hat
Hibonit ((Ca, Ce) (Al, Ti, Mg) 12O19) se yon mineral nwa marin ak yon dite nan 7.5-8.0 ak yon estrikti kristal ègzagonal. Li se ra, men yo jwenn nan wo-klas metamòfik wòch sou Madagascar. Gen kèk grenn presilèr nan meteyorit primitif ki konpoze de hibonit. Hibonite tou se yon mineral ki komen nan Ca-Al-rich enklizyon yo (CAIs) yo te jwenn nan kèk meteyorit chondritik. Hibonit se pwòch relatif ak hibonite-Fe (IMA 2009-027, ((Fe, Mg) Al12O19)) yon mineral chanjman nan Meteorite Allende la.
eng
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.