Magnetite (Iron Ore)
Iron(II,III) oxide (Fe3O4)
mineral
Category
Mineral (Synthetic)
Browse mineral (synthetic) specimens identified by the Rock Identifier community.
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Sandstone with Iron Staining
Clastic sedimentary rock (SiO2 with iron oxides)
sedimentary
Limonite (Iron Ore)
Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
Sardonyx Agate Sphere
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
mineral
Turquoise (set in silver jewelry)
Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Moonstone
Orthoclase feldspar ((K,Na)AlSi3O8)
mineral
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Barite Rose on Marcasite
Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)
mineral
Red Sandstone
Ferruginous Sandstone (SiO2 dominated with Fe2O3 cement)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Mineral
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
mineral
Potash (Sylvite/Potassium Feldspar)
Potassium chloride (KCl) or Orthoclase (KAlSi3O8)
mineral
Limonite with Iron Inclusions
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
sedimentary
Prehnite
Ca2Al2Si3O10(OH)2
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Geode (Unopened)
Silicon dioxide with various inclusions (SiO2)
sedimentary
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Lake Superior Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with chromium/vanadium impurities
mineral
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Gneiss
Gneiss (Metamorphic high-grade)
metamorphic
Lapis Lazuli
Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Basalt
Basalt
Igneous
Gneiss
Gneiss
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)
N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)
Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)
Chrysocolla in Cuprite (Sonoran Sunrise)
Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O) (Chrysocolla) and Cu2O (Cuprite)
mineral
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Basalt (River Rock/Cobble)
Basalt (no specific mineral formula as it's a rock)
Igneous