Goshenite | Gemopedia

While most members of the beryl family such as emerald or aquamarine are famous for their colors, goshenite is the highly collectible colorless variety that displays a diamond-like fiery brilliance. Interestingly, pure beryl is colorless, with traces of different metallic elements being responsible for this gem family's great color range. Always limited in availability, goshenite is named for the locale where it was first discovered--Goshen, Massachusetts.
Alternate
Names
Colorless Beryl
Colors
colorless

Goshenite Classification

Common Name

Goshenite

Species

Beryl

Variety

Goshenite

Colors

colorless

Alternate Names

Colorless Beryl

Gemstone Groups

Key Separations

refractive index, birefringence and optic character

Comments

Goshenite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.577-1.583
Tolerance:(+0.017/-0.017)

Birefringence

0.005-0.009

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire Value: 0.014

Comments

Goshenite Chemistry & Crystallography

Chemical Name

beryllium aluminum silicate

Chemical Formula

Be3Al2(SiO3)6

Synthesis

Crystal System

Hexagonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Goshenite Characteristic Physical Properties

Hardness

7.5

Streak

White

Specific Gravity

2.67-2.9 Range:0.18/-0.05 Typical:2.72

Toughness

Good

Inclusions

Goshenite is a type I clarity stone but sometimes contains tubular, liquid or two-phase inclusions.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

Poor, in one direction

Comments

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