![yellow - green sillimanite from Tanzania](https://www.patrickvoillot.com/wp-content/uploads/2021/03/sillimanite-tanzanie67-150x150.png)
![emerald cut proustite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/proustite-taille-emeraude88-300x189.png)
proustite
![red proustite crystal from Dolores in Chile](https://www.patrickvoillot.com/wp-content/uploads/2021/03/proustite-cristal-dolores-chili-300x200.jpg)
red proustite crystal from Dolores in Chile
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image.png)
CHEMICAL CHARACTERISTICS
Ag3AsS3
silver sulfo - arsenate
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image2.png)
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
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image3.png)
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
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image4.png)
CRYSTALS PROPERTIES
massive prismatic
![](https://www.patrickvoillot.com/wp-content/uploads/2021/03/cristal-proustite.gif)
crystals system
trigonal
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image5.png)
OTHER INFORMATIONS
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image6.png)
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.
Venez visitez
notre site web
voillot-joaillier.fr
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