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Rammelsbergite with Nickeline & Safflorite

#RW50109

Rammelsbergite with Nickeline & Safflorite

#RW50109
Availability
Sold
Size
11 x 8 x 1.5 cm - Cabinet 
Formula
NiAs2 (RRUFF)
Locality
Langis mine, Cobalt dist., Ontario, Canada
Tagged
ore mineral , sulfide , nickel

A large, heavy slab of ore polished on one side. The ores of Cobalt were often slabbed for the geologist to determine the ore characterization such as the texture, how it was mineralized and paragenesis. Rammelsbergite is an ore of nickel and is a nickel arsenide. It is also a member of the Lollingite group. The Rammelsbergite occurs as silvery white anhedral grains to over 1cm. Nickeline, another nickel arsenide, can be seen as brassey or coppery red cores in the Rammelsbergite. Beyond that description, it is impossible to determine visually the phases from one mineral to the other without EDS or microprobe as in the case of the Safflorite, which contains nickel but also cobalt and iron. 

Rammelsbergite

Formula
NiAs2 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Radial, Massive - Granular 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
tin white, reddish white 
Streak
grayish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
5.5 

Data courtesy of Webmineral.

Collection
Robert J. Waidler Collection

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