gemstone

Larimar

Blue Pectolite (NaCa2Si3O8(OH))

AI-generated identification · may be incorrect

Hardness of 4.5-5 on the Mohs scale. Colors range from white, light-blue, green-blue to deep blue. Vitreous to silky luster. Triclinic crystal structure. Perfect cleavage in two directions.

Identified August 9, 2026More gemstone →

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Physical properties

Hardness of 4.5-5 on the Mohs scale. Colors range from white, light-blue, green-blue to deep blue. Vitreous to silky luster. Triclinic crystal structure. Perfect cleavage in two directions.

Formation & geological history

Formed in cavities and vugs of volcanic rocks (basalts and andesites) as hydrothermal fluids rich in copper replaced other minerals. Found exclusively in the Dominican Republic.

Uses & applications

Used primarily in jewelry making, carved into cabochons, beads, and pendants. Also highly sought after by mineral collectors.

Geological facts

Larimar is a rare blue variety of the mineral pectolite. Its blue color is unique to the Dominican Republic deposit and is believed to be caused by copper substituting for calcium. It was 'rediscovered' in 1974 by Miguel Méndez, who named it after his daughter Larissa and 'mar', the Spanish word for sea.

Field identification & locations

Identified by its distinctive sea-blue color and white mottling, often resembling sunlight dancing beneath Caribbean waters. Found only in the Barahona province of the Dominican Republic. Collectors should look for intense blue colors with sharp contrast against white patterns.