Larimar
Pectolite var. Larimar · Semi-Precious Gemstone / Rare Mineral Specimen
Crystal System
Triclinic; typically found in massive, globular, or acicular fibro-radiated crystal aggregates.
Mineral Group
Silicates (Inosilicates) - Pectolite group
Chemical Formula
NaCa2Si3O8(OH) with trace copper (Cu) replacing calcium
Formation Process
Hydrothermal; formed in cavities within basaltic lavas where hot, mineral-rich fluids precipitated silicate material.
About This Crystal
A sky-blue to greenish-blue stone with a distinct 'turtle-back' or cellular pattern consisting of white circular patches and webbing. It is translucent to opaque with a vitreous to silky luster when polished.
Physical Characteristics
Color: Sky blue, turquoise, or white; Streak: White; Cleavage: Perfect in two directions (though not visible in tumbled form); Fracture: Uneven; Specific Gravity: 2.70 - 2.90; Fluorescence: None to weak.
Optical Properties
Refractive Index: 1.59 - 1.63; Birefringence: 0.038; non-pleochroic; typically exhibits a play of white light caused by the dense fiber structure.
Hardness & Durability
Origin Region
Exclusively found in the Filipinas Mine in Los Checheses, Sierra de Bahoruco, Dominican Republic.
Hardness & Durability
Mohs Hardness: 4.5 - 5.0. It is relatively soft and brittle; prone to scratching and requires protective settings in jewelry.
Care & Maintenance
Avoid ultrasonic cleaners and steam. Clean with warm soapy water only. Store away from sunlight as prolonged exposure can cause the blue color to fade. Avoid contact with acids.
Rarity & Value
Rare to Very Rare due to its single-source location. Value is determined by the depth of the blue color and the distinctness of the white patterns. Deep 'Volcano Blue' is most prized.
Special Characteristics
Features a unique chatoyant-like quality in high-quality specimens due to its fibrous structure; often contains inclusions of red-brown hematite or native copper.
Lore & History
Rediscovered in 1974 by Miguel Méndez, who named it after his daughter Larissa and the Spanish word for sea (mar). Historically linked to legends of the lost continent of Atlantis; used in crystal healing to promote tranquility and clear communication.