mineral

Pink Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

AI-generated identification · may be incorrect

Hardness: 3.5-4.0 (Mohs); Color: Pale pink to salmon; Luster: Vitreous/waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.7

Hardness: 3
Color: Pale pink to salmon
Luster: Vitreous/waxy

Identified April 17, 2026More mineral →

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Physical properties

Hardness: 3.5-4.0 (Mohs); Color: Pale pink to salmon; Luster: Vitreous/waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.7

Formation & geological history

Organic origin formed by sea polyps in deep ocean environments. Ancient reefs can date back millions of years, often sourced from the Mediterranean or Japanese waters.

Uses & applications

Primarily used in jewelry (beads, cabochons, carvings) and as decorative collectibles. Historically used in amulets.

Geological facts

Coral is an organic gemstone, meaning it is produced by a living organism rather than a geological process. Precious pink coral is slow-growing and often protected by international laws (CITES).

Field identification & locations

Identify by looking for a faint wood-grain or wavy fibrous pattern under magnification; it will react (effervesce) with weak acid like vinegar due to its calcium carbonate base.