122 MINERALS. 



DIVISION 4. 

 Section 3 -Silicates, continued. 



3d Series, - Monoxide and Sesqni-oxide bases. 



I.encite on Lava. V< surius, Italy, 



crystals, loose. Fosso del Tavolato, near Rome. 

 Pollucite or "Pollux", in tube along with "Castor". Elba. 

 Crystals of Leucite & Idrocrase or Vesuvianite' Monte Somma. 

 Orthoclase, - common Feldspar. Baveno, Italy, 

 Campo, Elba. 



with Quartz, &c. St. Ilan'o, Elba. 



with Albite, Garnets & Quartz. St. Pivro, Elba. 



with Lepidolite. St. llario, Elba. 



with Albite, Quartz, Tourmaline, &c. St, llario. 



Decomposed Feldspar. ? Cornwall. 

 Galactite. Kilmacolm, Scotland. 



in matrix. 

 Analcite. Old Kilpatrivk, Scotland. 



Stye 



Microcline, anorthic Potash Feldspar. 

 Hyalophane. Binn, Siritzerland. 

 Plagioclase. or triclinic Feldspar. St. Piero, Elba. 



crystals in volcanic rock. 

 Albite. or Soda Feldsqar. Campo, Elba, 

 ,, ,, Binn, Switzerland. 



with Quartz. 



with Adularia. 



with Quartz and Tourmaline. St. Piero, Elbi\. 



Labradorite, a Lime-soda Feldspar. Labrador. 



