tainiolite

from The Century Dictionary.

• noun A kind of lithium-mica occurring in colorless crystals having the form of strips or bands: its relations to the better-known species have not been determined: found in southern Greenland.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mineralogy A monoclinic-prismatic mineral containing fluorine, lithium, magnesium, oxygen, potassium, and silicon.