Keilhauite (also known as "yttrotitanite") is a
It differs from titanite only in that calcium is substituted by up to 12 percent (Y,Ce)2O3.
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Keilhauite — Keil hau*ite (k[imac]l hou*[imac]t), n. (Min.) A mineral of a brownish black color, related to titanite in form. It consists chiefly of silica, titanium dioxide, lime, and yttria. [1913 Webster] … The Collaborative International Dictionary of English
keilhauite — noun yttrotitanite … Wiktionary
keilhauite — … Useful english dictionary
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