Quartzite with Iron Hydroxide Staining
Quartzite (primarily SiO2) with Limonite/Goethite staining
metamorphic
Category
Metal (Elemental Mineral)
Browse metal (elemental mineral) specimens identified by the Rock Identifier community.
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Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Turquoise cabochon jewelry
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Gold
Aurum (Au)
Mineral (Metal)
Quartz Vein in Granite
Crystalline Silicon Dioxide (SiO2) in Granitic Matrix
mineral/igneous
Gold and Silver (in jewelry form)
Gold (Au) and Silver (Ag)
mineral
Gossan (Iron Hat)
Goethite-Hematite rich weathered rock (Fe-hydroxides)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Diorite
Intermediate intrusive igneous rock
igneous
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Diamond (in Jewelry)
Diamond (Carbon, C)
mineral
Hematite (Iron Ore Boulder)
Hematite (Fe2O3)
mineral
Vesicular basalt (weathered lava rock)
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine (mafic volcanic rock)
igneous
Likely weathered basalt or mafic volcanic rock
Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Chert (specifically Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-rich pegmatite with green mica or chlorite
Granitic pegmatite; chiefly quartz (SiO₂), with feldspar and probable muscovite/chlorite
igneous
Diamond (in a jewelry setting)
Carbon (C)
mineral
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Mystic Topaz
Al2SiO4(F,OH)2 (Coated)
gemstone
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Dyed blue howlite (turquoise imitation), possibly dyed magnesite
Howlite: Ca₂B₅SiO₉(OH)₅; the vivid blue color is artificial dye. Exact identification is uncertain from the photograph alone.
gemstone
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Onyx
Chalcedony (SiO2) with parallel banding
mineral
Banded Black Onyx (Chalcedony)
Silicon Dioxide (SiO₂)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (containing secondary minerals like Quartz, Zeolites, or Calcite)
igneous
Gold Nugget
Native Gold (Au)
mineral
Blue slag glass or dyed glass-like industrial material
Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Titanium Amethyst Geode
Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer
mineral
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Milk Quartz (Vein Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
metamorphic
Rainbow Hematite (Titanium Coated)
Iron(III) oxide (Fe2O3) with Titanium/Metal Oxide coating
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic