mineral

Larimar

Blue Pectolite (NaCa2Si3O8(OH))

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

Hardness: 4
Color: Sky blue, turquoise, blue-green with white marbling
Luster: Vitreous to silky

Identified March 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal activity in basaltic volcanic rocks where copper substituted for calcium, giving it the blue hue. Primarily formed during the Miocene epoch.

Uses & applications

Predominantly used in jewelry as cabochons, beads, and carvings. Also highly sought after by mineral collectors for its unique color and rarity.

Geological facts

It is also known as the 'Dolphin Stone' or 'Atlantis Stone.' It was discovered in 1916 but only named in 1974 by Miguel Méndez, who combined his daughter's name 'Larissa' with 'Mar' (sea).

Field identification & locations

Found exclusively in the Dominican Republic. Identified in the field by its distinct white 'patterning' against a blue background and its association with basalt. High-quality pieces are translucent when held to light.