Axinite | Gemopedia

Axinite is an uncommon mineral that usually occurs in long, flat, axe-shaped crystals, a trait that makes it highly desirable to collectors who enjoy adding various crystal forms to their collections. Its strong trichroism only adds to its special appeal. As it is rotated, different colors are displayed, including rich cinnamon browns, violets, blues or greens.
Colors
Brown, Purplish Brown, Brownish Yellow, Violet, Blue

Axinite Classification

Common Name

Axinite

Species

Axinite

Variety

Colors

Brown, Purplish Brown, Brownish Yellow, Violet, Blue

Alternate Names

Gemstone Groups

Key Separations

RI, optic sign, pleochroism, spectrum

Comments

Axinite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.678-1.688
Tolerance:(+0.005/-0.005)

Birefringence

0.01-0.012

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Trichroic, strong violetish purple, light yellow and red-brown

Dispersion

Comments

Axinite Chemistry & Crystallography

Chemical Name

calcium aluminum boron sorosilicate hydroxide

Chemical Formula

(Ca,Fe,Mn,Mg)3Al2BSi4O15(OH)

Synthesis

Crystal System

Triclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Axinite Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

3.26-3.36 Typical:3.29

Toughness

Varies

Inclusions

Many stones are included some with goethite fibrous.

Luster

Vitreous

Stability

Poor

Fracture

Conchoidal, Uneven

Cleavage

Good, in one direction

Comments

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