Stilbite | Gemopedia

Stilbite is named from a Greek term meaning "to glitter" due to the pearly luster of the mineral. A member of the zeolite group, stilbite is often white, peach, pinkish, yellow or brown in color. Stilbite is further classified based on its sodium and calcium content. Stilbite is rarely faceted, but its attractive crystals make it highly collectable as mineral specimens
Alternate
Names
Desmine, Stilbite-Ca
Colors
White, Colorless, Red, Light Yellow, Brown, Light Brown, Cream, Orange, Pink

Stilbite Classification

Common Name

Stilbite

Species

Stilbite

Variety

Colors

White, Colorless, Red, Light Yellow, Brown, Light Brown, Cream, Orange, Pink

Alternate Names

Desmine, Stilbite-Ca

Gemstone Groups

Key Separations

RI

Comments

Stilbite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.484-1.513

Birefringence

0.01-0.013

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire

Comments

Stilbite Chemistry & Crystallography

Chemical Name

Chemical Formula

NaCa4(Si27Al9)O72 28(H2O)

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Stilbite Characteristic Physical Properties

Hardness

3.5-4

Streak

White

Specific Gravity

2.1-2.2

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal

Cleavage

Perfect, in one direction

Comments

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