phosphophyllite


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phosphophyllite

[‚fäs·fō′fi‚līt]
(mineralogy)
Zn2(FeMn)(PO4)2·4H2O Colorless to pale-blue mineral composed of hydrous zinc ferrous iron manganese phosphate; exhibits micalike cleavage.
References in periodicals archive ?
2[Zn.sup.2+] + [Fe.sub.2]+ + 2[H.sub.2]P[O.sub.4.sup.-] + 4[H.sub.2]O [right arrow] [Zn.sub.2]Fe[(P[O.sub.4]).sub.2].4[H.sub.2]O (Phosphophyllite) + 4[H.sup.+] (2)
The protagonist is Phosphophyllite, the weakest of the Lustrous and the only one without a job or purpose.
The phosphate coating enriched with a phosphophyllite structure showed small globular crystals with less porosity, whereas a hopeite structure showed coarse crystals with high porosity and comparatively thicker coating.
Intrepid traveler Alfredo Petrov (alfredo@mindat.org), who seems to have visited every time zone on earth, had some interesting phosphophyllite psuedomorphs after marine fossils.
X-ray diffraction equipment is less apt to be found in the analytical lab of a paint supplier or user, but it commonly is used to identify the different crystalline phosphates produced by the zinc phosphating process, such as hopeite ([Zn.sub.3][([P0.sub.4]).sub.2] * 4[H.sub.2]0) and phosphophyllite ([Zn.sub.2]Fe[([P0.sub.4]).sub.2] * 4[H.sub.2]0).
In that case, the phosphated layer is essentially composed of hopeite ([Zn.sub.3][(P[O.sub.4]).sub.2], 4[H.sub.2]O) and of phosphophyllite ([Zn.sub.2]Fe[(P[O.sub.4]).sub.2], 4[H.sub.2]O).
Otherwise we could perhaps breed a few more phosphophyllite twins.
(3) The main crystalline components of zinc phosphate layers are hopeite ([Zn.sub.3](P[O.sub.4])2*4[H.sub.2]O and phosphophyllite ([Zn.sub.2]Fe(P[O.sub.4])[.sub.2]*4[H.sub.2]O).
The report from the 2009 Tucson Show (May-June 2009) mentioned the newly discovered occurrence of phosphophyllite in Bolivia, represented then by a few miniature-size specimens being offered by two or three dealers.
The actual-size depiction is good for specimens that are full-page size, but what is the point of showing a 0.8-inch image of a phosphophyllite crystal or a 1.4-inch image of an andalusite crystal, each sitting totally alone (except for some caption text) on big black 12 X 13-inch pages?
Very hot news, now, from Bolivia: there is a brand-new locality in that country for phosphophyllite. No, the new specimens are not anything like, and do not rival in glamour, the fabulous blue-green gemmy twins found in the early 1960s in the Unificada mine, Cerro Rico de Potosi; rather, this phosphophyllite is more humble-looking and hails from a recently worked surface prospect at the Infiernillos mine, Canutillos, Colavi district, Potosi.
The classic German specimen which I found most remarkable among the many at Herr Zecha's stand is a 6-cm mass of phosphophyllite crystals from Hagendorf-Sud, Bavaria, sporting sharp, individual, pale green crystals to 1 cm.