Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Category
Mineral (Synthetic Glass)
Browse mineral (synthetic glass) specimens identified by the Rock Identifier community.
Learn about Mineral (Synthetic Glass) in the encyclopedia
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Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-rich pegmatite specimen
Hydrothermal/pegmatitic quartz aggregate, chiefly SiO₂, with probable feldspar and mica/accessory sulfides
igneous
Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation
Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Tumbled blue glassy mineral specimen, possibly blue calcite or dyed quartz
Uncertain from image; likely calcite (CaCO₃) or dyed microcrystalline quartz (SiO₂)
mineral
Goldstone (brown goldstone)
Man-made aventurine glass, typically copper-bearing silica glass
gemstone
Snowflake Obsidian
Volcanic Glass (SiO2 rich with Cristobalite inclusions)
igneous
Obsidian
Volcanic Glass (SiO2 + minor impurities)
igneous
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Green sea glass (likely bottle glass)
Man-made soda-lime silicate glass; not a natural mineral
mineral
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Milky quartz (rough quartz fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Botryoidal quartz (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Amethyst chip or tumbled fragment
Quartz, SiO₂; purple coloration from trace iron and irradiation
mineral
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
igneous
Obsidian
Obsidian (principally SiO2 - Silicon Dioxide)
igneous
Blue glassy gemstone-like specimen
Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass
gemstone
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (mostly SiO2)
igneous
Obsidian
Volcanic Glass
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Snowflake Obsidian
Volcanic Glass (SiO2 with Cristobalite inclusions)
igneous
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Smoky quartz crystal
Quartz (silicon dioxide, SiO₂), likely smoky quartz
mineral
Snowflake Obsidian
Volcanic Glass (felsic volcanic glass with cristobalite inclusions)
igneous
Polished chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂; chalcedony with possible iron-oxide and/or manganese dendrites
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Feldspar (Microcline / Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Clear quartz crystal (likely quartz bead/specimen)
Quartz, silicon dioxide (SiO₂)
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Synthetic material (Not a natural rock/mineral)
Blue glassy fragment among beach gravel
Likely cobalt-blue man-made glass; not a natural mineral specimen
mineral
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
Igneous
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Green glass cabochon or tumbled stone
Indeterminate; likely man-made glass, possibly aventurine glass rather than a natural mineral
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Green Fluorite (Botryoidal/Massive)
Calcium Fluoride (CaF2)
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous