Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2)
igneous
Category
Glass
Browse glass specimens identified by the Rock Identifier community.
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Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Muscovite Mica (likely on Quartz/Feldspar)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Muscovite Mica Schist
Muscovite Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Muscovite Schist
Mica Schist (primarily KAl2(AlSi3O10)(OH)2)
metamorphic
Muscovite Schist
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Sea Glass (Frosted Glass)
Amorphous Silica (SiO2) with various metal oxide impurities
Man-made material (Anthro-lithic product)
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Obsidian
Obsidian (Volcanic Glass)
igneous
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Obsidian
Obsidian (Volcanic Glass)
igneous
Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Snowflake Obsidian
Spherulitic Obsidian (Amorphous Volcanic Glass with Cristobalite inclusions)
igneous
Chert (often called Flint or River Pebble)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Green Aventurine
SiO2 (Silicon Dioxide with Fuchsite inclusions)
mineral
Muscovite Mica (with Quartz)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Obsidian
Obsidian (Volcanic glass, primarily SiO2)
igneous
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
mineral group
Green Aventurine
Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica (in Quartz/Feldspar Matrix)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Chert (specifically Gray Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Mica (Muscovite)
Potassium aluminum silicate - KAl2(AlSi3O10)(OH)2
mineral
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70–75% SiO2)
igneous
Snowflake Obsidian
Volcanic Glass (SiO2) with Cristobalite inclusions
igneous
Goldstone
Aventurine Glass (SiO2 + Cu small inclusions)
man-made glass mineral simulant
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Slag Glass
Silicon dioxide with impurities
mineral
Muscovite Mica (on Quartz Matrix)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Snowflake Obsidian (Polished Cabochon)
Obsidian with Spherulitic Cristobalite (SiO2)
igneous
Rhinestone
Artificial Glass/Crystal
gemstone
Obsidian with Mahogany Phasing
Volcanic Glass (SiO2 + Fe2O3)
igneous