Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Category
Manufactured Glass
Browse manufactured glass specimens identified by the Rock Identifier community.
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt
Mafic volcanic rock (Primary minerals: Plagioclase feldspar, Pyroxene)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Chalk
Micrite (primarily Calcium Carbonate, CaCO3)
sedimentary
Siltstone
Siltstone (primarily composed of SiO2)
sedimentary
Snowflake Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Bituminous Coal
Bituminous coal (Organic Sedimentary Rock)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
sedimentary
Pyrite (on Quartz/Sulfide matrix)
Iron Sulfide (FeS2)
mineral
Basalt
Basalt
igneous
Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3) in Quartz (SiO2)
metamorphic
Orange Satin Spar (Satin Spar Selenite)
Satin Spar - Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Green Kyanite
Kyanite (Al2SiO5)
mineral
Brecciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Crystal
Quartz (SiO₂)
Mineral
Opalite
Synthetic Glass (Simulated Opal)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
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
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)
Chert (often called Flint or River Pebble)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Muscovite Mica (with Quartz)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
mineral group
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Sea Glass
Amorphous Silica (SiO2) with various additives
Mineraloid (Anthropogenic)
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid