloid (man-made)

Green glass-like cabochon, likely synthetic glass or resin (Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin) — gemstone

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Polished blue-green glassy slag or coated mineral fragment (Most likely man-made colored glass/slag; exact composition cannot be determined visually) — mineral

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Opalite (Synthetic Glass (Hydrated Silica Simulant)) — mineral

Opalite

Synthetic Glass (Hydrated Silica Simulant)

Blue-green slag glass or chalcedony-like material (Likely industrial glassy slag; exact identification requires testing) — mineral

Blue-green slag glass or chalcedony-like material

Likely industrial glassy slag; exact identification requires testing

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

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Mineraloid (Man-made)

Cullet Glass (Industrial Slag Glass) (Amorphous Silica (SiO2) with metallic oxide impurities) — Man-made byproduct (often mistaken for Obsidian or Emerald)

Cullet Glass (Industrial Slag Glass)

Amorphous Silica (SiO2) with metallic oxide impurities

Man-made byproduct (often mistaken for Obsidian or Emerald)

Opalite (Synthetic Opalized Glass) — mineraloid (man-made)

Opalite

Synthetic Opalized Glass

mineraloid (man-made)

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Sedimentary Clastic Rock) — sedimentary

Sandstone

Sedimentary Clastic Rock