Simpsonite

Simpsoniet, Simpsonit, Simpsonita, Симпсонит, シンプソン石, 鉭鋁石


Commonly known      rarer (so called collectors stones)      very rare (rarities)      relatively rare organic material


Formula: Al4(Ta,Nb)3(O,OH,F)14
Mineral class: oxides
Crystal system: trigonal
Mohs scale: 7 - 7.5
Density (g/cm3): 6.7 - 6.8
Refractive index: 1.976 - 2.045
Cleavage: -
Colors: colorless, white, yellowish, brownish
Luster: adamantine
Fluorescence: SW: blue-white, sometimes yellowish
Pleochroism: -
Largest Simpsonite: 2.4 cm?
Deposits: Australia, Brazil, Kazakhstan, Russia, Zaire, Zimbabwe
Discovery: 1938
1st Description: 1944
Name: in honor of the Australian mineralogist Edward Sydney Simpson (1875 - 1939)

Simpsonite Mineral

Origin: Alto do Giz Pegmatite / Equador / Rio Grande do Norte / Brazil

Photo by kind permission of © www.irocks.com
Simpsonite Mineral

Simpsonite Mineral

Size: 1.6 x 1.5 x 1.2 cm

Origin: Alto do Giz Pegmatite / Equador / Rio Grande do Norte / Brazil

Photo by kind permission of © www.irocks.com
Simpsonite Mineral
Simpsonite

Weight: 1.06 ct

Origin: Brazil

Photo by kind permission of © www.gemfrance.com


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