powellite
yellow powellite crystal from Nasik in India
liquid healing feathers like inclusions
Detailed sheet
powellite
Discovered in 1891, its name honors the geologist and U.S. explorer John Wesley Powell (1834-1902).
CHEMICAL CHARACTERISTICS
Ca[MoO4]
calcium molybdate
PHYSICAL CHARACTERISTICS
Main color
yellow
Other colors
blue, brown, colourless, green
Color of streak
white, grey
Luster
resinous
Hardness
3.5 to 4.0
Density
4.20 to 4.30
Cleavage
indistinct
Fracture
conchoidal, uneven
easy cleavage along a single axis only
OPTICAL PROPERTIES
Transparency
translucent
Refractive index
1.967 - 1.985
Double refraction
0.011
weak uniaxial positive
visible double refraction
No
Dispersion
0,058
Pleochroism
weak
Number of colors
2
blue, green
Fluorescence
moderate
yellow
CRYSTALS PROPERTIES
massive dipyramidal
crystals system
tetragonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in France at Prats de Mollo around Ceret in the Pyrenees, in Nicaragua, Chile, Namibia, Somalia, in Queensland, Australia, India (Mumbai and Nasik regions), Mongolia, Western Siberia (Russia), in southern Germany, Scotland, Wales, England, Alaska.
use in jewelry
collection stone, practically always translucent and not so colored
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