wattevilleite

wattevilleite

[′wät·vi‚līt]
(mineralogy)
Na2Ca(SO4)2·4H2O A snow white mineral consisting of a hydrated sulfate of sodium and calcium; occurs as aggregates of acicular or hairlike crystals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.