mineral

Larimar (Pectolite)

NaCa2Si3O10(OH) (Sodium Calcium Silicate Hydroxide)

AI-generated identification · may be incorrect

Hardness: 4.5-5.0 on Mohs scale; Color: Blue, white, green-blue; Luster: Vitreous to silky; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.74 - 2.90

Hardness: 4
Color: Blue, white, green-blue
Luster: Vitreous to silky

Identified June 2, 2026More mineral →

Explore Larimar (Pectolite) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 4.5-5.0 on Mohs scale; Color: Blue, white, green-blue; Luster: Vitreous to silky; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.74 - 2.90

Formation & geological history

Formed as a result of volcanic activity where hydrothermal fluids rich in calcium and sodium cooled inside cavities of basaltic lavas. It is specifically a blue variety of pectolite unique to the Caribbean.

Uses & applications

Primarily used in jewelry (cabochons, beads, and pendants) and as a collector's gemstone due to its rarity and unique aesthetic.

Geological facts

Larimar is only found in one location in the entire world: the Filipinas Mine in Los Checheses, Dominican Republic. It was named by Miguel Méndez, who combined his daughter\'s name 'Larissa' and the Spanish word for sea, 'Mar'.

Field identification & locations

Identify in the field by its distinct 'sea-and-cloud' sky blue and white patterns and its occurrence within weathered basalt. Commonly found in the Dominican Republic; it is increasingly rare as deposits are depleted.