Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
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N/A
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Jade (likely Jadeite or Nephrite)
Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral/Mineraloid
Basalt with Epidote (Greenstone)
Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Granodiorite
Granodiorite
igneous
Gneiss (specifically a granitic gneiss cobble)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')
Silicon Dioxide (SiO2) with artificial pigment
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone Concretion with Quartz Center
Sedimentary Clastic Rock (SiO2 matrix with Quartz core)
sedimentary
Sandstone
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Porphyritic Igneous Rock / Granite or Rhyolite Porphyry
Porphyritic intrusive/extrusive igneous rock
igneous
Petrified Coral Fossil (Honeycomb Coral)
Favosites (Rugosa/Tabulate coral fossil replaced by microcrystalline quartz/chalcedony)
fossil
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Satin Spar Selenite
Fibrous Gypsum (CaSO4·2H2O)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
mineral
Sandstone (Quartzite texture)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Dalmatian Stone
Peralkaline rhyolite
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Lepidolite with Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Quartz Vein / Quartzite with Iron Oxide Staining
Silicon Dioxide (SiO2)
mineral
Quartz-rich pegmatite or quartz vein rock
Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining
igneous
Gneiss
Gneiss (quartz-feldspar-biotite gneiss)
metamorphic
Gneiss
Metamorphic rock of high-grade regional metamorphism
metamorphic
Chalcedony (River Stone)
Microcrystalline Quartz (SiO2)
mineral
Lapis Lazuli (in Matrix)
Lazurite-bearing Metamorphic Rock (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
metamorphic
Granite, possibly granodiorite
Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende
igneous
Iron Ore (Magnetite-Hematite)
Magnetite (Fe3O4) and Hematite (Fe2O3)
mineral
Red Sandstone
Arenite (Fe2O3 rich)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
gemstone
Sandstone (with Iron Staining)
Arenite (SiO2 with Fe2O3/FeOOH impurities)
sedimentary
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary
Vanadinite on Barite
Pb5(VO4)3Cl (Vanadinite) with BaSO4 (Barite)
mineral
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz Vein
Silicon Dioxide (SiO2)
Mineral
Sandstone (Ferruginous)
Arenite with Hematite cement (SiO2 + Fe2O3)
sedimentary