Bustamite | Gemopedia

Named in honor of its discoverer, Anastio Bustamente, bustamite is a member of the wollastonite group. Often similar to rhodonite in appearance, it is usually found as a massive transparent pink material that may be cut into cabochons or carved into figurines.
Colors
Pink, Reddish-Violet, Yellow, Brownish Red

Bustamite Classification

Common Name

Bustamite

Species

Bustamite

Variety

Colors

Pink, Reddish-Violet, Yellow, Brownish Red

Alternate Names

Gemstone Groups

Wollastonite

Key Separations

RI, birefringence, optic character

Comments

Pink color fades after exposed to sunlight.

Bustamite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.662-1.707

Birefringence

0.014-0.015

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Moderate violet red
LWUV: Strong red

CCF Reaction

Pleochroism

Dichroic, unobservable to weak pinkish red and orange

Dispersion

Strength: weak fire

Comments

Bustamite Chemistry & Crystallography

Chemical Name

manganese calcium silicate

Chemical Formula

(Ca,Mn2+)3[Si3O9]

Synthesis

Crystal System

Triclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Bustamite Characteristic Physical Properties

Hardness

5.5-6

Streak

White

Specific Gravity

3.32-3.43

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal

Cleavage

Perfect, in one direction, Good, in two directions, Poor, in one direction

Comments

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