![greenokite from Bishoptown in Scotland](https://www.patrickvoillot.com/wp-content/uploads/2021/03/greenockite-cristal-bishoptown-ecosse168-150x150.png)
![whewellite fancy cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/whewellite-taille-fantaisie26-300x185.png)
whewellite
![whewellite crystal from Germany](https://www.patrickvoillot.com/wp-content/uploads/2021/03/whewellite-cristal-allemagne-300x200.jpg)
whewellite crystal from Germany
Detailed sheet
whewellite
It honors the name of the English mineralogist William Whewell (1794-1866). It is a component of kidney stones. The fine twinned crystals result from the reaction of the urine of horses working in the mines with the host rock.
![](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
Ca[C2O4](H2O)
hydrated calcium oxalate
![](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, brown, grey, yellow
Color of streak
white
Luster
pearly, vitreous
Hardness
2.5 to 3.0
Density
2.18 to 2.23
Cleavage
perfect
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
transparent
Refractive index
1.489 - 1.653
Double refraction
0.159
very strong biaxial positive
visible double refraction
No
Dispersion
0,035
Pleochroism
absent
Number of colors
1
Fluorescence
variable
sometimes bluish
![](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
short prisms up to 2 cm of lenght
![](https://www.patrickvoillot.com/wp-content/uploads/2021/03/cristal-whewellite.gif)
crystals system
monoclinic
![](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 (Minas Gerais), Australia (Tasmania), Russia (Dalnegorsk), Germany, the United States.
use in jewelry
only a collection stone
Venez visitez
notre site web
voillot-joaillier.fr
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