Ussingite | Gemopedia

Named after Niels Viggo Ussing, professor of Mineralogy at the University of Copenhagen, this rare silicate mineral can be found in only a few locations worldwide including Greenland and northern Russia. It typically has a massive habit and can be light pink, lilac-blue, and in rare cases dark violet-red.
Colors
Pale Pink, Lilac-Blue, Red-Violet

Ussingite Classification

Common Name

Ussingite

Species

Ussingite

Variety

Colors

Pale Pink, Lilac-Blue, Red-Violet

Alternate Names

Gemstone Groups

Key Separations

RI and fluorescence.

Comments

It is often confused with sodalite, but it does not fluoresce.

Ussingite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.545-1.509

Birefringence

0.041

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Comments

Ussingite Chemistry & Crystallography

Chemical Name

sodium aluminum silicate hydroxide

Chemical Formula

Na4Al2Si6O17.H2O

Synthesis

Crystal System

Triclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Ussingite Characteristic Physical Properties

Hardness

6-7

Streak

Specific Gravity

2.457-2.5

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Irregular, Uneven

Cleavage

Perfect

Comments

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