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・ Parsons, Shepherd, and Damon Houses Historic District
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・ Parsonsfield Seminary
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・ Parsonsia capsularis
・ Parsonsia heterophylla
・ Parsonsia howeana
・ Parsonsia straminea
・ Parsonsia velutina
Parsonsite
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Parsonsite : ウィキペディア英語版
Parsonsite

Parsonsite is a lead uranium phosphate mineral with chemical formula: Pb2(UO2)(PO4)2·2H2O. Parsonsite contains about 45% lead and 25% uranium. It forms elongated lathlike monoclinic crystals, radial spherulites, encrustations and powdery aggregates. It is of a light yellow colour. It has a Mohs hardness of 2.5-3 and a specific gravity of 5.72 - 6.29.〔(Webmineral data for parsonite )〕〔(Handbook of Mineralogy )〕
It was first described in 1923 for an occurrence in the Shinkolobwe Mine, Katanga Copper Crescent, Democratic Republic of Congo. It was named for mineralogist Arthur Leonard Parsons (1873–1957) of the University of Toronto, Canada.〔〔(Parsonite on Mindat.org )〕
==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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