MINERALS. 123 



DIVISION 4. 

 Section 3 -Silicates, continued. 



3d Scrie. , - Monoxide and Sesqui-oxide bases. 



Adularia, a potasium silicate. Bian, Switzerland. 

 with Mica and Rutile. 



and Albite with Chlorite. Binn, Switzerland. 



with Quartz. 



with Chlorite. 



and Lepidolite. St. Piero, Elba. 



Moonstone, soda-lime Feldspar. Ceylon. 

 Moonstones, rough. 



cut. 



Meionite, a true unisilicate. Monte Somma, Italy. 

 Beryls, with smoky Quartz. St. Piero, Elba. 



in tube. 



Aquamarine, in feldspathic matrix. Catnpo, Elba. 

 Prehnite. Old Kilpairick, Scotland. 

 ,. Erskine, 



Kilmalcolm. 



Natrolite, or Needlestone. Kilmakolm. 

 Skye, Scotland. 



Bor Ghat, India.. 



Kimberley, S. Africa. 



on Basalt. Scogli Ciclopi, Sicily, 



Analcime on Basalt 



Aci-Castello, Sicily. 



Laumonite. Old Kilpatrick. 

 Kilmalcolm. 



