Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Category
Minerals
Browse minerals specimens identified by the Rock Identifier community.
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River Stone (composed of Siltstone/Basalt mixture)
Siltstone or microcrystalline Basalt pebble
sedimentary
Limonite (Iron Ore)
Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)
mineral
Scoria with Calcite Infills
Vesicular Basalt with secondary Calcification (CaCO3)
igneous
Jade (likely Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Mineral
Granite
Granite (a felsic intrusive igneous rock)
Igneous rock
Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
igneous and metamorphic
Banded Gneiss
Gneiss (pronounced "nice")
Metamorphic Rock
Gossanous Sandstone (likely Terrestrial)
Arenite with Iron-Oxide inclusions
sedimentary
Blue Lace Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Clear Quartz
Silicon dioxide (SiO2)
mineral
Spiny Oyster Shell
Spondylus (Calcium Carbonate, CaCO3)
mineral
Brimstone (Native Sulfur)
Native Sulfur (S)
mineral
Malachite
Malachite - Cu2CO3(OH)2
mineral
Limonite/Hematite Ironstone
Goethite-rich Ironstone (FeO(OH) · nH2O)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Himalayan Pink Salt (Halite)
Halite (Sodium Chloride, NaCl)
sedimentary
Granite
Granite
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infillings (SiO2, (Ca,Na)2-3(Mg,Fe,Al)5Si8O22(OH)2)
igneous
Greenschist
Greenschist (Chlorite Schist)
metamorphic
Green Moss Agate (Tumbled)
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineralogical glass/meteorite impactite
Granite Thin Section
Granitic rock (Phaneritic texture)
igneous
Biotite Schist with Garnet
Garnet-Biotite Schist
metamorphic
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly SiO2 or Zeolites)
igneous
Septarian Nodule
Septaria (composed of Calcite, Aragonite, and Limestone)
sedimentary
Gossan
Ferruginous gossan (Iron-rich capping)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Granite (Core Sample)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Diorite
Phaneritic intermediate intrusive igneous rock
igneous
Sapphirine in Matrix
Sapphirine (Mg,Al)8(Al,Si)6O20
mineral
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Moonstone
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8)
mineral
Green Quartzite
Quartzite (SiO2 with inclusions)
metamorphic
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Pink Quartz Grains
Silicon Dioxide (SiO2)
mineral