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Mineralpedia Details for Bobfergusonite

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Bobfergusonite

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
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Bobfergusonite from Nancy pegmatite, Chacabuco dept., San Luis, Argentina

Bobfergusonite
            from Nancy pegmatite, Chacabuco dept., San Luis, Argentina

This is the second world locality for this primary phosphate mineral found in a pegmatite. It is a simple Na-Mn iron phosphate with two distinct cleavages and one known parting. The parting surfaces can be seen as flashes of reflections when the sample is tilted back and forth and are yellowish or bronzy color. It is a granular mineral, dark green, much like alluaudite.

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