Lazurite | Gemopedia

Lazurite is a richly colored blue mineral primarily seen in cabochon gems or carvings. Lazurite is a major component of lapis lazuli, giving the stone its brilliant blue color. Lazurite crystals are rare, as the gem is most commonly found in massive form and rarely as well-formed crystals.
Colors
Deep Blue, Violet-Blue, Greenish Blue, Green

Lazurite Classification

Common Name

Lazurite

Species

Lazurite

Variety

Colors

Deep Blue, Violet-Blue, Greenish Blue, Green

Alternate Names

Gemstone Groups

Sodalite

Key Separations

Comments

Lazurite is what give lapis lazuli its blue color. Lazurite is a sufide rich variety of hayne.

Lazurite Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.502-1.522

Birefringence

Optic Character

Optic Sign

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Comments

Lazurite Chemistry & Crystallography

Chemical Name

Chemical Formula

Na6Ca2(Al6Si6O24)(SO4,S3,S2,ClOH)2

Synthesis

Crystal System

Cubic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Lazurite Characteristic Physical Properties

Hardness

5.5

Streak

Bright Blue Sometimes White

Specific Gravity

2.3-2.4

Toughness

Poor

Inclusions

Lazurite commonly has white calcite and brassy pyrite inclusions.

Luster

Vitreous

Stability

Poor

Fracture

Uneven

Cleavage

Poor

Comments

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