Man Made Alloy (Metallic)

Browse man made alloy (metallic) specimens identified by the Rock Identifier community.

Barite

Barium Sulfate (BaSO4)

mineral

Basalt

igneous

Pyrite

Pyrite (Iron Disulfide), FeS2

Mineral

African Turquoise (Jasper)

Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)

Rock

Galena

Galena (Lead Sulfide), PbS

mineral

Rutilated Quartz

SiO2 with TiO2 inclusions

Mineral

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Sedimentary

Sandstone (with possibly iron oxides and other minerals)

Sandstone

Sedimentary rock

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)

Fluorite (CaF2)

Mineral

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Mineral

Schist

metamorphic

Rutilated Quartz (or Tourmalinated Quartz if inclusions are Tourmaline)

Silicon Dioxide (SiO2) with Rutile (TiO2) or Tourmaline inclusions

Mineral

Fuchsite Quartzite

Fuchsite-bearing Quartzite

Metamorphic

Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)

Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)

Mineral for Fluorite; Mineral/Rock for Jadeite (as it's often a rock composed primarily of jadeite mineral)

Dog (Sleeping)

Canis familiaris (or Canis lupus familiaris)

Organic/Biological

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

Greisen (Quartz-Muscovite-Turretine Rock)

Greisen

Metamorphic Rock

Sodalite

Sodalite (Sodium Aluminum Silicate Chloride), Na8(Al6Si6O24)Cl2

Mineral

Granite

Granite (a plutonic igneous rock)

Igneous

Rutilated Quartz (beads)

SiO2 with TiO2 inclusions (Titanium Dioxide inclusions within Quartz)

Mineral

Granite

Granite (a felsic intrusive igneous rock)

Igneous rock

Sunstone and Green Aventurine

Sunstone: (Ca,Na)[(Al,Si)2Si2O8] (Plagioclase Feldspar Group); Green Aventurine: SiO2 (Quartz)

Mineral

Rutile in Quartz (Rutilated Quartz)

SiO2 with TiO2 inclusions

Mineral

Banded Iron Formation

Banded Iron Formation (BIF)

sedimentary

Hematite

Hematite (Fe2O3)

mineral

Anthracite Coal

Anthracite (a form of coal, primarily carbon)

sedimentary

Cinnabar

Cinnabar (HgS)

mineral

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Mineral

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Igneous