Detailed sheet

friedelite

Its name honors the French chemist and mineralogist Charles Friedel (1832-1899).



CHEMICAL CHARACTERISTICS

Mn8[Si6O15](OH,Cl)10

manganese chlorine silicate



PHYSICAL CHARACTERISTICS

Main color

brown

Other colors

brown, yellow, pink, red

often brown - red or pink

Color of streak

pink

Luster

vitreous

Hardness

4.0 to 5.0

Density

3.05 to 3.20

Cleavage

indistinct

Fracture

uneven



OPTICAL PROPERTIES

Transparency

opaque, translucent

Refractive index

1.625 - 1.664

Double refraction

0.030

definite, biaxial

visible double refraction

Yes

Pleochroism

absent

Number of colors

1

Absorption spectrum

556

Fluorescence

none

pale reddish

Inclusions

of liquid type, gas, oil, and metal flakes. "three phases" inclusions



CRYSTALS PROPERTIES

tabular

crystals system

monoclinic



OTHER INFORMATIONS

Exploited
sites

It is found in the U.S. (in several mines in Colorado, at the Sterling Mine in New Jersey), in France (Eastern Pyrenees, mine Prats de Mollo, Ceret), South Africa, Sweden and Broken Hill in Australia.

use in jewelry

rarely transparent, often cabochon cut

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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