Bismutopyrochlore (of Chukanov et al.)

Type Locality

Mika pegmatite, Rangkul' Highlands, Pamir Mts, Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni), Tajikistan

Mineral Data

(Bi,U,Ca,Pb)_1+x(Nb,Ta)₂O₆(OH)·nH₂O

Variety Of:

Strunz:

4.DH.15

Physical Properties

Colour:

Black

Crystal System:

Amorphous

Streak:

Yellow

Hardness:

5.0

Synonyms

Synonyms:

Bismutopyrochlore

Tabs

References

Mindat URL:

http://www.mindat.org/min-7065.html