Sodalite | Gemopedia

Sodalite is a mineral used most often for carvings and some types of jewelry. Known for its rich, royal blue hues, sodalite is found in limited areas of the world. Frequently mottled with white veins of calcite, sodalite resembles lapis lazuli in appearance and has been mistaken for it at times. It can occur not only as blue, but also in crystals of gray, yellow, green or pink color.
Alternate
Names
Canadian Blue Stone
Colors
Dark Blue To Violet Blue With White Veining; Veining Can Be Yellow, Red, Rarely Gray, Greenish, Yellowish, White, Pink

Sodalite Classification

Common Name

Sodalite

Species

Sodalite

Variety

Colors

Dark Blue To Violet Blue With White Veining; Veining Can Be Yellow, Red, Rarely Gray, Greenish, Yellowish, White, Pink

Alternate Names

Canadian Blue Stone

Gemstone Groups

Key Separations

appearance, RI, SG and possibly fluorescence

Comments

Sodalite Optical Properties

Transparency

Opaque

Refractive Index

1.483
Tolerance:(+0.004/-).004)

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: moderate orange, green, or yellowish white
LWUV: moderate to strong orange, yellowish white, or red

CCF Reaction

Pleochroism

None

Dispersion

Comments

Sodalite Chemistry & Crystallography

Chemical Name

chloric sodium aluminum silicate

Chemical Formula

Na8Al6Si6O24Cl2

Synthesis

Crystal System

Cubic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Sodalite Characteristic Physical Properties

Hardness

5-6

Streak

White

Specific Gravity

2.15-2.4 Typical:2.25

Toughness

Poor

Inclusions

Sodalite usually has white calcite patches and veins. Stones lack pyrite inclusions unlike lapis.

Luster

Vitreous

Stability

Fracture

Uneven

Cleavage

Poor, in one direction

Comments

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