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|Colour:||steel gray, lead gray||Lustre:||Metallic, Sub-Metallic|
|Name:||Named in 1958 by Ivan Kostov in honor of Georgi Bonchev [August 6, 1866 Zheravna, Kotel, Bulgaria - March 7, 1955 Sofia, Bulgaria] systematic mineralogist and professor at University of Zagreb and for most of his career at University of Sofia, Bulgaria. Bonchev received many academic honors and was also proficient in gemology and geoarcheology. |
Fleischer (1958) compared the x-ray pattern of bonchevite to those of galenobismuthite and "bismuthinite" and noted their similarities. Nechelyustov and Lebedev (1967) described a "bonchevite" from Kara-Oba, Kazakhstan with x-ray and chemical data similar to Bulgarian bonchevite. Craig (1967) discovered that phases in the PbS-Bi2S system exsolved to a mixture of "bismuthinite" and galenobismutite. Kupcik et al. (1969) studied topotype bonchevite and found their specimen was a mixture of galenobismuthite and a member of the andorite group. Bonev (1982) identified the unknown Kara-Oba mineral as lillianite. Birch and Mumme (1985) also studied a mineral they collected "from a vein north of Nahrechen" and they concluded their specimen was pekoite - "No inclusions were observed." Birch and Mumme (1985) concluded that a near equal mixture of pekoite and galenobismuthite would yield the reported chemical composition reported for bonchevite and by extension that the mixture was possibly a homogenous phase that exsolved into the two phases that were consistently observed in synthetic and natural specimens.
|A Mixture Of:||Galenobismutite, Pekoite|
This page provides mineralogical data about Bonchevite.
Classification of Bonchevite
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Physical Properties of Bonchevite
|Colour:||steel gray, lead gray|
|Comment:||May show patchy blue to blue iridescence, etc.|
Other Names for Bonchevite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Bonchevite
Kostov, Ivan (1958) Mineralogical Magazine, v. 31, p. 821-.
Fleischer, Michael (1958) American Mineralogist, v. 43, p. 1221-1222.
Craig, J. R. (1967) Mineral Deposita, v. 1, p. 278-306.
Nechelyustov, G. N. and Lebedev, V. S. (1967) Dokl. Acad. Nauk SSSR, v. 174, p. 679.
Kupcik, V., Franc, L., and Makovicky, E. (1969), Tschermaks Min. Pet. Mitt., v. 13, p. 149
Bonev, I. (1982) Excursion Guide (Central Rhodopes), 13th General meeting of the IMA, Varna, Bulgaria, p. 22.
Birch, William D. and Mumme, W. G. (1985) Pekoite from Narechen, Bulgaria - a Possible Solution to the Bonchevite Problem, Mineralogical Magazine, v. 49, p. 135-137.
Internet Links for Bonchevite
Localities for Bonchevite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Paranhos da Beira, Seia, Guarda District, PortugalFrom Rui Nunes, 21st Nov 2014 12:15:49