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- W2052902020 abstract "Synopsis Colourless, purple, and pink topaz and transparent quartz crystals have been found in calcite veins (with or without milky quartz) in calcareous rocks near Katlang (34° 24′ N, 72° 6′ E), Mardan district. The veins do not contain any fluorite nor the country rocks any topaz. The topaz and transparent quartz crystals are mostly broken and perfectly euhedral outlines are very rare. Refractive indices, 2V, specific gravity, and the fluorine (determined) and H 2 O + (calculated) contents of two topaz crystals are suggestive of their high 100 OH/(OH+F) ratios (> 25). Rather than being derived, the topaz may have formed in situ by hydrothermal/pneumatolytic activity, followed by tectonic movements that fractured the crystals and resulted in their incorporation in later-formed vein calcite." @default.
- W2052902020 created "2016-06-24" @default.
- W2052902020 creator A5082048286 @default.
- W2052902020 date "1979-03-01" @default.
- W2052902020 modified "2023-09-24" @default.
- W2052902020 title "Topaz occurrence in Mardan, north-west Pakistan" @default.
- W2052902020 doi "https://doi.org/10.1180/minmag.1979.043.325.20" @default.
- W2052902020 hasPublicationYear "1979" @default.
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