Twins in cryolite types from Ivigtut, South Greenland
The appearance of twins in various coarse grained types of cryolite from Ivigtut is illustrated. The examina-tion is based on large thin sections (from 5 cm to 12 cm across) of pure, white large-grained cryolite, similar large-grained cryolite from fluorspar-cryolite and from a vein of pure, black c...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.497.7543 2023-05-15T16:29:06+02:00 Twins in cryolite types from Ivigtut, South Greenland Hans Pauly Twl Tp The Pennsylvania State University CiteSeerX Archives 1978 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.497.7543 http://2dgf.dk/xpdf/bull27-noe-nygaard-7-14.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.497.7543 http://2dgf.dk/xpdf/bull27-noe-nygaard-7-14.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://2dgf.dk/xpdf/bull27-noe-nygaard-7-14.pdf text 1978 ftciteseerx 2016-01-08T08:52:14Z The appearance of twins in various coarse grained types of cryolite from Ivigtut is illustrated. The examina-tion is based on large thin sections (from 5 cm to 12 cm across) of pure, white large-grained cryolite, similar large-grained cryolite from fluorspar-cryolite and from a vein of pure, black cryolite in the wallrocks. The seven twin laws identified by Bøggild (1911, 1912) were found in most samples. The sample from fluorite-cryolite was dominated by the twin law (001) and the sample from the vein was dominated by [021]l2°. The general picture seems to favour a mechanical formation of all twins in the samples. The characteristic parting of cryolite is intimately related to the presence of twin lamellae, mainly as reported by Bøggild (1911, 1912), corresponding to the law [021]'20 but also (110) (Bøggild 1913), and (001) as observed in the sample from fluorite-cryolite here examined. This sample also contains indications for several stages of reorienta-tion presumably in response to outside stress situations. Text Greenland Unknown Greenland |
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ftciteseerx |
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English |
description |
The appearance of twins in various coarse grained types of cryolite from Ivigtut is illustrated. The examina-tion is based on large thin sections (from 5 cm to 12 cm across) of pure, white large-grained cryolite, similar large-grained cryolite from fluorspar-cryolite and from a vein of pure, black cryolite in the wallrocks. The seven twin laws identified by Bøggild (1911, 1912) were found in most samples. The sample from fluorite-cryolite was dominated by the twin law (001) and the sample from the vein was dominated by [021]l2°. The general picture seems to favour a mechanical formation of all twins in the samples. The characteristic parting of cryolite is intimately related to the presence of twin lamellae, mainly as reported by Bøggild (1911, 1912), corresponding to the law [021]'20 but also (110) (Bøggild 1913), and (001) as observed in the sample from fluorite-cryolite here examined. This sample also contains indications for several stages of reorienta-tion presumably in response to outside stress situations. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Hans Pauly Twl Tp |
spellingShingle |
Hans Pauly Twl Tp Twins in cryolite types from Ivigtut, South Greenland |
author_facet |
Hans Pauly Twl Tp |
author_sort |
Hans Pauly |
title |
Twins in cryolite types from Ivigtut, South Greenland |
title_short |
Twins in cryolite types from Ivigtut, South Greenland |
title_full |
Twins in cryolite types from Ivigtut, South Greenland |
title_fullStr |
Twins in cryolite types from Ivigtut, South Greenland |
title_full_unstemmed |
Twins in cryolite types from Ivigtut, South Greenland |
title_sort |
twins in cryolite types from ivigtut, south greenland |
publishDate |
1978 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.497.7543 http://2dgf.dk/xpdf/bull27-noe-nygaard-7-14.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
http://2dgf.dk/xpdf/bull27-noe-nygaard-7-14.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.497.7543 http://2dgf.dk/xpdf/bull27-noe-nygaard-7-14.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766018792858583040 |