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hibonite : ウィキペディア英語版
hibonite

Hibonite ((Ca,Ce)(Al,Ti,Mg)12O19) is a brownish black mineral with a hardness of 7.5-8.0 and a hexagonal crystal structure. It is rare, but is found in high-grade metamorphic rocks on Madagascar. Some presolar grains in primitive meteorites consist of hibonite. Hibonite also is a common mineral in the Ca-Al-rich inclusions (CAIs) found in some chondritic meteorites. Hibonite is closely related to hibonite-Fe (IMA 2009-027, ((Fe,Mg)Al12O19)) an alteration mineral from the Allende meteorite.〔(IMA Mineral List with Database of Mineral Properties )〕
A very rare gem, Hibonite was discovered in Madagascar by Paul Hibon, a French prospector.〔http://www.gemdat.org/gem-1897.html〕
==See also==

* Glossary of meteoritics

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「hibonite」の詳細全文を読む



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