Search Archived Mineral Specimens
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Sapucaia mine, Galileia, Doce valley, Minas Gerais, Brazil
- Formula
- Mn2+Fe3+4(PO4)3(OH)5
- Size
- SmCabinet 7x6x4cm
- Tagged
- phosphate , pegmatite
Nice specimen rich in Frondelite, the manganese end member of the Fondelite-Rockbridgeite Series. The Frondelite probably makes up most of the mass, but the crystals manifest themselves as 2-3mm to over 1cm platy embedded crystals. Frondelite occurs in manganese/iron rich phosphate bearing pegmatites probably derived from the metasomatism of Triphylite or other primary phosphate. Minor secondary phosphates can also be seen in the mass including phosphosiderite.
- Availability
- Sold
- Locality
- Fletcher mine, Groton, Grafton Co., New Hampshire, United States
- Formula
- Mn2+Fe3+4(PO4)3(OH)5
- Size
- Cabinet 11x8x5cm
- 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.
