Blue Kyanite
Kyanite (Al2SiO5)
mineral
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Lapis Lazuli (Raw)
Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S
metamorphic
Lapis Lazuli
Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic
Coquina
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Basalt with Magnetite
Crystalline Basalt (Primarily Plagioclase and Pyroxene) with Magnetite (Fe3O4)
igneous
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Chert (Yellow/Brown Jasper)
Silicon Dioxide (SiO2)
sedimentary
Vesicular Basalt (River Pebble)
Vesicular Basalt
igneous
Noble Serpentine
Antigorite (Mg3Si2O5(OH)4)
metamorphic
Thunderegg (specifically a Jasper/Agate-filled Geode nodule)
Silicon Dioxide (SiO2) within Rhyolitic Matrix
igneous
Dalmatian Jasper (Dalmatian Stone)
Perthitic feldspar with Arfvedsonite inclusions
igneous
Ruby in Zoisite (Anyolite)
Anyolite (Combination of Corundum and Zoisite)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pumice
Pumice (Amorphous volcanic glass)
igneous
Clear Quartz crystals on a Matrix base (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Bauxite
Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)
sedimentary
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Lapis Lazuli
Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Pumice
Vesicular volcanic glass
igneous
Puddingstone
Conglomerate
Sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
mineral
Chondrite Meteorite
Ordinary Chondrite (OC)
igneous
Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Mineral/Metamorphic Substrate
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Fossiliferous Limestone with Brachiopod Mold
Calcium Carbonate (CaCO3) matrix containing Brachiopoda fossil impressions
sedimentary
Turquoise and Hematite
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Amethyst Lace Agate / Banded Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Coquina / Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Chert (Brown variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) within a nodule
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
mineral
Banded Agate (Onyx type)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Garnet
Almandine formula: Fe3Al2(SiO4)3
mineral