54 



744. SELEKITE. 



745. 



746. 



747. 



748. FIBROUS GYPSUM. 



mm^n 



749. 

 750. 



751. 



752. GYPSUM. 



753. ALABASTER 



754. 



755. 



756. EPSOMITE. 



fe m S 



757. GOSLARITE. 



Cianciana, Sicily. 

 Grand Rapids, Michigan. 

 Nottingh amshire . 

 Switzerland. 



m * 



Cumberland, England. 



n ^ m 



Mammoth Cave, Kentucky. 



iL /p^ 



Iowa. 



Eisleben, Saxony. 



Fries, France. 



n B 



Switzerland. 



m m 



Stassfiirt, Saxony. 

 Goslar, the Harz. 



