Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Composed Of Multiple Minerals) in the encyclopedia
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Granite
Phaneritic plutonic rock (SiO2-rich)
igneous
Slate River Stone
Foliated Metamorphic Rock (composed of illite, chlorite, and quartz)
metamorphic
Slate
Foliated Metamorphic Rock (composed of quartz, illite, and chlorite)
metamorphic
Quartzite
Metamorphic Rock (composed mainly of SiO2)
metamorphic
Quartzite (River Cobble)
Metamorphic Rock (composed predominantly of SiO2)
metamorphic
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Bauxite (Iron-stained Chert / Ironstone Aggregate)
Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))
sedimentary
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Mixed rock and mineral specimen collection
Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks
mineral
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, or Chrysotile)
metamorphic
Red Granite Pebble
Intrusive Felsic Igneous Rock (Granite)
igneous
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Conglomerate (Greenstone/Pebble Conglomerate)
Polymictic Conglomerate
sedimentary
Serpentinite
Serpentinite (composed primarily of serpentine group minerals including antigorite, chrysotile, and lizardite)
metamorphic
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Rhodonite, Gray Moonstone, and White Feldspar Mix
Multiple: MnSiO3 (Rhodonite), (K,Na)AlSi3O8 (Feldspar/Moonstone)
mineral
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Sandstone
Arenite
sedimentary
Red Sandstone
Clastic sedimentary rock (often dominated by SiO2 with Fe2O3)
sedimentary
Red Sandstone
Arenite (primarily quartz with iron oxide cement)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Diorite
Intermediate plutonic igneous rock
igneous
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Gabbro
Phaneritic Mafic Plutonic Rock
igneous