MEGAKALSILITE, A NEW POLYMORPH OF KAlSiO4 FROM THE KHIBINA ALKALINE MASSIF, KOLA PENINSULA, RUSSIA: MINERAL DESCRIPTION AND CRYSTAL STRUCTURE
Megakalsilite, KAlSiO4, hexagonal, a 18.1111(8), c 8.4619(4) Å, V 2403.7(2) Å3, c:a = 0.4672, space group P63, Z = 24, R = 0.039 (for 3255 observed reflections collected with a four-circle X-ray diffractometer), is a new mineral species from Mount Koashva, Khibina alkaline massif, Kola Peninsula, Ru...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.547.1155 2023-05-15T17:04:56+02:00 MEGAKALSILITE, A NEW POLYMORPH OF KAlSiO4 FROM THE KHIBINA ALKALINE MASSIF, KOLA PENINSULA, RUSSIA: MINERAL DESCRIPTION AND CRYSTAL STRUCTURE Alexander P. Khomyakov Elena Sokolova Elena Bonaccorsi Stefano Merlino Marco Pasero The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.1155 http://rruff.info/doclib/cm/vol40/CM40_961.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.1155 http://rruff.info/doclib/cm/vol40/CM40_961.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://rruff.info/doclib/cm/vol40/CM40_961.pdf text ftciteseerx 2016-01-08T11:20:13Z Megakalsilite, KAlSiO4, hexagonal, a 18.1111(8), c 8.4619(4) Å, V 2403.7(2) Å3, c:a = 0.4672, space group P63, Z = 24, R = 0.039 (for 3255 observed reflections collected with a four-circle X-ray diffractometer), is a new mineral species from Mount Koashva, Khibina alkaline massif, Kola Peninsula, Russia. It is of pegmatitic origin. Associated minerals are K-feldspar, sodalite, cancrinite, natrolite, pectolite, aegirine, natrite, nacaphite, vitusite, fluorcaphite, belovite, umbite, lemmleinite-K, lomonosovite, lovozerite, phlogopite, sphalerite, and galena. The mineral was found in only one hand specimen of pegmatite rock as a corroded, irregularly shaped grain 2 3 mm across, intergrown with cancrinite, sodalite, and natrite. It is transparent, colorless with a white streak, a vitreous luster, and fluoresces pale whitish green under ultraviolet light. Megakalsilite has a Mohs hardness of 6, is brittle with a conchoidal fracture, and has no cleavage. Dmeas is 2.58(2) g/cm3, Dcalc is 2.62 g/cm3. Megakalsilite is uniaxial negative, non-pleochroic, 1.538(1), 1.531(1). The strongest five reflections in the X-ray powder-diffraction pattern [d in Å(I)(hkl)] are: 3.091(100)(222), 2.612(70)(060), 1.240(60)(4.10.1,066,583), 3.18(50)(141), and 1.674(50)(173). An electron-microprobe analysis gives: K2O 29.73, Na2O 0.02, FeO 0.04, Al2O3 32.38, SiO2 37.96, TiO2 0.01, sum 100.14 wt.%. The corresponding empirical formula is K0.997Na0.001Fe0.001Al1.003Si0.998O4 (based on O = 4), ideally KAlSiO4. The name megakalsilite is derived from the Greek (great) and kalsilite, in allusion to the fact that megakalsilite shares the same chemical formula with kalsilite, but its unit cell is 12 times larger than that of kalsilite. The crystal structure of megakalsilite, KAlSiO4, has been solved Text kola peninsula Unknown Koashva ENVELOPE(34.082,34.082,67.656,67.656) Kola Peninsula |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
Megakalsilite, KAlSiO4, hexagonal, a 18.1111(8), c 8.4619(4) Å, V 2403.7(2) Å3, c:a = 0.4672, space group P63, Z = 24, R = 0.039 (for 3255 observed reflections collected with a four-circle X-ray diffractometer), is a new mineral species from Mount Koashva, Khibina alkaline massif, Kola Peninsula, Russia. It is of pegmatitic origin. Associated minerals are K-feldspar, sodalite, cancrinite, natrolite, pectolite, aegirine, natrite, nacaphite, vitusite, fluorcaphite, belovite, umbite, lemmleinite-K, lomonosovite, lovozerite, phlogopite, sphalerite, and galena. The mineral was found in only one hand specimen of pegmatite rock as a corroded, irregularly shaped grain 2 3 mm across, intergrown with cancrinite, sodalite, and natrite. It is transparent, colorless with a white streak, a vitreous luster, and fluoresces pale whitish green under ultraviolet light. Megakalsilite has a Mohs hardness of 6, is brittle with a conchoidal fracture, and has no cleavage. Dmeas is 2.58(2) g/cm3, Dcalc is 2.62 g/cm3. Megakalsilite is uniaxial negative, non-pleochroic, 1.538(1), 1.531(1). The strongest five reflections in the X-ray powder-diffraction pattern [d in Å(I)(hkl)] are: 3.091(100)(222), 2.612(70)(060), 1.240(60)(4.10.1,066,583), 3.18(50)(141), and 1.674(50)(173). An electron-microprobe analysis gives: K2O 29.73, Na2O 0.02, FeO 0.04, Al2O3 32.38, SiO2 37.96, TiO2 0.01, sum 100.14 wt.%. The corresponding empirical formula is K0.997Na0.001Fe0.001Al1.003Si0.998O4 (based on O = 4), ideally KAlSiO4. The name megakalsilite is derived from the Greek (great) and kalsilite, in allusion to the fact that megakalsilite shares the same chemical formula with kalsilite, but its unit cell is 12 times larger than that of kalsilite. The crystal structure of megakalsilite, KAlSiO4, has been solved |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Alexander P. Khomyakov Elena Sokolova Elena Bonaccorsi Stefano Merlino Marco Pasero |
spellingShingle |
Alexander P. Khomyakov Elena Sokolova Elena Bonaccorsi Stefano Merlino Marco Pasero MEGAKALSILITE, A NEW POLYMORPH OF KAlSiO4 FROM THE KHIBINA ALKALINE MASSIF, KOLA PENINSULA, RUSSIA: MINERAL DESCRIPTION AND CRYSTAL STRUCTURE |
author_facet |
Alexander P. Khomyakov Elena Sokolova Elena Bonaccorsi Stefano Merlino Marco Pasero |
author_sort |
Alexander P. Khomyakov |
title |
MEGAKALSILITE, A NEW POLYMORPH OF KAlSiO4 FROM THE KHIBINA ALKALINE MASSIF, KOLA PENINSULA, RUSSIA: MINERAL DESCRIPTION AND CRYSTAL STRUCTURE |
title_short |
MEGAKALSILITE, A NEW POLYMORPH OF KAlSiO4 FROM THE KHIBINA ALKALINE MASSIF, KOLA PENINSULA, RUSSIA: MINERAL DESCRIPTION AND CRYSTAL STRUCTURE |
title_full |
MEGAKALSILITE, A NEW POLYMORPH OF KAlSiO4 FROM THE KHIBINA ALKALINE MASSIF, KOLA PENINSULA, RUSSIA: MINERAL DESCRIPTION AND CRYSTAL STRUCTURE |
title_fullStr |
MEGAKALSILITE, A NEW POLYMORPH OF KAlSiO4 FROM THE KHIBINA ALKALINE MASSIF, KOLA PENINSULA, RUSSIA: MINERAL DESCRIPTION AND CRYSTAL STRUCTURE |
title_full_unstemmed |
MEGAKALSILITE, A NEW POLYMORPH OF KAlSiO4 FROM THE KHIBINA ALKALINE MASSIF, KOLA PENINSULA, RUSSIA: MINERAL DESCRIPTION AND CRYSTAL STRUCTURE |
title_sort |
megakalsilite, a new polymorph of kalsio4 from the khibina alkaline massif, kola peninsula, russia: mineral description and crystal structure |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.1155 http://rruff.info/doclib/cm/vol40/CM40_961.pdf |
long_lat |
ENVELOPE(34.082,34.082,67.656,67.656) |
geographic |
Koashva Kola Peninsula |
geographic_facet |
Koashva Kola Peninsula |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_source |
http://rruff.info/doclib/cm/vol40/CM40_961.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.1155 http://rruff.info/doclib/cm/vol40/CM40_961.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766059290799374336 |