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Betafite

#WR53913
SOLD
Betafite from Silver Crater mine, Bancroft, Ontario, Canada - WR53913
Betafite from Silver Crater mine, Bancroft, Ontario, Canada - WR53913

Betafite

#WR53913
Availability
Sold
Size
3 x 3.5 x 3 cm - Miniature 
Formula
A2(Ti,Nb)2O6Z (RRUFF)
Locality
Silver Crater mine, Bancroft, Ontario, Canada

Once known simply as the mineral species, Betafite, now in a complex mineral group called the Betafite group, which belongs to the super group of Pyrochlores with a complicated nomenclature. Compositionally, Betafites are oxides of titanium and niobium with variable subtitutions of cations uranium and calcium in the A position and variable amounts of anions O, OH, H2O, or F in the Z position.

This is one of the best Betafites I have ever seen. There are several crystals in this cluster with the biggest at the base which is about 3cm across. The crystal perched on top is 1cm across.

Betafite

Formula
(Ca,U)2(Ti,Nb,Ta)2O6(OH) 
Crystal System
Isometric 
Crystal Habit
Encrustations, Massive - Granular 
Cleavage
None, None, None 
Luster
Vitreous - Greasy 
Color
brown, black, brownish green, yellow, greenish black 
Streak
yellowish white 
Class
Isometric - Hexoctahedral 
Fracture
Conchoidal 
Hardness
5-5.5 

Data courtesy of Webmineral.

Collection
Willard L. Roberts Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Betafite
On Dakota Matrix
Other Available Betafite
WebMineral
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Mindat
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