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Bobfergusonite

#43690
SOLD
Bobfergusonite from Nancy pegmatite, Chacabuco dept., San Luis, Argentina - 43690
Bobfergusonite from Nancy pegmatite, Chacabuco dept., San Luis, Argentina - 43690

Bobfergusonite

#43690
Availability
Sold
Size
4.5 x 2.5 x 3 cm - Miniature 
Formula
Na2Mn2+5Fe3+Al(PO4)6 (RRUFF)
Locality
Nancy pegmatite, Chacabuco dept., San Luis, Argentina
Tagged
phosphate , pegmatite mineral

Bobfergusonite is a member of the Wyllieite group and is a Na-Mn-Fe phosphate. It forms nodules in pegmatites, much like most primary phosphates, a result of early crystallization and later altered by metasomatism while the remaining liquid cools and solidifies. It is remarkably similiar to Alluaudite. It is very rare and found in only two localities in the world.

Bobfergusonite

Formula
Na2Mn2+5Fe3+Al(PO4)6 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Luster
Resinous 
Color
greenish brown, reddish brown 
Streak
yellowish brown 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
4 

Data courtesy of Webmineral.

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