Yellow Jasper
Chalcedony (SiO2) with goethite or limonite inclusions
sedimentary
Category
Mineral (Native Element Alloy)
Browse mineral (native element alloy) specimens identified by the Rock Identifier community.
Fuchsite Quartzite
Fuchsite-bearing Quartzite
Metamorphic
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS) with Quartz (SiO2)
Mineral in a Metamorphic/Hydrothermal rock
Cupronickel Coin
Copper-Nickel Alloy (typically 75% Cu, 25% Ni)
anthropic metallic specimen
Iron Meteorite (Campo del Cielo)
Iron Meteorite, Group IAB (FeNi Alloy: Kamacite and Taenite)
igneous
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcopyrite
Chalcopyrite (CuFeS2)
Mineral
Crinoid Stem Fossil
Class Crinoidea (Phylum Echinodermata), primarily Calcium Carbonate (CaCO3)
sedimentary
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Thunderegg (Ate Agate/Jasper Geode)
Silicon Dioxide (SiO2) within Rhyolite/Perlite matrix
sedimentary/igneous intermediary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Apache Tear (Obsidian)
Obsidian / Amorphous Volcanic Glass (primarily SiO2)
igneous
Pallasite Meteorite
Pallasite (Stony-iron meteorite; Fe-Ni alloy with (Mg,Fe)2SiO4 olivine)
Mineral/Extraterrestrial Rock
Sulfur on Aragonite
Sulfur (S) and Aragonite (CaCO3)
Mineral
Chert (Jasper/Quartzite variety)
Microcrystalline Silica (SiO2)
sedimentary
Iron Meteorite
Siderite (Fe, Ni)
igneous
Iron Meteorite (likely Chondrite or Iron-Nickel fragment)
Siderite (Iron Meteorite), primarily Fe-Ni (Iron-Nickel) alloy
igneous
Diamond
Carbon (C), specifically a solid form of the element carbon with atoms arranged in a crystal structure called diamond cubic.
Mineral
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Black Chert
Chert (microcrystalline quartz)
Mineral
Red Jasper
Jasper (a variety of Chalcedony, SiO₂)
Mineraloid (cryptocrystalline quartz)
Turquoise
Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)
Mineral
Soapstone
Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)
Metamorphic Rock
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Pyrite
Pyrite (Iron sulfide, FeS₂)
Mineral
Gold (Processed)
Gold (Au)
Metal (Elemental Mineral)
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
sedimentary
Puddingstone (Jasper Conglomerate)
Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)
Sedimentary
Unable to identify - Image contains non-geological items
N/A
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Limonite and Goethite on Gossan
FeO(OH)·nH2O
mineral
Spinosaurus fossil (permineralized bone)
Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)
sedimentary
Calcite (Yellow/Orange variety - sometimes called Honey Calcite)
Calcite
Mineral
Fluorite (Purple Fluorite in Matrix)
Fluorite (Calcium Fluoride, CaF2)
mineral
Lepidolite with Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Fluorite (Polished Point/Tower)
Calcium Fluoride (CaF2)
mineral