willemite
rough transparent willemite
Detailed sheet
willemite
Discovered in 1830 and named in honor of King Willem I of the Netherlands.
CHEMICAL CHARACTERISTICS
Zn2[SiO4]
zinc silicate
PHYSICAL CHARACTERISTICS
Main color
orange
Other colors
white, blue, brown, grey, yellow, black, pink, red, green
the most sought varieties are yellow and orange
Color of streak
white
Luster
resinous, vitreous
Hardness
5.5 to 0.0
Density
3.90 to 4.20
Cleavage
good
Fracture
conchoidal, splintery
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.690 - 1.730
Double refraction
0.028
definite uniaxial positive
visible double refraction
Yes
Dispersion
0,027
Pleochroism
absent
Number of colors
1
Absorption spectrum
421
Fluorescence
moderate
green and varying colors. phosphorescent
CRYSTALS PROPERTIES
pseudo-hexagonal
crystals system
trigonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
found in New Jersey in the U.S.
use in jewelry
it’s a collection stone, very difficult to cut
Other
Gems
Envie d’acquérir
une pierre certifiée ?
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