Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Category
Synthetic (Glass)
Browse synthetic (glass) specimens identified by the Rock Identifier community.
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Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
igneous
Muscovite Mica (with Quartz matrix)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Fulgurite
Fulgurite (Lechatelierite or fused sand/quartz)
mineral
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Likely polished dark stone or glassy mineral bead
Indeterminate; possibly obsidian, hematite, or a dark agate
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Snowflake obsidian cabochon
Obsidian (volcanic glass), SiO₂-rich; white areas are cristobalite/spherulitic devitrification
igneous
Obsidian
Volcanic Glass (SiO2 + minor impurities)
igneous
Blue chalcedony cabochon (probable)
Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂
gemstone
Chert (Flint Gravel)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Quartz (Tumbled)
Silicon Dioxide with Iron Oxide inclusions (SiO2)
mineral
Botryoidal quartz (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Muscovite Schist
KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix
metamorphic
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Snowflake Obsidian
Volcanic Glass (spherulitic obsidian)
igneous
Chert (Flint) with Limestone Coating
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) cortex
sedimentary
Sea Glass (Turquoise/Aqua)
Amorphous Silica (SiO2) with transition metal dopants
Anthropogenic (Man-made material processed by nature)
Prasiolite (Green Quartz) / Sea Glass Amalgam
SiO2 (Silicon Dioxide)
mineral
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Green Aventurine
Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Sea Glass
Amorphous silicon dioxide (glass)
mineral
Sea Glass
Silica (SiO2) - Amorphous
Mineral
Slag Glass
Amorphous Silica / Glass Slag
industrial byproduct (anthropogenic rock-like material)
Snowflake Obsidian
Obsidian with Cristobalite inclusions (70-75% SiO2)
igneous
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst Quartz fragment
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Muscovite (Mica)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic