mineral
Carbonado (Black Diamond)
Carbonado (Polycrystalline Diamond)
AI-generated identification · may be incorrectHardness: 10 (Mohs scale), Color: Black or dark grey, Luster: Adamantine to greasy, Crystal structure: Cubic (polycrystalline aggregate), Cleavage: None (unlike monocrystalline diamond), Specific gravity: 3.1 to 3.4
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Physical properties
Hardness: 10 (Mohs scale), Color: Black or dark grey, Luster: Adamantine to greasy, Crystal structure: Cubic (polycrystalline aggregate), Cleavage: None (unlike monocrystalline diamond), Specific gravity: 3.1 to 3.4
Formation & geological history
Found in alluvial deposits in Brazil and Central African Republic. Origin theories include formation in stellar supernovae or high-pressure impacts on Earth. Estimated age is 2.6 to 3.8 billion years old.
Uses & applications
Used primarily in industrial applications for abrasive tools, drill bits, and as unique gemstones in jewelry.
Geological facts
Carbonado is exceptionally tough compared to conventional diamonds because its polycrystalline structure prevents the propagation of cleavage fractures. It contains traces of nitrogen and hydrogen that suggest an extraterrestrial origin.
Field identification & locations
Identify by its dark, porous (vesicular) appearance and extreme hardness. Look for a metallic or glassy sheen on broken edges. Commonly found in river sediments in South America and Africa.
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