whewellite
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.
CHEMICAL CHARACTERISTICS
Ca[C2O4](H2O)
hydrated calcium oxalate
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
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
CRYSTALS PROPERTIES
short prisms up to 2 cm of lenght
crystals system
monoclinic
OTHER INFORMATIONS
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
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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