Gold Placer (Gold Flakes and Nuggets)
Native Gold (Au)
mineral
Category
Metamorphic Or Igneous (Context Dependent)
Browse metamorphic or igneous (context dependent) specimens identified by the Rock Identifier community.
Turquoise
Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Emerald in Matrix
Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6
mineral
Chert (Flint variety)
Microcrystalline context of Quartz (SiO2)
sedimentary
Porphyry
Porphyritic Andesite/Basalt
igneous
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Slag (Industrial)
N/A (Anthropogenic Slag)
industrial by-product
Rose Quartz
Silicon Dioxide with trace inclusions of dumortierite or titanium (SiO2)
mineral
Sandstone (Water-worn Cobble)
Arenite (variable composition, primarily SiO2)
sedimentary
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Massive Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Jasper
Agate/Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Mica (Biotite or Phlogopite variety)
Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)
mineral
Seraphinite
Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.
Mineral
Granite
Granite (a common type of Felsic Intrusive Igneous Rock)
Igneous Rock
Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)
Calcite
Mineral
Basalt (Crushed Stone)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Pyrite on Quartz (Fool's Gold in Quartz)
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Ruby
Corundum (Al₂O₃) with Chromium (Cr)
Mineral (gemstone)
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Iron-Nickel Meteorite fragment
Siderite (meteoritic iron), composed primarily of Kamacite (α-(Fe,Ni)) and Taenite (γ-(Fe,Ni))
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary/mineral
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Black Jasper
Black Jasper (Silicate mineral - SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Ruby
Corundum (Al2O3:Cr)
mineral
Red Sandstone
Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Metamorphic Rock / Mineral
Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Mineral/Metamorphic Substrate