Hiddenite | Gemopedia

Hiddenite is the green chromium-rich variety of spodumene, which is rarer than its pink sibling, kunzite. Hiddenite is named for American gemologist William Hidden, who first discovered this transparent green variety in North Carolina in the area that now also bears its name, Hiddenite.
Colors
Medium Green To Emerald Green

Hiddenite Classification

Common Name

Hiddenite

Species

Spodumene

Variety

Hiddenite

Colors

Medium Green To Emerald Green

Alternate Names

Gemstone Groups

Key Separations

RI, birefringence, optic character and spectra. Biaxial common point is 0.006 from high RI.

Comments

Some gemololgists would argue that the stones must come from Hiddenite, N.C. and colored by chromium to be called Hiddenite.

Hiddenite Optical Properties

Transparency

Transparent

Refractive Index

1.662-1.676

Birefringence

0.014-0.016

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: inert to weak orangy red or pink
LWUV: inert to weak orangy red or pink

CCF Reaction

Pleochroism

Trichroic, moderate to strong, yellowish green, green, blue-green

Dispersion

Strength: moderate fire Value: 0.017

Comments

Hiddenite Chemistry & Crystallography

Chemical Name

lithium aluminum silicate

Chemical Formula

LiAlSi2O6

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Hiddenite Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

3.15-3.21 Typical:3.18

Toughness

Poor

Inclusions

Hiddenite is a type I clarity stone. Stones might contain 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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