gemstone

Tumbled larimar

Larimar; blue pectolite, NaCa₂Si₃O₈(OH)

AI-generated identification · may be incorrect

Typically pale blue to blue-green with white, cloudy or fibrous patterns; vitreous to silky luster and triclinic crystals. Mohs hardness is about 4.5–5, with imperfect cleavage and specific gravity near 2.8–2.9.

Identified August 25, 2026More gemstone →

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Physical properties

Formation & geological history

A rare volcanic-hydrothermal pectolite formed in cavities and fractures of basalt, commonly associated with zeolites and calcite. Gem-quality material is chiefly Cretaceous–Tertiary volcanic rock from the Dominican Republic.

Uses & applications

Used for cabochons, beads, carvings, and polished collectibles; its moderate softness makes it unsuitable for high-wear rings. Small tumbled pieces are commonly sold as ornamental or metaphysical stones.

Geological facts

Its distinctive blue color is caused mainly by copper-related chemistry, while white areas are pectolite or associated minerals. Larimar is a trade name, not a separate mineral species.

Field identification & locations

Identify it by its sky-blue color, white cloudlike or radiating pattern, and relatively soft surface; turquoise, dyed howlite, and blue calcite are common look-alikes. The principal locality is Los Chupaderos near Barahona, Dominican Republic.