gemstone

Larimar

Pectolite (NaCa2Si3O8(OH))

Hardness of 4.5 to 5 on the Mohs scale, varying shades of blue to greenish-blue with white pattern striations resembling sunlight dancing on water, silky to vitreous luster, triclinic crystal system, perfect cleavage in two directions, specific gravity around 2.74 - 2.88.

Identified August 4, 2026More gemstone →

Explore Larimar in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed within cavities in volcanic basalt flows through hydrothermal activity where hot fluids rich in minerals crystallized. Found almost exclusively in the Dominican Republic, particularly in the Barahona province, dating back to Miocene volcanic activity.

Uses & applications

Primarily used in high-end jewelry such as rings, pendants, and earrings, as well as a sought-after collector and lapidary specimen.

Geological facts

Also known as the 'Atlantis Stone', larimar was discovered in its modern form in 1974 by a Peace Corps volunteer and a local Dominican, though locals knew of it before. Its unique ocean-like patterns make it one of the most distinctive blue gemstones in the world.

Field identification & locations

Easily identified by its unique mottled oceanic blue and white turtle-back or wave patterns. Found primarily as pebbles in riverbeds or within basalt cavities in the Dominican Republic. Collectors look for high contrast, deep blue saturation, and minimal matrix inclusions.