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Tinaksite (K2Na(Ca,Mn2+)2Ti[O|Si7O18(OH)])[2] is a mineral found in northern Russia. Tinaksite can be grayish-white, yellowish, orange, or brown,[1] and it is often found in charoite.[4] Its name is derived from its composition: titanium (Ti), sodium (Na) potassium (K) and silicon (Si). International Mineralogical Association first recognized tinaksite as a mineral in 1965.

References
http://webmineral.com/data/Tinaksite....
http://www.mindat.org/min-3966.html
Mineralienatlas
http://www.galleries.com/minerals/sil...
External links
Rozhdestvenskaya, I. V.; Nikishova, L. V.; Lazebnik, Y. D.; Lazebnik, K. A. (1989). "The crystal structure of tokkoite and its relation to the structure of tinaksite" (PDF). Zeitschrift für Kristallographie: 195–204. doi:10.1524/zkri.1989.189.14.195.