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Melonjosephite in Triphylite

#BN50636

Melonjosephite in Triphylite

#BN50636
Availability
Sold
Size
2 x 1.5 x 2 cm - Thumbnail 
Formula
CaFe2+Fe3+(PO4)2(OH) (RRUFF)
Locality
Sandamap pegmatite, Dâures, Erongo, Namibia
Tagged
phosphate , pegmatite mineral

There is a single 0.75mm black crystal at the arrow plus a black zone, which is probably also Melonjosephite. The matrix is Triphylite, perhaps partially altered to Melonjosephite. The type locality description notes that Melonjosephite is an alteration of an Alluaudite group member. But, it is interesting to note that at the type locality, Angarf-South pegmatite, Alluaudite is not found (according to Mindat). Furthermore, Alluaudite is only noted at only two of the five pegmatites where Melonjosephite is found. So it may be worth examining your specimens of Melonjosephite to determine which Alluaudite group mineral is associated.

Melonjosephite

Formula
CaFe2+Fe3+(PO4)2(OH) 
Crystal System
Orthorhombic 
Cleavage
Perfect, Indistinct, None 
Luster
Adamantine - Greasy 
Color
dark green, black 
Streak
greenish 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection

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