![baguette cut adamite from Mexico](https://www.patrickvoillot.com/wp-content/uploads/2021/03/adamite-baguette-mexique269-150x150.png)
![simpsonite from Brazil oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/simpsonite-ovale-bresil68-300x211.png)
simpsonite
![simpsonite crystal from Rio Grande do Norte in Brazil](https://www.patrickvoillot.com/wp-content/uploads/2021/03/simpsonite-rio-grande-do-norte-bresil-300x200.jpg)
simpsonite crystal from Rio Grande do Norte in Brazil
Detailed sheet
simpsonite
It was discovered in Australia and its name honors the Australian mineralogist Edward Sydney Simpson (1875-1939).
![](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
Al4(Ta,Nb)3O13(OH)
aluminum oxide and rare earth
![](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
orange
Other colors
white, brown, yellow
Color of streak
white
Luster
adamantine, resinous
Hardness
7.0 to 7.5
Density
5.90 to 6.85
Cleavage
none
Fracture
conchoidal
![](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
1.990 - 2.040
Double refraction
0.020
definite negative uniaxial
visible double refraction
No
Pleochroism
absent
Number of colors
1
Fluorescence
variable
blue, yellow
![](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
rarely well shaped
![](https://www.patrickvoillot.com/wp-content/uploads/2021/03/cristal-simpsonite.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 Brazil (Vulture Mine), in pénisule Kola in Russia, Australia.
use in jewelry
It’s a collection stone
Venez visitez
notre site web
voillot-joaillier.fr
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