Summary: Compositions of nine hydrous aluminium phosphates are considered with respect to the Al, P, and H contents per 8 oxygens, and it is suggested that when the ratio (Al. P)/H is less than 0·11 (or (Al.P2)/H2 is less than 0·01 such compositions do not crystallize. Examples are bolivarite and evansite.
Mineralogical Magazine; June 1976 v. 40; no. 314; p. 609-610; DOI: 10.1180/minmag.1976.040.314.08
© 1976, The Mineralogical Society
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