Magnetite (Octahedral Crystal)
Magnetite (Fe3O4)
mineral
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, Quartzite, and River Pebbles
Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures
Sedimentary and Metamorphic
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Chert (Cream Variety)
Microcrystalline silica (SiO2)
sedimentary
Quartz (Rose Quartz or Jasper variety)
Silicon Dioxide (SiO2)
mineral
Mica
Phyllosilicate (group name), typically Muscovite KAl2(AlSi3O10)(OH)2 or Biotite K(Mg,Fe)3(AlSi3O10)(OH)2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Biotite (Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Ruby and Sapphire Cluster Ring
Corundum (Al2O3)
gemstone
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Muscovite mica
Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂
mineral
Sandstone
Arenite (typically SiO2 based)
sedimentary
Greenstone
Metabasalt / Chlorite Schist
metamorphic
Red Sandstone
Arenite (SiO2 based with Fe2O3)
sedimentary
Hypersthene
Enstatite (Hypersthene variety), (Mg,Fe)SiO3
mineral
Dalmatian Jasper
Peralkaline Quartz-Feldspar Igneous Rock with Arfvedsonite
igneous
Mica (Muscovite) in Granite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Amethyst crystal
Silicon Dioxide (SiO2) with iron impurities
mineral
Bumblebee Jasper
Calcite with Arsenic and Sulfur inclusions
sedimentary
Quartz with Mica (Muscovite or Biotite)
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(F,OH)2
mineral
Anthracite Coal
Anthracite (Carbon-based sedimentary rock typically classified as metamorphic)
metamorphic
Tiger Carving (Banded Onyx or Calcite)
Banded Calcite (CaCO3)
sedimentary
Sandstone (likely Calcareous or Quartz-rich)
Arenite (SiO2 based typically)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Cobble
Quartzite (SiO2 based)
metamorphic
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Mixed mineral and rock collection
Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones
mineral
Hag Stone (Holed Quartzite Pebble)
Quartzite (SiO2 based) with natural vug or erosion hole
sedimentary/metamorphic
Biotite / Black Mica
K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Mica Schist fragment
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Sandstone
Arenite (SiO2 based typically)
sedimentary
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
mineral
Granitoid (Granite/Gneiss mix)
Granite or Granitic Gneiss (Silicon dioxide SiO2 with Al, K, Na silicates)
igneous/metamorphic