fermorite

fermorite

[′fər·mə‚rīt]
(mineralogy)
(Ca,Sr)5[(As,P)O4]3 A white mineral composed of arsenate, phosphate, and fluoride of calcium and strontium, occurring in crystalline masses.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.