Star Diopside | Gemopedia

Star diopside exhibits the optical phenomenon called asterism, a star-like pattern created on the surface of a gemstone when light encounters parallel fibrous, or needle-like, inclusions within its crystal structure. Light that strikes the inclusions within the gem reflects off of the inclusions, creating a narrow band of light. When two or more intersecting bands appear, a star pattern is formed. Depending on the crystal, the star may have four, six, or even twelve rays. When only one band forms, it is classified as a "cat's eye."
Colors
Dark Green To Black

Star Diopside Classification

Common Name

Star Diopside

Species

Diopside

Variety

Star Diopside

Colors

Dark Green To Black

Alternate Names

Gemstone Groups

Key Separations

4 rayed star, RI, spectrum and might show birefringence blink

Comments

Six rayed stars are possible but rare.

Star Diopside Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

1.675-1.701
Tolerance:(+0.029/-1.701)

Birefringence

0.024-0.03

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: moderate fire Value: 0.02

Comments

Star Diopside Chemistry & Crystallography

Chemical Name

calcium magnesium silicate

Chemical Formula

CaMgSi2O6

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Star Diopside Characteristic Physical Properties

Hardness

5.5-6

Streak

White

Specific Gravity

3.22-3.4 Typical:3.29

Toughness

Poor

Inclusions

Black needle-like magnetite inclusions that might be magnetic, metallic like inclusions and liquid inclusions.

Luster

Vitreous

Stability

Fair

Fracture

Conchoidal, Uneven

Cleavage

Good, in two directions

Comments

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