liquid like inclusions, healing fissures
dumortierite
blue dumortierite crystals from Sahatany in Madagascar
detail of blue dumortierite crystals from Sahatany in Madagascar
Dumortiérite from Myanmar
liquid like inclusions, healing fissures
dumortierite
Detailed sheet
dumortierite
Its name honors Eugene Dumortier, a paleontologist from Lyon (France )(1802-1873).
It occurs most commonly as quartz inclusions, it is then called “blue aventurine”.
CHEMICAL CHARACTERISTICS
Al7(BO3)[SiO4]3O3
aluminum boro - silicate
PHYSICAL CHARACTERISTICS
Main color
blue
Other colors
brown, red, purple
Color of streak
white
Luster
greasy, vitreous
Hardness
7.0 to 8.5
Density
3.25 to 3.40
Cleavage
good
Fracture
uneven
OPTICAL PROPERTIES
Transparency
opaque, translucent, transparent
Refractive index
1.680 - 1.720
Double refraction
0.015
can only be seen on transparent rocks, negative biaxial
visible double refraction
No
Dispersion
-
Pleochroism
strong
Number of colors
3
black, brown - red, brown
Fluorescence
weak
blue to violet
CRYSTALS PROPERTIES
rare, prismatic. Often in aggregates.
crystals system
orthorhombic
OTHER INFORMATIONS
Astrological sign
Pisces, Sagittarius, Scorpio
APPROACHING GEMS
Exploited
sites
It is found in France, at Beaunan in the Monts du Lyonnais, Brazil, Canada, United States (California, Nevada), India, Madagascar, Mozambique, Namibia, Sri Lanka.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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