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Bronzite

Enstatite

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: March 2022
Bronzite Polished Bronzite Rough Bronzite Jewelry
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Table of Contents
  • General Information
  • Bronzite Colors
  • Countries of Origin
  • History
  • More About Bronzite

Bronzite is an iron-bearing variety of enstatite distinguished by its green-brown color and bronze-like sub-metallic luster with fibrous inclusions. Enstatite is a silicate and a member of the pyroxene group. Appreciated for its sheen, bronzite is sometimes polished to make small ornamental objects.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Bronzite
Species
Enstatite
Transparency
Transparent - Opaque
Refractive Index
1.665-1.703
Tolerance:(+0.010/-0.010)
Birefringence
0.008-0.015
Optic Character
Biaxial
Optic Sign
Positive
Polariscope Reaction
Aggregate (AGG), Doubly Refractive (DR)
Fluorescence
SWUV: inert
LWUV: inert
Pleochroism
Trichroic, strong green, yellow, and reddish brown
Hardness
5-6
Streak
White Or Brownish
Specific Gravity
3.300-3.430 Typical:3.350
Toughness
Poor
Inclusions
Bronzite has fibrous inclusions and might show schiller effect.
Luster
Vitreous, Metallic
Fracture
Uneven
Cleavage
Good, in one direction
Chemical Name
magnesium iron silicate
Chemical Formula
(Mg,Fe)2Si2O6
Crystal System
Orthorhombic
Chemistry Classification
Silicate

Bronzite Colors

  • Brown Bronzite
    Brown

Countries of Origin

Unknown; Brazil

History

This stone has earthy appeal and is most often found in cabochons or beads. It's a variety of enstatite and is named for the bronze-like appearance created by the presence of iron. It often has a metallic-like shimmer and is found in opaque, translucent, and transparent greenish-brown shades. Inclusions add distinction to individual stones. With a hardness of 5.5 on the Mohs scale, it's very wearable in a multitude of ways.

More About Bronzite

Bronzite may inspire you to act with honor.

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