Willemite | Gemopedia

Willemite was discovered in 1830 and named after William I, King of the Netherlands. This stone has remarkable luminescent properties. Some specimens glow under an ultraviolet source and continue to glow after the UV light has been removed, a phenomenon called phosphorescence. Specimens that are faceted make beautiful gemstones in blue, yellow, green and brown colors.
Colors
Colorless, Yellow, Greenish-Yellow, Yellow-Green, Orange, Brown, Red, Blue

Willemite Classification

Common Name

Willemite

Species

Willemite

Variety

Colors

Colorless, Yellow, Greenish-Yellow, Yellow-Green, Orange, Brown, Red, Blue

Alternate Names

Gemstone Groups

Key Separations

RI

Comments

Willemite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.69-1.723

Birefringence

0.028-0.033

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Strong green
LWUV: Weak to strong greenish yellow to green

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire

Comments

Willemite Chemistry & Crystallography

Chemical Name

zinc silicate

Chemical Formula

Zn2SiO4

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Willemite Characteristic Physical Properties

Hardness

5.5

Streak

White

Specific Gravity

3.89-4.18

Toughness

Poor

Inclusions

Luster

Resinous

Stability

Fracture

Conchoidal, Uneven

Cleavage

Poor, in two directions

Comments

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