Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Category
Metal (Elemental Mineral)
Browse metal (elemental mineral) specimens identified by the Rock Identifier community.
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
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (containing secondary minerals like Quartz, Zeolites, or Calcite)
igneous
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
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
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Onyx
Chalcedony (SiO2) with parallel banding
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Gold
Aurum (Au)
Mineral (Metal)
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
Limonite and Goethite (Ironstone)
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
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
Cubic Zirconia (Simulated Diamond)
Zirconium Dioxide (ZrO2)
mineral (synthetic)
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)
Rainbow Hematite (Titanium Coated)
Iron(III) oxide (Fe2O3) with Titanium/Metal Oxide coating
mineral