Detailed sheet

bytownite

It is the town of Bytown near Ottawa that gave it its name. It is part of the plagioclase family,close to the anorthite pole.



CHEMICAL CHARACTERISTICS

(Ca,Na)[(Si,Al)4O8]

sodium and calcium alumino-silicate



PHYSICAL CHARACTERISTICS

Main color

green

Other colors

white, grey, colourless, yellow

Color of streak

white

Luster

vitreous

Hardness

6.0 to 6.5

Density

2.70 to 0.00

Cleavage

perfect

Fracture

uneven

very small plane parts are observed on the fracture



OPTICAL PROPERTIES

Transparency

transparent

Refractive index

1.560 - 1.580

Double refraction

0.010

weak biaxial (-)

visible double refraction

No

Dispersion

0,012

Pleochroism

absent

Number of colors

1

Fluorescence

none



CRYSTALS PROPERTIES

crystals system

monoclinic



OTHER INFORMATIONS

Exploited
sites

It is found in Madagascar, Mexico, El Salvador, South Korea, USA and Australia.

use in jewelry

faceted for collection

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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