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Combeite
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Combeite : ウィキペディア英語版
Combeite

Combeite is a rare silicate mineral with the formula Na2Ca2Si3O9. It has a trigonal crystal system.
==Discovery and occurrence==
It was first described in 1957 for an occurrence in nephelinite lavas and tephra on Mt. Nyiragongo, Goma, Kivu, Democratic Republic of Congo (then Zaïre).〔(Combeite on Mindat.org )〕 It has also been reported from the Bellerberg volcano in Ettringen, Germany and the Oldoinyo Lengai volcano, Tanzania.〔 It was named for Arthur Delmar Combe of the Geological Survey of Uganda.〔(Combeite data from Webmineral )〕〔(Handbook of Mineralogy )〕
It is associated with götzenite at Mt. Shaheru, Congo; and with wollastonite, clinopyroxene, nepheline, melilite, titanian garnet and titanian magnetite at Oldoinyo Lengai.〔

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