scheelite
crystals of scheelite from Xuebaoding, Pingwu, Sichan in China
scheelite crystal from Corea
solid like inclusions
Detailed sheet
scheelite
It is named after the Swedish chemist Karl W. Scheel (1742-1786) who discovered the tungstic acid. Tungsten is the current name of the chemical that was the metal component of wolframite, scheelite is still called a wolframate or tungstate …
CHEMICAL CHARACTERISTICS
Ca[WO4]
calcium tungstate
PHYSICAL CHARACTERISTICS
Main color
yellow
Other colors
brown, colourless, orange
Color of streak
white
Luster
adamantine, greasy
Hardness
4.5 to 5.0
Density
5.90 to 6.30
Cleavage
good
Fracture
uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.916 - 1.938
Double refraction
0.010
weak uniaxial positive
visible double refraction
No
Dispersion
0,038(0.025)
Pleochroism
very weak
Number of colors
2
Absorption spectrum
584
yellow scheelite spectrum system
orange scheelite spectrum system
Fluorescence
strong
light blue or pink
CRYSTALS PROPERTIES
massive in pyramids or even dipyramids
crystals system
tetragonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
Discovered in the iron mines of Bipsberg (Dalarma, Sweden), it is found in France at Framont (Vosges), in Coastabonne (Eastern Pyrenees), in Tournebise (Puy de Dome), Germany (Zinnwald), Switzerland (Kammegg), Italy (Traversella), China, Korea, United States (Arizona), Japan, Mexico, Sri Lanka.
use in jewelry
Only the transparent samples are cut for their shine, but not for jewelry, because they are very fragile, but only for collection.
Most scheelite used as gems come from China.
Daily care
and precautions
fragile and sensitive to acids
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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