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Ixiolite

#55159
SOLD
Ixiolite from Helen Beryl mine, Custer Co., South Dakota, United States - 55159
Ixiolite from Helen Beryl mine, Custer Co., South Dakota, United States - 55159

Ixiolite

#55159
Availability
Sold
Size
6 x 5 x 2.5 cm - Sm Cabinet 
Formula
(Ta,Nb,Sn,Fe,Mn)O2 (RRUFF)
Locality
Helen Beryl mine, Custer Co., South Dakota, United States
Tagged
tin

(EDS) It looks like Columbite but contains enough manganese, iron, and tin to be called Ixiolite, which is rare in the Black Hills. This is so far the only locality in the Black Hills. Streak alone is not enough to distingish it from Columbite but can eliminate Cassiterite, which is usually colorless to very hard brownish red. This specimen streaks a hard black. Of course nothing is concrete with any of these black oxides in pegmatites so EDS is pretty much required. 

EDS Confirmed

Ixiolite

Formula
(Ta,Mn,Nb)O2 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Irregular Grains 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
gray, black, steel gray 
Streak
dark brown 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal - Uneven 
Hardness
6-6.5 

Data courtesy of Webmineral.

Special Info
EDS Confirmed
Mineralpedia
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On Dakota Matrix
Previously Sold Ixiolite
On Dakota Matrix
Other Available Ixiolite
WebMineral
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Mindat
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