proustite
red proustite crystal from Dolores in Chile
CHEMICAL CHARACTERISTICS
Ag3AsS3
silver sulfo - arsenate
PHYSICAL CHARACTERISTICS
Main color
red
it becomes black after prolonged exposure to light
Color of streak
red
Luster
resinous
Hardness
2.5 to 0.0
Density
5.50 to 5.65
Cleavage
good
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
translucent
Refractive index
2.880 - 3.085
Double refraction
0.203
very strong uniaxial ( - )
visible double refraction
Yes
Dispersion
-
Pleochroism
strong
Number of colors
2
bright red, dark red
Fluorescence
none
CRYSTALS PROPERTIES
massive prismatic
crystals system
trigonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Peru, Bolivia, China, Russia, Eastern Siberia (Dalnegorsk), Germany, England, Switzerland, Canada, United States, Mexico.
use in jewelry
Rare collection stone of deep red and of a remarkable brilliancy.
Daily care
and precautions
It must be absolutely protected from light to avoid blackening. It is fragile and easily damaged.
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