Tinaksite (chemical formula K2Na(Ca,Mn2+)2TiO[Si7O18(OH)])[3] is a mineral found in northern Russia.

Tinaksite can be grayish-white, yellowish, orange, or brown,[2] and it is often found in charoite.

[5] Its name is derived from its composition: titanium (Ti), sodium (Na) potassium (K) and silicon (Si).

The International Mineralogical Association first recognized tinaksite as a mineral in 1965.