Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Processed Mineral Product) in the encyclopedia
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Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite-Hematite-Chert)
sedimentary
Turquenite (Dyed Howlite)
Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite (Concretion)
Iron(III) oxide (Fe2O3)
mineral
Limonite and Goethite encrusted Chert/Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)
sedimentary
Chalcedony (Yellow Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Hematite
Iron (III) Oxide (Fe2O3)
mineral
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Blue Onyx (Dyed Agate/Chalky Chalcedony)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Asphalt Concrete
Bituminous Concrete
sedimentary (artificial)
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Quartz Geode or Druzy Quartz in Host Rock
Silicon Dioxide (SiO2)
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Sandstone (Red Flagstone)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Tumbled Hematite
Iron(III) oxide (Fe2O3)
mineral
Red Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Bentonite Clay
Montmorillonite ((Na,Ca)0.33(Al,Mg)2Si4O10(OH)2·nH2O)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Heat-Treated Amethyst (Commercial Citrine)
Silicon Dioxide (SiO2) - Macro-crystalline Quartz
mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Epidote with quartz/feldspar
Epidote, Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Quartz with Limonite Staining
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
Mineral
Heat-Treated Citrine (Amethyst-based)
Quartz (Silicon Dioxide) - SiO2
mineral
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Slag (Industrial By-product)
Glassy silicate or metallic smelting residue
mineral-like (anthropogenic)
Yellow Ochre / Limonite
FeO(OH)·nH2O (Hydrated Iron Oxide Mix)
mineral
Epidote with Quartz
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Dyed Blue Agate (Dragon Vein Agate)
Silicon Dioxide (SiO2) with artificial cobalt/organic dyes
mineral
Pumice
Pumice (extrusive volcanic rock)
igneous
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Man-made Ceramic / Clay Figurine
Aluminosilicate Ceramic (Processed Clay)
Synthetic (not a rock or mineral)
Goethite / Limonite Gossan
Goethite, FeO(OH)
mineral
Biotite Granite
Phaneritic Felsic Igneous Rock
igneous
Goethite
Goethite (FeO(OH))
mineral