

simpsonite

simpsonite crystal from Rio Grande do Norte in Brazil
Detailed sheet
simpsonite
It was discovered in Australia and its name honors the Australian mineralogist Edward Sydney Simpson (1875-1939).


CHEMICAL CHARACTERISTICS
Al4(Ta,Nb)3O13(OH)
aluminum oxide and rare earth


PHYSICAL CHARACTERISTICS
Main color
orange
Other colors
white, brown, yellow
Color of streak
white
Luster
adamantine, resinous
Hardness
7.0 to 7.5
Density
5.90 to 6.85
Cleavage
none
Fracture
conchoidal


OPTICAL PROPERTIES
Transparency
translucent
Refractive index
1.990 - 2.040
Double refraction
0.020
definite negative uniaxial
visible double refraction
No
Pleochroism
absent
Number of colors
1
Fluorescence
variable
blue, yellow


CRYSTALS PROPERTIES
rarely well shaped

crystals system
trigonal


OTHER INFORMATIONS


APPROACHING GEMS
Exploited
sites
It is found in Brazil (Vulture Mine), in pénisule Kola in Russia, Australia.
use in jewelry
It’s a collection stone
Venez visitez
notre site web
voillot-joaillier.fr
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