Aldermanite, a New Magnesium Aluminium Phosphate

I. R. Harrowfield, E. R. Segnit and J. A. Watts
CSIRO Division of Mineral Chemistry, Port Melbourne, Australia

Abstract: A new magnesium aluminium phosphate mineral with the ideal formula Mg5Al12(PO4)4(OH)22·nH2O (n ⋍ 32) has been named aldermanite. It occurs as minute talc-like flakes, partly as an alteration product of fluellite, thinly coating cracks and cavities in a brecciated metamorphosed rock phosphate at Moculta, South Australia. Strongest X-ray diffraction lines are 13.40 Å (100) 002, 7.98 Å (80) 011, 5.55 Å (60) 210; unit cell parameters a= 15.00±0.007, b=8.330±0.006, c= 26.60±0.01 Å, Z = 2.

Mineralogical Magazine; March 1981 v. 44; no. 333; p. 59-62; DOI: 10.1180/minmag.1981.44.333.08
© 1981, The Mineralogical Society
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