Clear quartz fragment (rock crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Category
Mineral Simulant (Synthetic Glass)
Browse mineral simulant (synthetic glass) specimens identified by the Rock Identifier community.
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Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Black Obsidian
Volcanic glass
igneous
Obsidian
Volcanic Glass
igneous
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Raw pale-green crystal, likely fluorite
Fluorite (calcium fluoride, CaF₂)
mineral
Aura Quartz (Titanium/Rainbow Quartz)
SiO2 (Silicon Dioxide) with metallic coating
mineral
Snowflake obsidian cabochon
Obsidian (volcanic glass), SiO₂-rich; white areas are cristobalite/spherulitic devitrification
igneous
Green Aventurine
Aventurine Quartz (SiO2 + Fuchsite mica)
Mineral
White tumbled stone, likely quartz or calcite
Indeterminate; possibly quartz (SiO₂) or calcite (CaCO₃)
mineral
Crackle Glass (Simulated Gemstone)
Amorphous Solid (SiO2)
man-made glass
Green Aventurine
SiO2 (Silicon Dioxide with Fuchsite inclusions)
mineral
Snowflake Obsidian
Spherulitic Obsidian (Amorphous Volcanic Glass with Cristobalite inclusions)
igneous
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
mineral group
Obsidian
Obsidian (Volcanic glass, primarily SiO2)
igneous
Likely polished quartz or glass-like mineral cabochon
Probably quartz (SiO₂), though the image cannot exclude man-made glass
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Blue goldstone
Man-made aventurine glass containing metallic copper particles; not a natural mineral
mineral
Muscovite Mica Schist
Muscovite Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Muscovite Schist
Mica Schist (primarily KAl2(AlSi3O10)(OH)2)
metamorphic
Green glassy mineral specimen, likely nephrite or serpentine
Indeterminate from image; possible nephrite jade (interlocking amphibole, chiefly Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂) or green serpentine (Mg₃Si₂O₅(OH)₄)
mineral
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Tumbled amber-brown quartz (probable smoky quartz or carnelian)
Quartz, SiO₂; color may reflect iron impurities or irradiation
mineral
Blue slag glass or dyed glass-like industrial material
Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass
mineral
Pink Quartz / Sea Glass
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Brown variety)
Silicon dioxide (SiO2)
mineral
Libyan Desert Glass
Libyan Desert Glass (Tektite / Impact Glass)
meteorite
Slag Glass (Cullet Glass)
Amorphous Silica (Industrial byproduct)
mineral
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2 with Cristobalite inclusions)
igneous
Raw Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass (Mainly SiO2)
igneous
Obsidian
Volcanic glass
igneous
Tumbled green-blue glassy mineral, possibly fluorite or aventurine
Uncertain from image; possible fluorite (CaF₂) or quartz aventurine (SiO₂)
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (SiO2)
igneous
Likely polished dark stone or glassy mineral bead
Indeterminate; possibly obsidian, hematite, or a dark agate
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Quartz with Associated Minerals
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral