cancrinite
cancrinite crystal from Niende in Cameroun
Detailed sheet
cancrinite
It was identified in 1839 by a German mineralogist and named in honor of the Russian Finance Minister George Kankrin (1774-1845).
This stone is particular : it is a silicate but effervesces with acid because it contains carbonates.
CHEMICAL CHARACTERISTICS
Na6Ca2[Si4O11]2 (OH,F)
fluoro-calcium and sodium silicate
PHYSICAL CHARACTERISTICS
Main color
yellow
Other colors
white, blue, grey, orange, pink, green
Color of streak
white
Luster
greasy, pearly, vitreous
Hardness
5.0 to 6.0
Density
2.41 to 2.42
Cleavage
perfect
Fracture
conchoidal
pearly on the cleavage
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.495 - 1.530
Double refraction
0.012
definite negative uniaxial
visible double refraction
No
Dispersion
0,010(0.007)
Pleochroism
absent
Number of colors
1
Fluorescence
none
CRYSTALS PROPERTIES
prismatic
crystals system
hexagonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in many countries, Brazil, Africa (Malawi, Rwanda, Namibia), Burma (Mogok), China, Russia (Urals), Italy, New Zealand, the United States …
use in jewelry
it is faceted or cabochon cut for collection
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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