bustamite
bustamite crystal from Broken-Hill in Australia
Detailed sheet
bustamite
Discovered in 1822, its name honors the Mexican General Anastasio Bustamante (1780-1853).
CHEMICAL CHARACTERISTICS
(Mn,Ca)3[Si3O9]
calcium manganese silicate
PHYSICAL CHARACTERISTICS
Main color
pink
Other colors
brown, yellow
Color of streak
white
Luster
vitreous
Hardness
5.5 to 6.0
Density
3.30 to 3.40
Cleavage
perfect
Fracture
uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.622 - 1.710
Double refraction
0.015
weak biaxial (-)
visible double refraction
Yes
Dispersion
-
Pleochroism
weak
Number of colors
2
pink, yellow
Fluorescence
none
CRYSTALS PROPERTIES
thick
crystals system
triclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Honduras (El Mochito Mine), United States (Sterling Mine, New Jersey and Crescent Mine in Washington State), China, Mongolia, Sweden, Germany, South Africa.
use in jewelry
it is cut in facets for collection
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