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Eckermannite

#BM40988
SOLD
Eckermannite from Brunnsjögruvan, Grythyttan, Hällefors, Västmanland, Sweden - BM40988
Eckermannite from Brunnsjögruvan, Grythyttan, Hällefors, Västmanland, Sweden - BM40988

Eckermannite

#BM40988
Availability
Sold
Size
4 x 3 x 2.5 cm - Miniature 
Formula
NaNa2(Mg4Al)Si8O22(OH)2 (RRUFF)
Locality
Brunnsjögruvan, Grythyttan, Hällefors, Västmanland, Sweden

A pitch black platy sodium amphibole with tightly packed crystals to 1cm. Eckermannite is an uncommon member fot the amphibole group.

Eckermannite

Formula
NaNa2(Mg4Al)Si8O22(OH)2 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
blue green 
Streak
greenish white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
5-6 

Data courtesy of Webmineral.

Collection
McConlogue Collection
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