Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Category
Mineral (Tectosilicate)
Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.
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Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Ironstone (with Limonite/Goethite)
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)
sedimentary
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Desert Rose (Sand Barite/Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrated Calcium Sulfate (CaSO4·2H2O)
mineral
Botryoidal Goethite
Goethite (α-Fe3+O(OH))
mineral
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Desert Rose (Gypsum/Baryte)
Hydrated Calcium Sulfate (CaSO4·2H2O)
mineral
Quartz Geode with Goethite/Hematite
Silicon Dioxide (SiO2) with Iron Oxides
mineral
Fire Opal in Host Rock
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Malachite with Chrysocolla
Copper carbonate hydroxide (Cu2CO3(OH)2) and Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Smoky Quartz (Herkimer-style)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Conglomerate
Conglomerate
Sedimentary Rock
Basalt
Basalt
igneous
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
![Chakra Tumbled Stone Set (Various (including Amethyst [SiO2], Sodalite [Na8(Al6Si6O24)Cl2], Green Aventurine [SiO2], Red Jasper [SiO2], etc.)) — Mineral](https://media.rockidentification.com/c025d744-4fd6-4228-875c-6949749bbae3-thumbnail.jpg)
Chakra Tumbled Stone Set
Various (including Amethyst [SiO2], Sodalite [Na8(Al6Si6O24)Cl2], Green Aventurine [SiO2], Red Jasper [SiO2], etc.)
Mineral
Granitic Pegmatite
Granitic Pegmatite (principally Quartz, Potassium Feldspar, and Mica)
igneous
N/A (Non-Geological Specimen)
N/A
Fossilized Shark Tooth (Otodus)
Otodus sp. (calcium phosphate/hydroxylellite)
sedimentary
Green Aura Quartz (Titanium treated Kyanite or Quartz)
Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating
mineral (man-made aura treatment)
Calamites
Calamites (Pith cast fossil)
sedimentary
Tiger's Eye
Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2
metamorphic
Sandstone (likely River-tumbled Picture Sandstone)
Arenite (predominantly SiO2 with iron oxide impurities)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral