Bytownite | Gemopedia

Bytownite is a rare variety of feldspar named for deposits found in Bytown, Canada (now Ottawa). Some forms of this gem distinctly resemble the gemstone andalusite, another member of the feldspar group.
Colors
Pale Yellow, Colorless, White, Gray

Bytownite Classification

Common Name

Bytownite

Species

Anorthite

Variety

Bytownite

Colors

Pale Yellow, Colorless, White, Gray

Alternate Names

Gemstone Groups

Feldspar

Key Separations

RI and optic character

Comments

Bytownite can have a similar appearance to andalusite.

Bytownite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.561-1.583

Birefringence

0.007-0.011

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire Value: 0.012

Comments

Bytownite Chemistry & Crystallography

Chemical Name

calcium sodium aluminum silicate

Chemical Formula

(Ca,Na)(Al,Si)AlSi2O8

Synthesis

Crystal System

Triclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Bytownite Characteristic Physical Properties

Hardness

6-6.5

Streak

White

Specific Gravity

2.72-2.74

Toughness

Poor

Inclusions

Bytownite might show labradorescence.

Luster

Vitreous

Stability

Fracture

Conchoidal, Uneven

Cleavage

Perfect, in one direction, Good, in one direction

Comments

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