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Fritsch, E. & Ivey, J. (2018) Bumble Bee Stone: A Bright Yellow-to-Orange and Black Patterned Gem from West Java, Indonesia. Journal of Gemmology, 36 228–238.
Added by: Richard Baschera (2019-04-25 13:20:03) Last edited by: Richard Baschera (2019-04-25 13:21:49) |
| Type de référence: Article DOI: 10.15506/JoG.2018.36.3.228 Clé BibTeX: Fritsch2018a Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, MIOPS Créateurs: Fritsch, Ivey Collection: Journal of Gemmology |
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Bumble Bee Stone (BBS) is a bright yellow-to-orange and black patterned gem material. Although sometimes referred to as a jasper, it is actually a carbonate-rich rock rather than a silica-based gem. It is mined from sulphide-bearing veins near an active volcano in West Java, Indonesia. Its most remarkable characteristic is its bright yellow colour, which is caused by the presence of an unexpected sulfide, pararealgar. The orange colour in some samples consists of a mixture of pararealgar with realgar. Both minerals are polymorphs of As4S4, arsenic sulphide. Areas of black colouration are due to aggregates of micron-sized pyrite crystals ('sooty' pyrite). The successive growth layers, when cut through in different orientations, give rise to a variety of attractive patterns. BBS has been mined for the past 15 years, and new veins are still occasionally found. (C) 2018 The Gemmological Association of Great Britain
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