mineral

Diamond (likely facet or crystal shard)

Diamond (C)

Hardness: 10 (Mohs scale); Color: Colorless to faint yellow; Luster: Adamantine; Crystal system: Isometric-Hexoctahedral; Specific Gravity: 3.51

Hardness: 10 (Mohs scale)
Color: Colorless to faint yellow
Luster: Adamantine

Identified July 6, 2026More mineral →

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Physical properties

Hardness: 10 (Mohs scale); Color: Colorless to faint yellow; Luster: Adamantine; Crystal system: Isometric-Hexoctahedral; Specific Gravity: 3.51

Formation & geological history

Formed at high pressure and temperature in the Earth's mantle (140-190 km deep), brought to surface by kimberlite eruptions. Geological age ranges from 1 to 3.5 billion years.

Uses & applications

High-end jewelry, industrial abrasives, cutting tools, and investment collecting.

Geological facts

Diamond is the hardest naturally occurring substance on Earth and consists of pure carbon atoms arranged in a crystal lattice.

Field identification & locations

In the field, look for octahedral crystal shapes or high refractive index. Often found in primary deposits like kimberlite pipes or secondary alluvial gravels.