Encyclopaedia of minerals, crystals, rocks & ores :  identification, extraction and processing / 
by Eddie Rodrignez, editor. 
 - USA :  Nyx Academics LLC,  2012. 
 - 5 v. :  ill. ;  24 cm. 
<br/><br/>Includes index and bibliography : p. 259-262. 
<br/><br/><label>ISBN: </label>9781621581208 (set)  RM2335.31 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Minerals--Encyclopaedia.<br/>Rocks--Encyclopaedia.<br/>Crystals--Encyclopaedia.<br/>Ores--Encyclopaedia.