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Fillowite

#45211

Fillowite

#45211
Availability
Sold
Size
3 x 3.5 x 1.5 cm - Miniature 
Formula
Na2CaMn2+7(PO4)6 (RRUFF)
Locality
Kiluli, Western prov., Rwanda
Tagged
phosphate , pegmatite mineral

Glassy dark green partly yellowish green crystalline mass. Originally found in the Fillow lithium pegmatite of Branchville, CT and published by Brush and Dana in 1879. It is rare having been found in less than 15 occurences worldwide. The original description makes reference to an unknown substance which may be an oxidation product on the Fillowite from Branchville. This specimen also has a white caking on the outer edge of the weathered side of the Fillowite. Perhaps this is the same sort of white material reported by Dana. It appears that the Fillowite oxidizes and perhaps lead to secondaries. It is associated with probably Sicklerite and purple Heterosite.

Fillowite

Formula
Na2CaMn2+7(PO4)6 
Crystal System
Trigonal 
Crystal Habit
Granular, Euhedral Crystals 
Cleavage
Perfect, None, None 
Luster
Resinous - Greasy 
Color
yellow, reddish brown, colorless 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Brittle - Uneven 
Hardness
4.5 

Data courtesy of Webmineral.

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