There is a typo in the formula: instead of (OH)2 it should be (OH)4 http://www.mindat.org/forum.php?read,104,236514,236514#msg-236514 Sun, 19 May 2013 10:43:01 +0000 Phorum 5.2.15a http://www.mindat.org/forum.php?read,104,236514,236524#msg-236524 http://www.mindat.org/forum.php?read,104,236514,236524#msg-236524 Rob Woodside Minerals Wed, 28 Sep 2011 20:30:42 +0000 http://www.mindat.org/forum.php?read,104,236514,236514#msg-236514 http://www.mindat.org/forum.php?read,104,236514,236514#msg-236514 Erik Vercammen Minerals Wed, 28 Sep 2011 18:09:29 +0000