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Dufrenite - Hoff auf mich Mine, Ullersreuth, Hirschberg, Vogtland, Thuringia, Germany /Type Locality)
(#:MINS7960)
Spherical aggregates of Dufrenite up to 3 mm wide on matrix from the type locality.
Formula :
Fe
2+
(Fe
3+
,Al)
4
[(OH)
5
/(PO
4
)
3
] * 2 H
2
O
System:
monoclinic
Hardness:
3½-4
Rarity:
not common
Strunz id:VII/D.11-110 - PHOSPHATES, ARSENATES and VANADATES
Name origin:
Named in 1833 by Alexandre Brongniart in honor of Ours Pierre Armand Petit Dufrenoy [September 5, 1792 - March 20, 1857), Professor of Mineralogy in the École des Mines, Paris, France. (Because of many look-alike species in the environments where dufrénite occurred, species such as rockbridgeite, etc. were called by that name.)
Specimen weight:23 gr.
Crystal size:up to 3 mm
Overall size: 42mm x 20 mm x 30 mm
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