Silver (Jewelry Specimen)
Native Silver (Ag)
Mineral (Native Element)
Category
Mineral (Processed Metal)
Browse mineral (processed metal) specimens identified by the Rock Identifier community.
Green Sea Glass
Amorphous Silica (man-made glass), SiO2 + additive metal oxides
mineraloid / anthropogenic (man-made origin)
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Mica)
mineral
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Granite
Plutonic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Amethyst (as seen in jewelry)
Amethyst (Silicon Dioxide SiO2 + Fe4+)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite with Iron Hydroxide Staining
Quartzite (primarily SiO2) with Limonite/Goethite staining
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (containing secondary minerals like Quartz, Zeolites, or Calcite)
igneous
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Chert (specifically Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Gold and Silver (in jewelry form)
Gold (Au) and Silver (Ag)
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Onyx
Chalcedony (SiO2) with parallel banding
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Gold
Aurum (Au)
Mineral (Metal)
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Banded Black Onyx (Chalcedony)
Silicon Dioxide (SiO₂)
mineral
Dalmatian Stone (commonly called Dalmatian Jasper)
Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)
igneous
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
Quartz (Silicon Dioxide - SiO2)
Mineral
Limonite and Goethite (Ironstone)
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, chrysotile, or antigorite; Mg3Si2O5(OH)4)
metamorphic
Opalite
Man-made opalescent glass (SiO2 + metal oxides)
mineral (synthetic)
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Granite
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)
igneous
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)