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Ixiolite

#57220
SOLD
Ixiolite from Helen Beryl mine, Custer Co., South Dakota, United States - 57220
Ixiolite from Helen Beryl mine, Custer Co., South Dakota, United States - 57220

Ixiolite

#57220
Availability
Sold
Size
6 x 5 x 3 cm - Sm Cabinet 
Formula
(Ta,Mn,Nb)O2 (RRUFF)
Locality
Helen Beryl mine, Custer Co., South Dakota, United States
Tagged
pegmatite mineral

Large black crystal suspended in Microcline. There are some faces.

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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