Dioptase | Gemopedia

Dioptase is a bright emerald-green or blue-green gemstone noted for the visibility of internal cleavage planes. The transparent to translucent dioptase gemstone is uncommon and generally found in desert regions. Rivaling the beauty of emerald, dioptase is typically sold as specimens and gemstones are rarely seen, especially in sizes over 1 carat.
Colors
Intense Bluish Green

Dioptase Classification

Common Name

Dioptase

Species

Dioptase

Variety

Colors

Intense Bluish Green

Alternate Names

Gemstone Groups

Key Separations

color, RI, birefringence, cleavage and optic charater

Comments

Dioptase Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.644-1.709
Tolerance:(+0.012/-0.012)

Birefringence

0.051-0.053

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: inert
LWUV: inert

CCF Reaction

Pleochroism

Dichroic, unobservable or weak, varying shades of body color

Dispersion

Strength: moderate fire Value: 0.036

Comments

Dioptase Chemistry & Crystallography

Chemical Name

Chemical Formula

CuSiO2(OH)2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Dioptase Characteristic Physical Properties

Hardness

5

Streak

Greenish

Specific Gravity

3.28-3.35 Typical:3.3

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal, Uneven

Cleavage

Perfect, in one direction

Comments

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