friedelite
translucent slice of friedelite from South Africa
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
APPROACHING GEMS
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
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