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Author: Admin | 2025-04-28
And G. Claraz, Zeitschrift der Deutschen Geologischen Gesellschaft, Vol. 11, pp. 448-466, (1859). The authors, both Swiss naturalists who spent several years exploring the country, describe the setting of the gem deposits in Minas Gerais based on geological knowledge at that time.Estudo Geológico das Jazidas de Topázios da Província de Minas Gerais [Geological Study of the Topaz Deposits of the Province of Minas Gerais], H. Gorceix, Annaes da Escola de Minas de Ouro Preto, No. 1, pp. 15-38, (1881). A study by a noted geologist of the topaz deposits and principal mines located to the west of the town of Ouro Preto. A similar article by this author appeared in the Annales Scientifiques de l'École Normale Supérieure, Vol. 11, pp. 9-32, (1882).Über Euklas, Topas, Diamant und Pyrrhotin aus Brasilien [On Euclase, Topaz, Diamond, and Pyrrhotite from Brazil], A. Kenngott, Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, Pt. 1, pp. 187-191, (1884). This article contains a description of the morphology of a topaz crystal from the Capão mine.“Edelsteinkunde” [Precious Stones], M. Bauer, C.H. Taurchnitz, Leipzig, 711 pp., (1896). This book contains information of gem topaz and its worldwide occurrences on pages 371-386.On the Mode of Occurrence of Topaz near Ouro Preto, Brazil, O.A. Derby, American Journal of Science, Vol. 161, No. 61, pp. 25-34, (1901). The author provides a geologic description of the topaz occurrences.Mining for Gems in Brazil, A.S. Atkinson, Engineering and Mining Journal, Vol. 87, No. 25, pp. 1234-1235, (1909). The author briefly discusses topaz mining.Bemerkungen über Optische Anomalien, insbesondere des Brasilianer Topas [Remarks on Optical Anomalies, especially in Brazilian Topaz], F. Rinne, Zeitschrift für Kristallographie, Vol. 63, No. 3/4, pp. 236-246, (1926). Article not seen.The Gemstones of Brazil, F.M. Bastos, Gems & Gemology, Vol. 10, No. 7, pp. 195-201, (1961). A review of the gemstone deposits in the country including the topaz mines.Geology and Ore Deposits of the Cachoeira do Campo, Dom Bosco, and Ouro Branco Quadrangles, Minas Gerais, Brazil, R.F. Johnson, U.S. Geological Survey Professional Publication, Vol. 341-B, 39 pp., (1962). This publication contains a short section on Imperial topaz.The Topaz Mines of Ouro Preto, F.M. Bastos, Lapidary Journal, Vol. 18, No. 8, pp. 918-920, (1964). The author describes the topaz mining operations.Topaz, F.H. Pough, Lapidary Journal, Vol. 18, No. 8, pp. 852-854, 856, 858, 860, 862 and 864, (1964). A general review of gemological information on topaz and its occurrences.Paramagnetic Resonance of Metal Ions and Defect Centers in Topaz, A.C. Dickinson and W.J. Moore, Journal of Physical Chemistry, Vol. 71, No. 2, pp. 231-240, (1967). A spectroscopy study of the defect centers responsible for coloration in topaz.Farb und Farbveranderungen bei Topas [Color and Color Changes in Topaz], H. Bank, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Vol. 18,
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