andesine

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A white, gray, green, or yellow variety of plagioclase feldspar that contains approximately equal proportions of sodium and calcium and occurs in igneous rocks of intermediate silica content, such as andesite and diorite.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Min.) A kind of triclinic feldspar found in the Andes.

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

• noun mineralogy Sodium calcium aluminum silicate, (), a plagioclase feldspar, the third member of the albite-anorthite solid solution series. Found in fine-grained andesite lavas; crystals are rarely seen.