Amazonite | Gemopedia

Blue-green specimens of microline are called amazon stone or amazonite, named for its supposed discovery location near the Amazon River. Amazonite that is used in jewelry is generally cut into cabochons. Gem-quality amazonite is found in the Ilmen and Ural Mountains of Russia, the Pikes Peak district of Colorado and in Minas Gerais, Brazil.
Alternate
Names
Amazon Stone
Colors
Light Green To Greenish Blue

Amazonite Classification

Common Name

Amazonite

Species

Microcline

Variety

Amazonite

Colors

Light Green To Greenish Blue

Alternate Names

Amazon Stone

Gemstone Groups

Feldspar

Key Separations

appearance, RI, magnification, SG, possible fluorescence

Comments

Misnomers: Colorado jade, Pike's Peak jade

Amazonite Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

1.522-1.53
Tolerance:(+0.004/-0.004)

Birefringence

0.008

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: Inert
LWUV: Inert to weak yellowish green

CCF Reaction

Pleochroism

None

Dispersion

Strength: none

Comments

Amazonite Chemistry & Crystallography

Chemical Name

potassium aluminum silicate

Chemical Formula

KAlSi3O8

Synthesis

Crystal System

Triclinic

Classification

Silicate

Nature

Natural

Crystallinity

Aggregate

Comments

Amazonite Characteristic Physical Properties

Hardness

6-6.5

Streak

White

Specific Gravity

2.54-2.58 Typical:2.56

Toughness

Poor

Inclusions

Amazonite has mottled coloring with grid like white streaks or patterns caused by cleavage.

Luster

Vitreous

Stability

Fracture

Uneven, Splintery

Cleavage

Perfect, in two directions

Comments

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