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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005 20190221172032.0
008 190110s1995 caua 0 0 eng d
040 |a ViAlAGI  |c ViAlAGI 
072 7 |a 28A  |2 georeft 
072 7 |a 01B  |2 georeft 
100 1 |a Sariiz, Kadir  |e analytic author  |u Osmangazi University, Department of Mining Engineering, Eskisehir 
245 1 0 |a Meerschaum from Eskisehir Province, Turkey 
300 |a p. 42-51 
500 |a In English. 12 refs. 
500 |a Abstract number: 95M/4339 
500 |a Abstractor: R.A.H. 
500 |a Affiliation: Osmangazi University, Department of Mining Engineering; Eskisehir; TUR; Turkey 
500 |a Affiliation: Dumlupinar University; ; TUR; Turkey 
500 |a Key title: Gems and Gemology 
500 |a Source note: Gems and Gemology, 31(1), p.42-51. Publisher: Gemological Institute of America, Santa Monica, CA, United States. ISSN: 0016-626X 
500 |a Publication type: journal article 
504 |b 12 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a 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. 
650 7 |a Cenozoic  |2 georeft 
650 7 |a Construction materials  |2 georeft 
650 7 |a Genesis  |2 georeft 
650 7 |a Lithostratigraphy  |2 georeft 
650 7 |a Mineral assemblages  |2 georeft 
650 7 |a Mining  |2 georeft 
650 7 |a Neogene  |2 georeft 
650 7 |a Occurrence  |2 georeft 
650 7 |a Ornamental materials  |2 georeft 
650 7 |a Physical properties  |2 georeft 
650 7 |a Pliocene  |2 georeft 
650 7 |a Production  |2 georeft 
650 7 |a Sedimentary rocks  |2 georeft 
650 7 |a Sepiolite  |2 georeft 
650 7 |a Sheet silicates  |2 georeft 
650 7 |a Silicates  |2 georeft 
650 7 |a Tertiary  |2 georeft 
650 7 |a Textures  |2 georeft 
651 7 |a Asia  |2 georeft 
651 7 |a Eskisehir Turkey  |2 georeft 
651 7 |a Middle East  |2 georeft 
651 7 |a Turkey  |2 georeft 
653 |a Imisehir Conglomerate 
700 1 |a Isik, Iskender,  |e analytic author  |u Dumlupinar University 
773 0 |t Gems and Gemology  |d Santa Monica, CA : Gemological Institute of America, 1995  |x 0016-626X  |y GEGEA2  |n Gems and Gemology, 31(1), p.42-51. Publisher: Gemological Institute of America, Santa Monica, CA, United States. ISSN: 0016-626X Publication type: journal article  |g Vol. 31, no. 1  |h illus., incl. sect., 1 table, sketch map