Wiktionary
altisite
n. (context mineral English) A monoclinic-prismatic white mineral containing aluminum, chlorine, oxygen, potassium, silicon, sodium, and titanium.
Wikipedia
Altisite
Altisite is an exceedingly rare alkaline titanium aluminosilicate chloride mineral with formula NaKTiAlSiOCl, from alkaline pegmatites. Its named after its composition (ALuminium, TItanium, and SIlicium).