Man Made Alloy (Metallic)

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

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2

sedimentary

Banded Iron Formation (BIF)

Banded Iron Formation

Sedimentary Rock

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Mineral

White Quartz

Quartz (SiO2)

Mineral

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

sedimentary

Red Jasper (possibly Brecciated Jasper or Bloodstone variety)

Jasper (Silicon Dioxide, SiO2)

sedimentary

Yellow Quartz (Citrine/Lemon Quartz)

Silicon Dioxide (SiO2)

mineral

Quartzite

Quartzite (SiO2)

metamorphic

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (70% or more silicon dioxide)

Igneous

Petrified Wood

Silicified wood, primarily composed of Quartz (SiO2)

Mineral, often found in sedimentary deposits

Sandstone

Clastic sedimentary rock (primarily SiO2)

sedimentary

Obsidian

Obsidian (Volcanic Glass)

igneous

Fossil Coral

Cnidaria fossil (often Calcium Carbonate / CaCO3)

sedimentary

Fossil Coral

Cnidaria Anthozoa (Fossilized)

sedimentary

Jasper Agate (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide and clay impurities

sedimentary

Chalcedony

Silicon Dioxide (SiO2)

mineral

Fossilized Crab Carapace (Concretion)

Decapoda (fossil), typically preserved in calcite or siderite concretion

sedimentary

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O

mineral

Jasper (Red Chert)

Jasper (Silicon Dioxide, SiO2)

sedimentary

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

mineral

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

mineral

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

Mineral, specifically an iron ore

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Mineral