Botgon bag, Mankhan Soum, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia
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The amphibole is riebeckite-arfvedsonite. Astrophyllite is rich in Fe, Zr, Nb, with traces of Rb.
13 entries listed. 9 valid minerals.
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Žáček, V., Buriánek, D., Pécskay, Z., Škoda, R. (2016): Astrophyllite-alkali amphibole rhyolite, an evidence of early Permian A-type alkaline volcanism in the western Mongolian Altai. Journal of Geosciences: 61: 93-103; http://forum.amiminerals.it/viewtopic.php?f=5&t=12611 (2016)