nStaurolite(Min) A mineral of a brown to black color occurring in prismatic crystals, often twinned so as to form groups resembling a cross. It is a silicate of alumina and iron, and is generally found imbedded in mica schist. Called also granatite, and grenatite.
Century Dictionary and Cyclopedia
nstauroliteA silicate of aluminium and iron occurring in reddish- to yellowish-brown or brownish-black prismatic crystals. These crystals are often twins, in the form of a cross, whence it is called cross-stone. Also staurotide, qrenatite.
Chambers's Twentieth Century Dictionary
nStaurolitestawr′ō-līt a silicate of alumina with ferrous oxide, magnesia, and water, crystallising in trimetric forms, common as twinned cruciform crystals in certain states
Webster's Revised Unabridged Dictionary
Gr. stayro`s a cross + -lite,
Kyanite and staurolite may also be mentioned as occasionally occurring.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2" by Various