• (a.) Of or pertaining to staurolite; resembling or containing staurolite.
Stau`ro·lit'ic adjective (Min.) Of or pertaining to staurolite; resembling or containing staurolite. 
staurolite, staurolitic Literally, 'cross-stone'; a reddish-brown or black mineral of iron and magnesium that occurs as prismatic crystals in metamorphic rocks, often in a cross shape. It is used as a gemstone that often forms twin crystals in the shape of a cross. The term metamorphism refers to a change in the physical structure of rock that resu...