Larimar (pectolite) | Gemopedia

Larimar is a rare blue to green variety of pectolite, a mineral prized mainly by specimen collectors. While pectolite may be found in several locations, including Canada, England and the U.S., larimar is found only in the Dominican Republic. This unique blue gem formed as a result of volcanic activity millions of years ago that created the Caribbean island of Hispaola. The most prized larimar exhibits sky blue color with a white pattern throughout, quite similar to the look of sunlight dancing on the floor of a pool. This gem was named by its discoverer for both his daughter, Larissa, and el mar, the sea.
Colors
Blue Mottled With White

Larimar (pectolite) Classification

Common Name

Larimar (pectolite)

Species

Pectolite

Variety

Larimar

Colors

Blue Mottled With White

Alternate Names

Gemstone Groups

Key Separations

Appearance, RI and SG. Sometimes magnification and fluorescence might be helpful.

Comments

Larimar (pectolite) Optical Properties

Transparency

Semitransparent - Opaque

Refractive Index

1.599-1.628
Tolerance:(+0.017/-0.004)

Birefringence

0.029-0.038

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to strong greenish yellow or orange
LWUV: Inert to moderate greenish yellow or orange

CCF Reaction

Pleochroism

None

Dispersion

Comments

Larimar (pectolite) Chemistry & Crystallography

Chemical Name

Chemical Formula

NaCa2Si3O8(OH)

Synthesis

Crystal System

Triclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Larimar (pectolite) Characteristic Physical Properties

Hardness

4.5-5

Streak

White

Specific Gravity

2.74-2.9 Typical:2.81

Toughness

Varies

Inclusions

Under magnification larimar has tiny spheres that have blue center and white outer edge.

Luster

Vitreous

Stability

Fracture

Uneven, Splintery

Cleavage

Perfect, in two directions

Comments

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