PHYSIOGRAPHY. 31 



Margarite Mascagnine. 



reous upon the other faces. Color pale pearl-grey, passing 

 into red dish- white and yellowish-white. Streak white. 

 Tranuslucent. 



Rather brittle. Hardness = 3-5 . . .4-5. Sp. gr. = 

 3-032. 



Compound Varieties. Massive : composition granu- 

 lar, individuals of various sizes, faces of composition sel- 

 dom observable, rough, sometimes smooth. 



1. Analysis. 

 By Du MEXIL. 



Silica 3700 



Alumina .-..-.. 40-50 



Oxide of iron 4*50 



I Lime 8-96 



Soda 1-24 



Water 1-00 



2. Mar-gasite has been found in a bed in primitive rocks, mixed with, 

 and engaged in, the variety of Talc called foliated chlorite, at Sterzing 

 in the Tyrol, where it is accompanied by foliated Fluor, and Crichtonite. 



MAR&TATITE. 



A Blende from Marmato, which is black, and possessed of 

 a lamellar structure ; and contains, according to BOUSSIN- 



GAULT, 



Sulphnretofzinc - - 77-5 - - 76-8 

 Proto-sulphuret of iron - 22-5 - - 23-2 



MARMOLITE. (See Kerolite.) 



MARTITE. 



A variety of Octahedral Iron, which contains no protoxide of 



iron. 



MASCAGNINE. Volatile Bitter-Salt. 

 Stalaclitic. Massive : pulverulent. 

 Color yellowish-grey, white. Semi-transparent. 

 Taste bitter. 



