Beryllonite | Gemopedia

Named for its beryllium content, beryllonite is a colorless to white or pale yellowish crystal. It is usually transparent with a vitreous to pearly luster, and is often heavily included. This rare gem is found in only a few places around the world, notably in Maine, USA.
Colors
Colorless, White, Pale Yellow

Beryllonite Classification

Common Name

Beryllonite

Species

Beryllonite

Variety

Colors

Colorless, White, Pale Yellow

Alternate Names

Gemstone Groups

Key Separations

RI, optic character

Comments

Beryllonite Optical Properties

Transparency

Transparent

Refractive Index

1.552-1.561

Birefringence

0.009-0.01

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: weak fire Value: 0.01

Comments

Beryllonite Chemistry & Crystallography

Chemical Name

sodium beryllium phosphate

Chemical Formula

NaBePO4

Synthesis

Crystal System

Monoclinic

Classification

Phosphate

Nature

Natural

Crystallinity

Crystalline

Comments

Beryllonite Characteristic Physical Properties

Hardness

5.5-6

Streak

White

Specific Gravity

2.79-2.87

Toughness

Poor

Inclusions

Beryllonite is typically included and will have fluid inclusions.

Luster

Vitreous

Stability

Fracture

Conchoidal

Cleavage

Perfect

Comments

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