Aluminium-bearing strunzite derived from jahnsite at the Hagendorf-Sud pegmatite, Germany

作者：Grey I E^*; Macrae C M; Keck E; Birch W D

来源：Mineralogical Magazine, 2012, 76(5): 1165-1174.

DOI：10.1180/minmag.2012.076.5.08

• Al-bearing strunzite
• strunzite paragenesis
• strunzite structure refinement
• Hagendorf Sud secondary phosphates

Aluminium-bearing strunzite, [Mn0.65Fe0.26Zn0.08Mg0.01](2+)[Fe1.50Al0.50](3+)(PO4)(2)(OH)(2)center dot 6H(2)O, occurs as fibrous aggregates in a crystallographically oriented association with jahnsite on altered zwieselite samples from the phosphate pegmatite at Hagendorf Sud, Bavaria, Germany. Synchrotron X-ray data were collected from a 3 mu m diameter fibre and refined in space group P (1) over bar to R-1 = 0.054 for 1484 observed reflections. The refinement confirmed the results of chemical analyses which showed that one quarter of the trivalent iron in the strunzite crystals is replaced by aluminium. The paragenesis revealed by scanning electron microscopy, in combination with chemical analyses and a crystal-chemical comparison of the strunzite and jahnsite structures, are consistent with strunzite being formed from jahnsite by selective leaching of (100) metal-phosphate layers containing large divalent Ca and Mn atoms.

• 出版日期2012-10
• 单位CSIRO