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Frondelite with Rockbridgeite & Hureaulite

#DP51086

Frondelite with Rockbridgeite & Hureaulite

#DP51086
Availability
Sold
Size
11 x 8 x 5 cm - Cabinet 
Formula
Mn2+Fe3+4(PO4)3(OH)5 (RRUFF)
Locality
Fletcher mine, Groton, Grafton Co., New Hampshire, United States
Tagged
phosphate , pegmatite

Outstanding pegmatite specimen created by metasomatic alteration of parent Triphylite. The compact, embedded black fibrous crystals are Rockbridgeite, while the brown is Frondelite. Both are end members. The pink is Hureaulite.

Frondelite

Formula
Mn2+Fe3+4(PO4)3(OH)5 
Crystal System
Orthorhombic 
Cleavage
Perfect, Distinct, Distinct 
Luster
Vitreous - Dull 
Color
brown, brown green, brownish black, green black, dark green 
Streak
brownish gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Uneven 
Hardness
4.5 

Data courtesy of Webmineral.

Collection
Don Phillips Collection

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