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Dufrénite
A valid IMA mineral species - grandfathered
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Colour:
Dark green, olive-green, olive-brown, black; olive-brown to reddish brown with oxidation; bluish green to reddish brown or yellow in transmitted light.
Lustre:
Sub-Vitreous, Resinous, Silky
Hardness:
3½ - 4½
Specific Gravity:
3.1 - 3.34
Crystal System:
Monoclinic
Member of:
Name:
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.)
The mineral dufrénoysite is also named in his honor.
The mineral dufrénoysite is also named in his honor.
Co-Type Localities:
Isostructural with:
A secondary mineral occurring with limonite in gossan of veins and in iron ore deposits.
See alsonatrodufrénite which is visually indistinguishable from dufrénite and appears to be much more common than presently thought (Henry Barwood, unpubl. results).
A (formally) vacancy- andMn2+-dominant member was reported by Sejkora et al. (2006).
Note: dufrénite is the correct spelling, not dufrenite (Burke, 2008).
There are some dufrenite-like species, e.g.,'UM1949-01-PO:Fe'.
See alsonatrodufrénite which is visually indistinguishable from dufrénite and appears to be much more common than presently thought (Henry Barwood, unpubl. results).
A (formally) vacancy- andMn2+-dominant member was reported by Sejkora et al. (2006).
Note: dufrénite is the correct spelling, not dufrenite (Burke, 2008).
There are some dufrenite-like species, e.g.,'UM1949-01-PO:Fe'.
![Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O](#"/photo-249592.html"><img src="/image.pl?url=https%3a%2f%2fwww.mindat.org%2fimagecache%2f08%2f4e%2f01329860017271922711085.jpg&f=jpg&w=240" alt="01329860017271922711085.jpg" /></a><div><b>Ours-Pierre-Armand Petit-Dufrénoy</b></div></div></div><div><div><span>Formula:</span><div class=){kind=link}