Kunzite | Gemopedia

Kunzite is the pretty pink, most popular, and commercially important variety of the spodumene family, cousin to hiddenite (green spodumene) and triphane (yellow spodumene). Due to its strong pleochroism, kunzite has to be oriented particularly and cut carefully in order to achieve the deepest tone and saturation, as the stone's best color is seen when looking down the length of the crystal. Stones of 10 carats or larger display kunzite's pastel hues best, though it can be found in quite large crystals over 1,000 carats.
Colors
Pink To Violet Pink

Kunzite Classification

Common Name

Kunzite

Species

Spodumene

Variety

Kunzite

Colors

Pink To Violet Pink

Alternate Names

Gemstone Groups

Key Separations

refractive index, birefringence and fluorescence. Biaxial common point is 0.006 from high RI.

Comments

Color may fade in some kunzite upon exposure to sunlight. Stones often have deep pavilions to improve color.

Kunzite Optical Properties

Transparency

Transparent

Refractive Index

1.66-1.676

Birefringence

0.014-0.016

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Weak to moderate yellowish pink to orange
LWUV: Strong yellowish pink to orange

CCF Reaction

Pleochroism

Trichroic, moderate to strong pink, purplish pink, and colorless

Dispersion

Strength: moderate fire Value: 0.017

Comments

Kunzite Chemistry & Crystallography

Chemical Name

lithium aluminum silicate

Chemical Formula

LiAlSi2O6

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Kunzite Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

3.15-3.21 Range:+/-0.03 Typical:3.18

Toughness

Poor

Inclusions

Kunzite is a type I clarity stone. Kunzite sometimes has growth and etch tubes, healing cracks, liquid and multi-phase inclusions.

Luster

Vitreous

Stability

Fracture

Uneven, Splintery

Cleavage

Perfect, in two directions

Comments

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