Occurrence of Leucite in Volcanic Rocks from Tristan da Cunha
DURING recent petrological research on volcanic rocks collected by the Royal Society Tristan da Cunha Expedition 1 , many specimens of varying composition have been found to contain leucite. The mineral occurs interstitially, is weakly birefringent with a high negative relief, and displays poorly de...
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| Veröffentlicht in: | Nature (London) 1963-01, Vol.198 (4882), p.779-780 |
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| creator | LE MAITRE, R. W GASS, I. G |
| description | DURING recent petrological research on volcanic rocks collected by the Royal Society Tristan da Cunha Expedition
1
, many specimens of varying composition have been found to contain leucite. The mineral occurs interstitially, is weakly birefringent with a high negative relief, and displays poorly denned lamellar and cross-hatched twinning. The refractive index, determined in sodium light by the immersion method, is 1.507 ± 0.003. Although similar to analcime in thin section, the refractive index is much higher (analcime,
n
= 1.487) even allowing for the possibility of desilication
2
or the substitution of potassium for sodium ions
3
. Identification of the mineral as leucite was confirmed by the Department of Mineralogy, British Museum (Natural History), with four X-ray powder photographs (Nos. 9652, 9845, 9846 and 9847) on material picked from three rock crushes. |
| doi_str_mv | 10.1038/198779a0 |
| format | Article |
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1
, many specimens of varying composition have been found to contain leucite. The mineral occurs interstitially, is weakly birefringent with a high negative relief, and displays poorly denned lamellar and cross-hatched twinning. The refractive index, determined in sodium light by the immersion method, is 1.507 ± 0.003. Although similar to analcime in thin section, the refractive index is much higher (analcime,
n
= 1.487) even allowing for the possibility of desilication
2
or the substitution of potassium for sodium ions
3
. Identification of the mineral as leucite was confirmed by the Department of Mineralogy, British Museum (Natural History), with four X-ray powder photographs (Nos. 9652, 9845, 9846 and 9847) on material picked from three rock crushes.</description><identifier>ISSN: 0028-0836</identifier><identifier>EISSN: 1476-4687</identifier><identifier>DOI: 10.1038/198779a0</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>Humanities and Social Sciences ; letter ; multidisciplinary ; Science ; Science (multidisciplinary)</subject><ispartof>Nature (London), 1963-01, Vol.198 (4882), p.779-780</ispartof><rights>Springer Nature Limited 1963</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a307t-7eb2b113945ebbdc189b6c7811c02d3ce801f607e1f403fdab6884d462d4c1a73</citedby><cites>FETCH-LOGICAL-a307t-7eb2b113945ebbdc189b6c7811c02d3ce801f607e1f403fdab6884d462d4c1a73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1038/198779a0$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1038/198779a0$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,2725,27923,27924,41487,42556,51318</link.rule.ids></links><search><creatorcontrib>LE MAITRE, R. W</creatorcontrib><creatorcontrib>GASS, I. G</creatorcontrib><title>Occurrence of Leucite in Volcanic Rocks from Tristan da Cunha</title><title>Nature (London)</title><addtitle>Nature</addtitle><description>DURING recent petrological research on volcanic rocks collected by the Royal Society Tristan da Cunha Expedition
1
, many specimens of varying composition have been found to contain leucite. The mineral occurs interstitially, is weakly birefringent with a high negative relief, and displays poorly denned lamellar and cross-hatched twinning. The refractive index, determined in sodium light by the immersion method, is 1.507 ± 0.003. Although similar to analcime in thin section, the refractive index is much higher (analcime,
n
= 1.487) even allowing for the possibility of desilication
2
or the substitution of potassium for sodium ions
3
. Identification of the mineral as leucite was confirmed by the Department of Mineralogy, British Museum (Natural History), with four X-ray powder photographs (Nos. 9652, 9845, 9846 and 9847) on material picked from three rock crushes.</description><subject>Humanities and Social Sciences</subject><subject>letter</subject><subject>multidisciplinary</subject><subject>Science</subject><subject>Science (multidisciplinary)</subject><issn>0028-0836</issn><issn>1476-4687</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1963</creationdate><recordtype>article</recordtype><recordid>eNptz09LwzAYBvAgCtYp-AkkRz1U37fJkvTgQcb8A4OBTK8lfZto55ZK0h789k7q8OLpufx4eB7GzhGuEYS5wdJoXVo4YBlKrXKpjD5kGUBhcjBCHbOTlNYAMEUtM3a7JBpidIEc7zxfuIHa3vE28NduQza0xJ87-kjcx27LV7FNvQ28sXw2hHd7yo683SR39psT9nI_X80e88Xy4Wl2t8itAN3n2tVFjShKOXV13RCaslakDSJB0QhyBtAr0A69BOEbWytjZCNV0UhCq8WEXY69FLuUovPVZ2y3Nn5VCNXP7Wp_e0evRpp2JLy5WK27IYbduv_sxWiD7Yfo_kr34BvMzGCC</recordid><startdate>19630101</startdate><enddate>19630101</enddate><creator>LE MAITRE, R. W</creator><creator>GASS, I. G</creator><general>Nature Publishing Group UK</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>19630101</creationdate><title>Occurrence of Leucite in Volcanic Rocks from Tristan da Cunha</title><author>LE MAITRE, R. W ; GASS, I. G</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a307t-7eb2b113945ebbdc189b6c7811c02d3ce801f607e1f403fdab6884d462d4c1a73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1963</creationdate><topic>Humanities and Social Sciences</topic><topic>letter</topic><topic>multidisciplinary</topic><topic>Science</topic><topic>Science (multidisciplinary)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>LE MAITRE, R. W</creatorcontrib><creatorcontrib>GASS, I. G</creatorcontrib><collection>CrossRef</collection><jtitle>Nature (London)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>LE MAITRE, R. W</au><au>GASS, I. G</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Occurrence of Leucite in Volcanic Rocks from Tristan da Cunha</atitle><jtitle>Nature (London)</jtitle><stitle>Nature</stitle><date>1963-01-01</date><risdate>1963</risdate><volume>198</volume><issue>4882</issue><spage>779</spage><epage>780</epage><pages>779-780</pages><issn>0028-0836</issn><eissn>1476-4687</eissn><abstract>DURING recent petrological research on volcanic rocks collected by the Royal Society Tristan da Cunha Expedition
1
, many specimens of varying composition have been found to contain leucite. The mineral occurs interstitially, is weakly birefringent with a high negative relief, and displays poorly denned lamellar and cross-hatched twinning. The refractive index, determined in sodium light by the immersion method, is 1.507 ± 0.003. Although similar to analcime in thin section, the refractive index is much higher (analcime,
n
= 1.487) even allowing for the possibility of desilication
2
or the substitution of potassium for sodium ions
3
. Identification of the mineral as leucite was confirmed by the Department of Mineralogy, British Museum (Natural History), with four X-ray powder photographs (Nos. 9652, 9845, 9846 and 9847) on material picked from three rock crushes.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><doi>10.1038/198779a0</doi><tpages>2</tpages></addata></record> |
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| title | Occurrence of Leucite in Volcanic Rocks from Tristan da Cunha |
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