Meerschaum from Eskisehir Province, Turkey

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Authors:Sariiz, Kadir; Isik, Iskender
Author Affiliations:Primary:
Osmangazi University, Department of Mining Engineering, Eskisehir, Turkey
Other:
Dumlupinar University, Turkey
Volume Title:Gems and Gemology
Source:Gems and Gemology, 31(1), p.42-51. Publisher: Gemological Institute of America, Santa Monica, CA, United States. ISSN: 0016-626X
Publication Date:1995
Note:In English. 12 refs.; illus., incl. sect., 1 table, sketch map
Summary:In the vicinity of Eskisehir, the provincial capital, there are three major and two minor sepiolite districts, of which Turkmentokat-Gokceoglu is the most important as it produces meerschaum with superior whiteness, purity and ease of carving. The sepiolite occurs as nodules in Pleistocene conglomerates which also contain pebbles of peridotite, magnesite, serpentinite, etc. The sepiolite nodules are typically 8-10 cm in diameter; some contain a core of magnesite and a genetic relationship is deduced, the early magnesite being replaced by sepiolite. SEM shows the sepiolite to have a fibrous texture with fibres as wide as 0.5 µm and up to 35 µm long. The cement of the conglomerates contains dolomite, magnesite and minor opal-CT. The mining and carving of the sepiolite nodules are described; after carving the meerschaum is dried in an oven at 110°C and later immersed in heated, liquid beeswax for a few minutes before final polishing. The finished articles are a creamy white colour, but when used as a pipe bowl the meerschaum turns progressively darker yellow as it absorbs nicotine from the tobacco. [R.A.H.]
Subjects:Cenozoic; Construction materials; Genesis; Lithostratigraphy; Mineral assemblages; Mining; Neogene; Occurrence; Ornamental materials; Physical properties; Pliocene; Production; Sedimentary rocks; Sepiolite; Sheet silicates; Silicates; Tertiary; Textures; Asia; Eskisehir Turkey; Middle East; Turkey; Imisehir Conglomerate
Abstract Numbers:95M/4339
Record ID:1995055142
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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