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Marialite : ウィキペディア英語版
Marialite

Marialite is a silicate mineral with a chemical composition of Na4Al3Si9O24Cl〔〔 if a pure endmember or Na4(AlSi3O8)3(Cl2,CO3,SO4) with increasing meionite content.〔 Marialite is a member of the scapolite group and a solid solution exists between marialite and meionite, the calcium endmember.〔 It is a rare mineral usually used as a collector's stone. It has a very rare but attractive gemstones and cat's eye.〔http://www.galleries.com/minerals/silicate/scapolit/scapolit.htm〕
==Crystallography==
Marialite has tetragonal crystallography and a 4/m crystal class. It has a 4 fold rotation with 90° mirror planes. Crystals are usually prismatic with prominent forms of prisms and dipyramids.〔Johnsen, O. (2000) Photographic Guide to Minerals of the World. 439 p. Oxford University Press, Great Clarendon Street, Oxford〕
Marialite belongs to an uniaxial negative optical class which means it has one circular section and a principal section shaped like an oblate sphenoid.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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