Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
Mathiesen (1970) discuss a complex Ti mineral, and suugest relationship or identification as davidite, but data is not confirmative. Found in a small area of a chert-like light grey to red felsic rock.