Sandstone
Arenite (primarily Quartz-based)
sedimentary
Category
Igneous, Sedimentary, Or Metamorphic (Mineral Based)
Browse igneous, sedimentary, or metamorphic (mineral based) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 based typically)
sedimentary
Mica (Muscovite)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartzite River Rock
Quartzite (SiO2 based metamorphic rock)
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Slate
Phyllo-silicate based metamorphic rock
metamorphic
Labradorite
Plagioclase Feldspar (Ca,Na)(Al,Si)4O8
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Peacock Ore (Bornite or Chalcopyrite treated with acid)
Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Biotite Schist
Biotite-rich Schist
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (SiO2 based with Fe2O3 banding)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Yellow Calcite
Calcium Carbonate, CaCO3
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)
Quartz (Pink / Ferruginous)
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Greenschist (Chlorite Schist)
Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)
metamorphic
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Biotite Schist
Schist (Biotite-dominated)
metamorphic
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Mixed collection of common river stones
Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material
igneous, sedimentary, metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Geode or Concretion
Silica-based Concretion / Quartz Geode
sedimentary
Red Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
River Pebble (likely Quartzite or Siltstone)
Sedimentary Clast (SiO2 based)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Rough Green Sapphire (Corundum)
Corundum (Al2O3 - Aluminum Oxide with trace elements)
mineral