  Hemimorphite.  
Description from the source: 
Hemimorphite (Zn4 Si2 O7 (OH)2 x H2 O orth.), Ojuela Mine, Mapimi`, Durango, Mexico. Transparent, perfect crystals on limonitic matrix. 4,5x3x2 cm; 22 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 30 September, 2008 
Text Updated: 1 October, 2008 
Price: Trade 
Size: 1.75" 
Composition: Zn4Si2O7(OH)2.H2O
 |  
  |  
 |  
  |