Larimar
Pectolite var. Larimar · Decorative Stone and Semi-Precious Gemstone
Crystal System
Triclinic, occurring as fibrous, radiating, or massive crystalline aggregates
Mineral Group
Silicates, specifically in the Inosilicate subgroup (pyroxenoid group)
Chemical Formula
NaCa2Si3O8(OH) with Cu substituting for Ca
Formation Process
Hydrothermal formation where hot fluids circulate through volcanic basalt cavities, depositing pectolite rich in copper during a secondary mineralization phase
About This Crystal
An opaque to translucent massive mineral specimen featuring pale to vibrant turquoise-blue and greenish-blue hues intermixed with white, cream, and grey matrix patterns, displaying a distinct mottled or cloud-like appearance reminiscent of sunlight reflecting on Caribbean water
Physical Characteristics
Color ranges from white and light blue to deep oceanic blue with greyish-brown host rock matrix; streak is white; cleavage is perfect in two directions; fracture is uneven to splintery; specific gravity is approximately 2.70 to 2.90; tenacity is brittle
Optical Properties
Biaxial (+) with refractive indices ranging between 1.594 and 1.633; birefringence is around 0.039; generally exhibits a vitreous to silky luster depending on the crystal fiber orientation; no significant pleochroism
Hardness & Durability
Origin Region
Barahona province in the Dominican Republic; formed in volcanic cavities via hydrothermal alteration
Hardness & Durability
Mohs hardness of 4.5 to 5, making it relatively soft and susceptible to scratching; moderate to low durability requiring careful handling, unsuited for rings without protective settings due to perfect cleavage
Care & Maintenance
Clean gently with warm soapy water and a soft cloth; avoid ultrasonic cleaners, harsh chemicals, steam cleaning, and prolonged exposure to direct sunlight which can cause the blue color to fade over time
Rarity & Value
Rare and localized to a single global deposit in the Dominican Republic; value depends heavily on color saturation, deep blue tones, lack of excessive matrix, and pattern definition
Special Characteristics
Distinctive ocean-like chatoyant or cloud-like patterned aesthetics caused by the fibrous radiating growth structure and trace copper impurities; completely unique visual texture found almost exclusively in Caribbean specimens
Lore & History
Discovered locally in 1916 and rediscovered in 1974, named after 'Larissa' (daughter of the discoverer Miguel Méndez) and 'mar' (Spanish for sea); often associated with the throat chakra, representing tranquility, peace, and healing energy in modern crystal lore