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Dissakisite-(La) with Bastnesite-(La)

#BAC62347

Dissakisite-(La) with Bastnesite-(La)

#BAC62347
Availability
Sold
Size
0.8 x 1 x 0.3 cm - Thumbnail 
Formula
CaLaAl2MgSi3O12(OH) (RRUFF)
Locality
Mochalin Log, Kyshtym, South Urals, Russia
Tagged
REE mineral

Black to brown resinous mass of undifferentiated Dissakisite-(La) and Bastnasite-(La). Dissakisite-(La) is found at three localities worldwide and is a member of the Allanite group.

Dissakisite-(La)

Formula
CaLaAl2MgSi3O12(OH) 
Crystal System
Monoclinic 
Crystal Habit
Aggregates, Inclusions, Anhedral Grains 
Cleavage
Imperfect, None, None 
Luster
Vitreous (Glassy) 
Color
black, very dark brown 
Streak
pale greenish gray 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
6.5-7 

Data courtesy of Webmineral.

Collection
William & Anne Cook Collection

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