Ironstone Concretion (Desert Varnish / Hematite-Goethite Nodule)
Iron oxide / hydroxide deposit (predominantly Fe2O3 and FeO(OH))
sedimentary
Category
Mineral (Processed Metal)
Browse mineral (processed metal) specimens identified by the Rock Identifier community.
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Snakeskin Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Dalmatian Stone
Dalmatian Jasper (Aplitic Perthite)
igneous
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Tiger's Eye
SiO2 (Quartz with inclusions of altered crocidolite)
metamorphic
Tiger's Eye
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
Mineral (Metamorphic pseudomorph)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Sandstone (Tafoni Weathered)
Arenite (part of the Sandstone family)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Pink Granite
Granite (Phaneritic intrusive rock)
igneous
Leopard Skin Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Blue Quartzite
Quartzite with inclusions (often Dumortierite or Magnesio-riebeckite)
metamorphic
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Rough Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Selenite (Satin Spar Variety)
Gypsum (CaSO4·2H2O)
mineral
Quartz Geode or Vuggy Quartz
Silicon Dioxide (SiO2)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions (typically Magnesio-riebeckite or Tourmaline)
mineral
Rhodochrosite in Quartz
Manganese Carbonate (MnCO3)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Aventurine
Quartz (SiO2) with iron-bearing inclusions
mineral
Lepidolite and Rubellite (Pink Tourmaline) in Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite) and Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (Elbaite/Pink Tourmaline)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Tiger's Eye
Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2
Mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Tiger's Eye (Brown/Dark variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary component
Greenstone
Greenschist
metamorphic
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral