54 PHYSIOGRAPHY. 



Monazite Mullerite. 



Streak flesh-red. 



Hardness =5-00. Sp. gr. =4-924. 



1. Heated to redness in a glass tube, it suffers no change. In the 

 strongest heat of the blow-pipe, it only melts upon the edges, where it 

 turns to a greenish yellow. Treated with soda or borax, in the reduction 

 flame, it dissolves with effervescence into a light, yellowish, opake mass. 

 Dissolved in the salt of phosphorus, the globule is yellow, while warm; 

 but on cooling becomes yellowish green, and opake. From these and 

 other experiments, it has been inferred that the Monazite is a compound 

 of the oxide of uranium with some one or more of the earths. 

 2. It is found in the mountains about Ilmensjon in Siberia. 



MONOPHANE. 



Primary form. Right rhombic prism. M on M = 134 46'. 



Secondary form, the primary having the obtuse angles replaced 

 by singles planes, t on t (fig. 171) = 111 56'. 



Cleavage perfect, parallel with the shorter diagonal. 



Lustre pearly on the cleavage planes, vitreous ou the others. 

 Color white. 



Hardness (scale of BREITHAUPT) = 6-50 . . . 7-50. Sp. gr. = 

 2-158... 2 177. 



1. Its locality is not mentioned. 



MONTI CELLITE. 



Primary form. Right rhombic prism. M on M = 132 34'. 

 Cleavage not observable. 



Lustre vitreous. Color yellowish, to colorless. Transparent. 

 Hardness = 5-0.. .7-0. 



1. It becomes gelatinous in muriatic acid, and is difficult to fuse be- 

 fore the blow-pipe. 



2. It is found with Mica and Pyroxene, in limestone, among the 

 ejected matters of Vesuvius. 



MOROXITE. (See Apatite.) 



MULLERITE. Auro-tellurium Melacone- 



Metal. 



Primary form. Right rhombic prism. M on M=105 

 30'. 



