Keilhauite

Keilhauite (also known as yttrotitanite) is a variety of the mineral titanite of a brownish black color, related to titanite in form. It consists chiefly of silicon dioxide, titanium dioxide, calcium oxide, and yttrium oxide.

Keilhauite has a chemical formula of (CaTi,Al₂,Fe₂³⁺,Y₂³⁺)SiO₅. It differs from titanite only in that calcium is substituted by up to 12 percent (Y,Ce)₂O₃.

References

Mindat

Titanium minerals

Oxide minerals

Simple	Anatase Brookite Geikielite Rutile

Mixed	Aeschynite-(Y) Armalcolite Betafite Euxenite Freudenbergite Haggertyite Ilmenite Keilhauite Latrappite Perovskite Polycrase Zimbabweite Zirconolite Zirkelite

Silicate minerals

Aenigmatite
Keilhauite
Lorenzenite
Melanite
Nenadkevichite
Titanite
Zircophyllite

Other

Sabinaite (carbonate mineral)
Warwickite (borate mineral)

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