Larimar
Pectolite var. Larimar (Blue Pectolite) · Semi-Precious Gemstone / Collector Mineral
Crystal System
Triclinic; typically forms in massive, fibrous, or radiating aggregates.
Mineral Group
Silicates (Inosilicates)
Chemical Formula
NaCa2Si3O10(OH) with traces of Copper (Cu)
Formation Process
Hydrothermal; formed by the filling of cavities (amygdules) within basaltic lavas by mineral-rich hot fluids.
About This Crystal
A sky-blue to turquoise-blue stone often exhibiting 'turtle-back' or 'Caribbean sea' patterns. This specimen is carved into a star shape, showing translucent to opaque sections with signature white needle-like inclusions and cloud-like structures. It has a vitreous to silky luster.
Physical Characteristics
Color ranges from white to light-blue to deep 'volcanic' blue; streak is white. Cleavage is perfect in two directions. Fracture is splintery to uneven. Specific gravity is 2.7–2.9. It typically does not fluoresce, though white calcite inclusions might.
Optical Properties
Refractive index is approximately 1.59–1.63. It is biaxial positive. It exhibits weak pleochroism and possesses a characteristic chatoyant-like silky luster in fibrous areas.
Hardness & Durability
Origin Region
Barahona Province, Dominican Republic (exclusively from the Filipinas Mine in Los Chupaderos).
Hardness & Durability
Mohs hardness: 4.5 – 5.0. It is relatively soft and brittle with a fair toughness; requires careful handling in jewelry.
Care & Maintenance
Clean only with warm, soapy water and a soft cloth. Avoid ultrasonic cleaners, steam, and harsh chemicals. It is light-sensitive and can fade if exposed to prolonged direct sunlight.
Rarity & Value
Rare; found in only one square kilometer in the Dominican Republic. Value is determined by 'volcanic blue' saturation and high-contrast white patterning. Most Larimar is untreated, though dyeing can occur in low-quality imitations.
Special Characteristics
Exhibits a unique 'ocean-wave' pattern caused by the radiating fibrous growth of pectolite crystals. Copper content is responsible for the distinct blue coloration.
Lore & History
Discovered in 1916 but promoted in 1974 by Miguel Méndez, who named it after his daughter (Larissa) and the sea (Mar). Traditionally associated with the Throat Chakra, it is often called the 'Dolphin Stone' or 'Atlantis Stone' in spiritual practices, believed to promote tranquility and communication.