Diaspore | Gemopedia

Diaspore is beautiful and exotic in a soft, subtle manner. It is also one of the lesser known of the color-change gemstones. Some of the finest examples of gem quality diaspore are found in Turkey's Anatolian Mountains, but it can be found in numerous places around the globe. A rising star in fine jewelry, it's easy to fall in love with its sparklingly brilliant, tranquil earthy colors.
Alternate
Names
Zultanite(R), Csarite
Colors
White, Pale Gray, Colorless, Greenish Gray, Brown, Pale Yellow, Pink, Lilac

Diaspore Classification

Common Name

Diaspore

Species

Diaspore

Variety

Colors

White, Pale Gray, Colorless, Greenish Gray, Brown, Pale Yellow, Pink, Lilac

Alternate Names

Zultanite(R), Csarite

Gemstone Groups

Diaspore

Key Separations

RI and birefringence

Comments

Strong color change variety sold under the name Zultanite(R)

Diaspore Optical Properties

Transparency

Transparent

Refractive Index

1.702-1.75

Birefringence

0.048

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

Dichroic, strong reddish violet to reddish brown or green to grayish green

Dispersion

Strength: weak fire

Comments

Diaspore Chemistry & Crystallography

Chemical Name

aluminum oxide hydroxide

Chemical Formula

AlO(OH)

Synthesis

Crystal System

Orthorhombic

Classification

Oxide

Nature

Natural

Crystallinity

Crystalline

Comments

Diaspore Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

3.3-3.39 Range:0.12/-0.18 Typical:3.38

Toughness

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal

Cleavage

Perfect, in one direction, Good, in one direction

Comments

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