boracite
light blueboracite crystal from Sehnde in Germany
Detailed sheet
boracite
It takes its name from its boron content, it was discovered in Germany in Lower Saxony in 1789.
CHEMICAL CHARACTERISTICS
Mg3[B7O13]Cl
magnesium borate mineral
PHYSICAL CHARACTERISTICS
Main color
green
Other colors
white, blue, grey, colourless, yellow
greenish
Color of streak
white
Luster
adamantine, vitreous
Hardness
7.0 to 7.5
Density
2.95 to 0.00
Cleavage
none
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.657 - 1.675
Double refraction
0.010
weak, biaxial (+)
visible double refraction
No
Dispersion
0,024(0.012)
Pleochroism
absent
Number of colors
1
Fluorescence
none
very rarely fluorescent
CRYSTALS PROPERTIES
many almost cubic facets
crystals system
orthorhombic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Germany, Bolivia, Colombia, Australia, United States (Louisiana), in Kazakhstan.
use in jewelry
it’s a collection stone only
Daily care
and precautions
It is soluble in water.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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