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Blairmorite : ウィキペディア英語版
Blairmorite

Blairmorite is a rare porphyritic volcanic rock characterized by dominant analcime phenocrysts in a matrix of analcime, sanidine and alkalic pyroxene with accessory titanite, melanite and nepheline. It was named after the community of Blairmore in southwestern Alberta, Canada.〔Johannsen, A. 1933. A descriptive petrography of the igneous rocks, Appendix III, p. 244. Univ. of Chicago Press.〕
This extrusive igneous rock is known from only two geological formations worldwide. The foremost blairmorite occurrence is the Crowsnest Formation in the Canadian province of Alberta where it is associated with agglomerates and tuffs from explosive eruptions. The other locality is the Lupata Gorge in Mozambique.〔
==References==



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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