Hambergite | Gemopedia

Hambergite is an often colorless gemstone named in honor of Swedish mineralogist A. Hamberg. While it is durable enough to wear in jewelry, hambergite is most commonly seen in specimen form. Rarely is a specimen flawless, and it can be easily confused with colorless quartz since they are similar in appearance. A unique characteristic of hambergite is its prefect cleavage that makes faceting into a gemstone very difficult for cutters.
Colors
Colorless, Gray To White, Yellow To White

Hambergite Classification

Common Name

Hambergite

Species

Hambergite

Variety

Colors

Colorless, Gray To White, Yellow To White

Alternate Names

Gemstone Groups

Key Separations

RI, birefringence and SG

Comments

Hambergite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.553-1.628

Birefringence

0.071-0.074

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: inert to weak yellowish white
LWUV: Inert to weak orange

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire Value: 0.015

Comments

Hambergite Chemistry & Crystallography

Chemical Name

Chemical Formula

Be2BO3(OH)

Synthesis

Crystal System

Orthorhombic

Classification

Borate

Nature

Natural

Crystallinity

Crystalline

Comments

Hambergite Characteristic Physical Properties

Hardness

7.5

Streak

White

Specific Gravity

2.33-2.37 Typical:2.35

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal

Cleavage

Perfect, in one direction, Good, in one direction

Comments

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