![beryllonite fancy cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/beryllonite-taille-fantaisie235-150x150.png)
![thaumasite emerald cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/thaumasite-taille-emeraude47-300x192.png)
thaumasite
![thaumasite crystals of South Africa](https://www.patrickvoillot.com/wp-content/uploads/2021/03/thaumasite-cristaux-afrique-du-sud-300x200.jpg)
thaumasite crystals of South Africa
Detailed sheet
thaumasite
Discovered in Sweden in 1878, its name comes from the Greek “thaumasion” which means surprising, in relation to its amazing chemical composition.
![](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
Ca3Si(CO3)(SO4)(OH)6 - 12(H2O)
complex sulfate
![](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
colourless
Other colors
white, grey, yellow
Color of streak
white
Luster
silky, vitreous
Hardness
3.5 to 0.0
Density
1.90 to 0.00
Cleavage
indistinct
Fracture
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, transparent
Refractive index
1.462 - 1.505
Double refraction
0.035
definite uniaxial negative
visible double refraction
Yes
Dispersion
-
Pleochroism
absent
Number of colors
1
Fluorescence
weak
white
![](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
often acicular or radial, and hexagonal prisms
![](https://www.patrickvoillot.com/wp-content/uploads/2021/03/thaumasite-cristal.gif)
crystals system
hexagonal
![](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 South Africa, in Namibia (Tsumeb), Australia (Tasmania), Japan, the USA, Europe.
use in jewelry
it is cut in facets, it’s a collection stone
Venez visitez
notre site web
voillot-joaillier.fr
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