mineral

Larimar

Pectolite (Blue variety), NaCa2Si3O10(OH)

Hardness: 4.5–5.0 Mohs; Color: Sky blue to deep blue with white patterning; Luster: Vitreous to silky; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.7–2.9

Hardness: 4
Color: Sky blue to deep blue with white patterning
Luster: Vitreous to silky

Identified May 3, 2026More mineral →

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Physical properties

Hardness: 4.5–5.0 Mohs; Color: Sky blue to deep blue with white patterning; Luster: Vitreous to silky; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.7–2.9

Formation & geological history

Formed in volcanic cavities where hydrothermal fluids high in calcium and sodium crystallized. The unique blue color is caused by copper substitution for calcium. It is primarily found in Miocene-aged basaltic rocks (approx. 20 million years old).

Uses & applications

Predominantly used as a gemstone in jewelry (cabochons, beads, rings) and as a high-value collector's mineral due to its rarity.

Geological facts

Larimar is found in only one place in the world: the Filipinas Mine in Los Chupaderos, Dominican Republic. It was originally discovered in 1916 but rediscovered in 1974 and named after the discoverer's daughter (Larissa) and the Spanish word for sea (mar).

Field identification & locations

Identify by its distinctive 'volcanic' bubbling or wispy white patterns against a blue background. In the field, look for weathered basalt containing blue nodules. Collectors often look for intense 'volcano blue' colors with minimal brown or red inclusions.