from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A brownish to black mineral, chiefly (FeMg)2Al9Si4O23(OH), often having crossed intergrown crystals and sometimes used as a gem.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A dark brown nesosilicate mineral that has crystals that cross and intergrow
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. A 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.
Greek stauros, cross; see stā- in Indo-European roots + -lite.(American Heritage® Dictionary of the English Language, Fourth Edition)