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• W2186267998 abstract "A largely perthitic intergrowth from a granitic pegmatite in the island of Pellotsalo, Lake Ladoga, U.S.S.R., has been re-investigated. The specimen is from the same crystal used by Brown & Bailey (1964) to isolate their original Pellotsalo microcline. Microprobe analyses gave Orrr.urAbr.,oAno.65Cne.q2Rbf6.21 (mol. 9o) for the K-rich phase and Orl.o5Abe!.07Ane.s6 (mol.9o) for the Na-rich phase. The crystal structure ofthe K-rich phase was refined to a value of R of 0.027 for 1232 observed diffractionmaxima. The new structural data are very similar to those of the Prilep (Strob 1983) and Pikes Peak @lasi el al. 1984b) specimens and provide much the same response as the me1ric properties. On the assumption of complete Si,Al order, these specimens giry mean AI-O and Si-O distances equal to 1.738 and I .614 A, respectively. These values are slightly different from those found in Na-rich feldspar and should be used for converting mean f'O distances to Al contenn in K-rich feldspar alone. The contrasting genetic interpretations formulated concerning the Pellotsalo feldspar during this century are due to the ambiguous occurrence of irregular patches of cross-hatching in the K-rich phase. The latter shows no evidence of monoclinic ancestry in singlecrystal X-ray photographs, but weak streaks from the coexisting Na-rich phase may be interpreted in favor of an incipient M-twinning as the result of exsolution in a monoclinic environmgnt. The implication of M-twinning, the high Na-content of the bulk composition (Oq2Ab27Ant mol.9o: Goldsmith & Laves 196l), the moderate enrichment in Rb and the low concentration of Ba in the K-rich phase suggest that lhe Pellotsalo microperthite formed at a temperature just above that of the C2/m- Cl inversion." @default.
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• W2186267998 date "1987-09-01" @default.
• W2186267998 modified "2023-09-23" @default.
• W2186267998 title "A re-examination of the Pellotsalo microcline; mineralogical implications and genetic considerations" @default.
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