Macdonald, R., Saunders, M. J. (1973) Chemical variation in minerals of the astrophyllite group. Mineralogical Magazine, 39 (301) 97-111 doi:10.1180/minmag.1973.039.301.15
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Chemical variation in minerals of the astrophyllite group | ||
| Journal | Mineralogical Magazine | ||
| Authors | Macdonald, R. | Author | |
| Saunders, M. J. | Author | ||
| Year | 1973 (March) | Volume | 39 |
| Issue | 301 | ||
| Publisher | Mineralogical Society | ||
| Download URL | https://rruff.info/doclib/MinMag/Volume_39/39-301-97.pdf+ | ||
| DOI | doi:10.1180/minmag.1973.039.301.15Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 6644 | Long-form Identifier | mindat:1:5:6644:4 |
| GUID | 0 | ||
| Full Reference | Macdonald, R., Saunders, M. J. (1973) Chemical variation in minerals of the astrophyllite group. Mineralogical Magazine, 39 (301) 97-111 doi:10.1180/minmag.1973.039.301.15 | ||
| Plain Text | Macdonald, R., Saunders, M. J. (1973) Chemical variation in minerals of the astrophyllite group. Mineralogical Magazine, 39 (301) 97-111 doi:10.1180/minmag.1973.039.301.15 | ||
| In | (1973, March) Mineralogical Magazine Vol. 39 (301) Mineralogical Society | ||
| Abstract/Notes | SummaryEight new and fourteen published analyses of astrophyllites are used to examine chemical variation within the group. Al, Ca, Cs, F, Mg, Mn, Nb, Rb, Sn, Zn, and Zr may all substitute in moderate to large amounts in the unit cell, whose basic formula is (K,Na)3Fe7Ti2Si8(O,OH)31; the natural Mn- and Nb- analogues of astrophyllite have been recorded. Ba, Cl, Cu, Li, P, Pb, Sr, and Ta are present, but in smaller amounts. The majority of specimens show appreciable cation deficiencies, up to 5 % of sites remaining vacant. Astrophyllites from undersaturated igneous rocks are characterized by higher Al, Ca, Mg, Mn, (OH+F), (K+Na) and Zr, and lower Li, Pb, and Zn contents than those from oversaturated igneous rocks. A ‘high-alkali’ type of astrophyllite is distinguished. A new occurrence of nigerite is noted. | ||
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