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Topaz occurrence in Mardan, north-west Pakistan

Published online by Cambridge University Press:  05 July 2018

M. Qasim Jan
M. Qasim Jan*
Affiliation:
Department of Geology, University of Peshawar, Pakistan
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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 H2O + (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.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 325 , March 1979 , pp. 175 - 176
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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References

Bank, (H.), 1976. Z. Deutsch. Gemmologischen Gesell. 25, 41.Google Scholar
Batekhtin, (a.), Undated. A course of Mineralogy (Trans. from Eussian) Moscow (Peace Publishers)Google Scholar
Carrel, (R.P.), 1973. Unpub. Rept. Directorate of Commerce, Industr. Min. Devel., Govt. NWFP., Pakistan.Google Scholar
Chaudhry, (M.N.) and Howie, (R.A.) 1970. Mineral. Mag. 37, 117-20.Google Scholar
Deer, (W.A.), Howie, (R.A.) and Zussman, (J.), 1962 Rock-forming Minerals l, London (Longmans).Google Scholar
El-Hinnawi, (E.E.) and Hofmann, (R.), 1966. Chem. der Erde 25, 230-6.Google Scholar
Hall, (A.) and Welsh, (J.N.), 1969. Anal. Chim. Acta, 45, 341-2.CrossRefGoogle Scholar
Jan, (M.Q.), Kempe, (D.R.C.) and Symes, (R.F.), 1972. Mineral Mag. 39, 756-9.CrossRefGoogle Scholar
Joshi, (M.S.) and Taku, (R.K.), 1971. J. Gemmology, 12, 346-53.CrossRefGoogle Scholar
Kempe, (D.R.C.), 1973. Geol. Mag. 110, 385-95.CrossRefGoogle Scholar
Martin, (N.R.), Siddiqui, (S.F.A.) and King, (B.H.), 1962 Geol. Bull. punjab Univ. 2, 1-13Google Scholar
Palache, (C.), Berman, (H.) and Frondel, (C.), 1960. Dana's System of Mineralogy, 2, 7th ed. New York (Wiley)Google Scholar
Petrov, (I.) Schemetzer, (K.) and Bank, (H.), 1977a. Neues Jahrb. Min., Mh., 483-4.Google Scholar
Petrov, (I.) Schemetzer, (K.) and Bank, (H.) 1977b. Z. Deutsch. Gemmologischen Gesell., 26, 152-6.Google Scholar
Ribbe, (P.H.) and Rosenberg, (P.E.), 1971. Am. Mineral. 56, 1812-21.Google Scholar
Rosenberg, (P.E.), 1967. Am. Mineral. 52, 1890-5.Google Scholar
Rosenberg, (P.E.), 1969. Geol. soc Am Abs. 7, 192-3.Google Scholar