Larimar
Pectolite var. Larimar · Semi-Precious Gemstone / Collector Mineral
Crystal System
Triclinic; typically found in massive or globular (pectinated) habits rather than distinct individual crystals.
Mineral Group
Silicates (Inosilicates - Pyroxenoid group)
Chemical Formula
NaCa2Si3O8(OH) with trace amounts of Copper (Cu)
Formation Process
Hydrothermal; formed when copper-rich fluids circulated through cavities and basaltic fissures in volcanic pipes (andesitic or basaltic rocks).
About This Crystal
A translucent to opaque sky-blue, sea-blue, or teal stone often featuring white 'cloud-like' patterns and sometimes inclusions of dark red hematite or black basalt. It has a vitreous to silky luster.
Physical Characteristics
Color: Blue/White/Teal; Streak: White; Cleavage: Perfect in two directions (though not visible in tumbled specimens); Fracture: Splintery to uneven; Specific Gravity: 2.74–2.90; Fluorescence: Sometimes weak dull green under UV.
Optical Properties
Refractive Index: 1.59–1.63; Birefringence: 0.032 to 0.038; Luster: Vitreous to silky; Doubly refractive; No significant pleochroism.
Hardness & Durability
Origin Region
Barahona, Dominican Republic (Los Chupaderos mine). Exclusively found in this single Caribbean location.
Hardness & Durability
Mohs Hardness: 4.5–5.0. It is relatively soft and brittle compared to quartz, making it susceptible to scratching and impact damage.
Care & Maintenance
Clean only with warm soapy water and a soft cloth; avoid ultrasonics, steam, and acids. Store separately from harder gemstones and limit exposure to direct sunlight as colors may fade.
Rarity & Value
Very Rare (limited to a single 1-square-kilometer deposit); value is determined by color depth (deep blue is best), clarity of white patterns, and lack of green/brown spots.
Special Characteristics
Characteristic 'sea-foam' or 'wave' patterns caused by the way fibrous pectolite aggregates; can contain distinct dendrites or dark flecks of native copper.
Lore & History
Discovered in 1916 but promoted in 1974 by Miguel Méndez, who named it after his daughter (Larissa) and the sea (Mar). Commonly associated with the Throat Chakra, communication, and serenity.