mineral

Red Coral

Corallium rubrum

Hardness: 3.5-4 on Mohs scale; Color: Red to pinkish-orange; Luster: Vitreous to dull; Crystal structure: Amorphous/Organic origin; Specific gravity: 2.6-2.7

Hardness: 3
Color: Red to pinkish-orange
Luster: Vitreous to dull

Identified May 9, 2026More mineral →

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Physical properties

Hardness: 3.5-4 on Mohs scale; Color: Red to pinkish-orange; Luster: Vitreous to dull; Crystal structure: Amorphous/Organic origin; Specific gravity: 2.6-2.7

Formation & geological history

Organic origin, secreted by marine polyps in warm coastal waters, primarily the Mediterranean Sea. Formed over dozens of years through the accumulation of calcium carbonate skeletons.

Uses & applications

Primarily used in jewelry (beads, cabochons, carvings) and as a semi-precious gemstone. Highly valued in traditional cultures for protection and healing.

Geological facts

Precise shades are known by Italian names like Rosso Scuro (dark red) or Pelle d'Angelo (angel skin). It is a protected species in many regions due to over-harvesting.

Field identification & locations

Identify by radial or wood-grain-like patterns when viewed under magnification. Look for the 'fingerprint' texture which distinguishes it from plastic or glass imitations.