Diasporescence in rubies from Prilep dolomitic marble

Miha Jeršek

Abstract


Rubies from the Prilep dolomitic marble contain numerous diaspore inclusions, resulting from oriented intergrowth with corundum. In the world of gemstones, this phenomenon has been recognized as diasporescence, which has to date been researched only in the cases of corundum crystals from Macedonia. The paper describes the importance of diasporescence for the appearance and thus the quality of rubies, in which the inclusions of diaspore are also a distinctive character for the determination of the origin of this renowned gemstone. Diaspore is colourless to white and affect on intensity of red to pink colour of ruby as a gem.  Macedonian rubies are the only rubies from around the world with inclusions of diaspore and that´s why also the only rubies with optical phenomena diasporescence.

Keywords


ruby, marble, diasporescence, Sivec, cutting

Full Text:

PDF

References


R. Stojanov, Prethodni rezultati od geološkite i petrografskite istražuvanja na visokometamornite steni vo centralniot del na Pelagonski masiv, Geološki Zavod na HPM, 7, 147 – 177 (1960).

Lj. Barić, Dolomitmarmor in der Umgebung der Stadt Prilep und die in ihm vorkommenden Minerale, Tschemarks Miner. U. Petrogr. Mitt., Wien, 13, 233 – 249 (1969).

M. Žorž, M. Jeršek, G. Mladenovski, Some mineral locations and their paragenesis, Scopollia, Supll. 2, 9 - 63 (1999).

Lj. Barić, Diaspor, ein ungewöhnlich grosser Kristall aus dem Dolomit-Steinbruch Sivec unweitvon Prilep in Mazedonien, Jugoslawien, Lapis, 4, No.11, 25 (1979).

M. Jeršek, B. Mirtič, Corundum from Prilep Dolomitic Marble, Scopolia, 41, 1 – 22 (1999).

Lj. Barić, Optische Eingeschaften des Diaspors von Sivec unweit von Prilep in Mazedonien, Bulletin Scientifique Yugoslavie, 5, No. 3, 71 (1960).

Lj. Barić, Über die orientirte Verwachsung des diaspors und des Korunds von Sivec in Mazedonien, Beiträge zur Mineralogie und Petrographie, 9, 133 – 138 (1960).

J M. Jeršek, B. Mirtič, Diasporescenca prilepskih rubinov – nov optični pojav v svetu dragih kamnov, Geološki zbornik, 13, 67 – 72 (1997).

M. Dobnikar, E. Ferme, M. Humar, S. Simona, M. Jeršek, D. Mlakar, B. Razinger, M. Šturm, Gemološki terminološki slovar, Založba ZRC, ZRC SAZU, Ljubljana, 2013.

W. F. Eppler, Praktische Gemmologie, Rühle – Diebner –Verlag, Stuttgart, 1989.

U. Henn, Gemmologisches Praktikum, Eine Sonderveröffentlichung von Gold + Silber + Uhren + Schmuck, Robert Kohlhammer GmBH, Leinfelden – Echterdingen, 1990.

J. E. Arem, Color Enclclopedia of Gemstones, Van Nostrand Reinhold, New York, 1987.

E. J. Gübelin, J. I. Koivula, Photoatlas of Inclusions in Gemstones, ABC Edition, Zürich, 1997.

M. Jeršek, Dragi in okrasni kamni z osnovami brušenja kabošonov, Visokošolsko središče, Sežana, 2010.




DOI: http://dx.doi.org/10.20450/mjcce.2015.671

Refbacks

  • There are currently no refbacks.




Copyright (c) 2016 Miha Jeršek

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.