Snowflake Obsidian
Volcanic Glass (SiO2) with Cristobalite inclusions
igneous
Category
Mineral Simulant (Synthetic Glass)
Browse mineral simulant (synthetic glass) specimens identified by the Rock Identifier community.
Learn about Mineral Simulant (Synthetic Glass) in the encyclopedia
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Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Green sea glass (likely slag glass or bottle glass)
Man-made soda-lime silicate glass; not a naturally occurring mineral
mineral
Snowflake Obsidian (Polished Cabochon)
Obsidian with Spherulitic Cristobalite (SiO2)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Green sea glass (likely bottle glass)
Man-made soda–lime silicate glass; not a natural mineral
mineral
Snowflake Obsidian
Hydrated Volcanic Glass with Cristobalite inclusions
igneous
Goldstone (brown goldstone)
Man-made aventurine glass, typically copper-bearing silica glass
gemstone
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Quartz (Clear/Milky)
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass
igneous
Clear quartz crystal (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Snowflake Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Snowflake Obsidian
Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)
igneous
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Tumbled quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Quartz Vein / Quartz Matrix
Silicon Dioxide (SiO2)
mineral
Feldspar in Matrix
Feldspar group minerals in metamorphic or igneous matrix
igneous
Uncertain blue-white mineral fragment
Possibly calcite or quartz; identification is limited because the specimen is tiny and partly translucent
mineral
Green sea glass or tumbled green quartz (uncertain)
Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass
mineral
Rounded quartz-rich pebble
Likely milky quartz or quartzite (SiO₂), identification uncertain from image
igneous
Muscovite Mica
Muscovite, KAl2(AlSi3O10)(OH)2
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
igneous
Tumbled black stone, likely black obsidian
Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)
igneous
Snowflake Obsidian
Spherulitic Obsidian (Volcanic Glass with Cristobalite)
igneous
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz Vein Rock
Silicon dioxide (SiO2) within a host rock matrix
mineral
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
mineral
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Green sea glass (likely bottle glass)
Man-made soda-lime silicate glass; not a natural mineral
mineral
Likely quartz-bearing rock or mineral fragment
Indeterminate; possibly quartz (SiO₂) with iron-oxide staining and darker matrix
mineral
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Synthetic material (Not a natural rock/mineral)
Muscovite Mica
Muscovite: KAl2(AlSi3O10)(OH)2
mineral
Green Quartz / Chrysoprase / Sea Glass
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica (Golden/Yellow variety)
KAl2(AlSi3O10)(F,OH)2
mineral