Azurite | Gemopedia

Azurite is a copper carbonate mineral found in the oxidation zones of copper deposits and is considered a secondary ore of copper. Color ranges from light to dark blue, with medium to dark blue being more common. The intensity of its hues is what makes azurite a popular collector's stone. Azurite is commonly found in conjunction with malachite, a green copper carbonate mineral into which it slowly morphs. A mix of the two minerals is known as azurmalachite. Azurite is soft (3.5 on Mohs' scale) and opaque. When used in jewelry, it is usually seen in the form of cabochons or beads.
Alternate
Names
Chessy Copper, Chessylite, Azure Stone
Colors
Dark Blue To Violet Blue

Azurite Classification

Common Name

Azurite

Species

Azurite

Variety

Colors

Dark Blue To Violet Blue

Alternate Names

Chessy Copper, Chessylite, Azure Stone

Gemstone Groups

Key Separations

RI, birefringence blink, appearance

Comments

Misnomers : blue malachite, copper lapis

Azurite Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

Over The Limit 1.73-1.836
Tolerance:(+0.010/-0.010)

Birefringence

0.106

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Dichroic, moderate to strong dark blue and lighter blue

Dispersion

Comments

Azurite Chemistry & Crystallography

Chemical Name

copper carbonate hydroxide

Chemical Formula

Cu3(CO3)2(OH)2

Synthesis

Crystal System

Monoclinic

Classification

Carbonate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Azurite Characteristic Physical Properties

Hardness

3.5-4

Streak

Light Blue

Specific Gravity

3.7-3.89 Typical:3.8

Toughness

Poor

Inclusions

Azurite sometimes displays botryoidial structure often with matrix and malachite inclusions.

Luster

Vitreous

Stability

Poor

Fracture

Conchoidal, Uneven

Cleavage

Perfect, in one direction

Comments

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