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avatar Ferristrunzite
April 14, 2009 07:49AM
    
Click here to view Best Minerals F and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.


Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities?

Ferristrunzite
Fe3+3[OH|PO4]2-5(H2O,OH)
Triclinic

Ferristrunzite with Cacoxenite from the Type Locality, Blaton Belgium, FOV 1cm© Harjo


Ferristrunzite is triclinic, and it could be considered as the oxidation product of ferrostrunzite. It forms aggregates and crusts of light-yellow to brownish prismatic crystals, in random orientations as well as in spherical aggregates. Many crystals are bent or deformed.


Ferristrunzite
Belgium
Hainaut (Henegouwen; Hennegau) Province, Mons, Blaton, Mont-des-Groseillers


FOV 0,8cm Ferristrunzite,Cacoxenite© Harjo
FOV 0,3cm Ferristrunzite© JM. Johannet

FOV 0,8cm Ferristrunzite,Beraunite,Strengite© Harjo
3,5x2,5x1,5cm Ferristrunzite© 2002 John H. Betts

In 1956 R. Van Tassel started a comprehensive study of the Mont-des-Groseillers in Blaton, Belgium. Due to the construction of the Nimy-Blaton Canal, an interesting geological profile of 25 m thickness was exposed over a length of nearly 1000 m. This whole zone contained a spectacular phosphate paragenesis.
The first mineral he described was crandallite, and later on a whole list of other minerals followed. One of those was a "manganese-free strunzite". Many years later, in 1983, Peacor et al. described the new mineral and not only confirmed the absence of Mn, but also proved that all the iron present was trivalent, and the X-ray diffraction pattern differed significantly from that of strunzite.
Other minerals that occur at the Blaton site are crandallite, minyulite, strengite, phosphosiderite, cacoxenite, beraunite, rockbridgeite, whitmoreite, mitridatite, vivianite, destinezite, allophane/evansite, gypsum and barite.
[Rik Dillen]

It is no longer allowed to collect minerals along the banks of the canal at Mont-des-Grosseillers.


Ferristrunzite
Belgium
Namur Province, Anhée, Haut-le-Wastia


FOV 0,2cm Ferristrunzite,Cacoxenite© JDehove
FOV 0,6cm Ferristrunzite,Cacoxenite© JDehove

Ferristrunzite from Haut-le-Wastia was described by Dillen and Van Goethem in 1990, the small crystals that occur in narrow cracks can get up to up to 1mm long.


Ferristrunzite
Germany
North Rhine-Westphalia, Wuppertal, Aprath castle, B224 Road cut


FOV 0,35cm Ferristrunzite,Cacoxenite© mk
FOV 0,4cm Ferristrunzite© Leon Hupperichs

During road construction works near the castle of Aprath a small Phosphate mineralised zone was encountered in the slate. Other minerals found on the site where: Cacoxenite, Beraunite and Strengite (the find of Evansite remains questionable) The locality is no longer accessible.


Ferristrunzite
Germany
Bavaria, Upper Palatine, Oberpfälzer Wald, Vohenstrauß, Waidhaus, Silbergrube


Aplite quarry working the remains of a now largely eroded granitic pegmatite.
Located 1 km W of Waidhaus and around 10 km ENE of Vohenstrauß.

Can anyone help us with information and photographs of specimens from this locality?


Ferristrunzite
United Kingdom
England, Cornwall, St Agnes District, Perranzabuloe, Gravel Hill Mine


Gravel Hill mine worked the western end of the Great Perran Iron lode. Which has been worked inland by several mines for traced distance of about 5kms. At Gravel Hill the lode was developed by a beach adit and shafts on the cliff top. The lode was also worked about 155mts inland in an opencast called the Big Iron Pit. The Iron lode is crossed by a N-S lead lode worked a short distance to the north in Wheal Phoenix, and East Wheal Golden. Gravel Hill is know to have been at work befor 1728, also in the 1860's; and from 1874-82. Output figures are only avalible for the last working. When it produced about 8000 tons of iron ore, and 30 tons of zinc ore.

Can anyone help us with information and photographs of specimens from this locality?


Ferristrunzite
USA
Wisconsin, Rusk Co., Ladysmith, Flambeau Mine


Mined by Kennecott Copper between 1993 to 1997. Site has since been completely restored. This is the only mining of massive sulfides in Wisconsin (other deposits have been drilled, but there are no plans to mine them). Ore was rich enough to ship directly to the smelters without having to be concentrated.

Can anyone help us with information and photographs of specimens from this locality?


[Harjo Neutkens 2009]



Click here to view Best Minerals F and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.



Edited 21 time(s). Last edit at 11/27/2010 11:00PM by Harjo Neutkens.
avatar Re: Ferristrunzite
April 14, 2009 08:53AM
Harjo, Wow, great images. At the rate you are going we will have Best minerals finished in a few years and here I thought I would die long before it was anywhere near finished.

Rock Currier
Crystals not pistols.
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