34 PHYSIOGRAPHY. 



Mellite. 



Cleavage, parallel with P very difficult. Fracture con- 

 choidal. Surface of the truncated summits rough anc 

 curved ; of the planes on the pyramidal edges rough ; the 

 rest of the planes smooth and shining. 



Lustre resinous, inclining to vitreous. Color honey- 

 yellow, inclining often to red and brown. Streak white 

 Transparent . . . translucent. 



Sectile. Hardness =2-0 .. .2-5. Sp. gr. =1-597. 



Compound Varieties. Small massive nodules : compo- 

 sition granular. 



4 



1. It loses color and transparency, when exposed to the flame of z 

 candle, and is soluble in nitric acid. 



2. Analysis. 



By KiLAPROTH. ByWoHLER. 



Alumina - - 16-00 - 41-4 



Mellitic acid - - 46-00 - - - 14-5 

 Water - - 33-00 - - - 44-1 



3. It is found only at Artern in Thuringia, where it exists in a bed oi 

 brown coal, sometimes attended by Sulphur. 



MENACCANITE. (See Iserine.) 

 MENGITE. 



Primary form. Right rhombic prism. M on M = 136 20'. 



Secondary form. Primary, with the terminal edges replaced 

 by single planes, inclining to the lateral planes under angles oi 

 140 30', 



Cleavage, parallel with the secondary planes in traces. Frac- 

 ture conchoidal, to uneven. 



Color black. 



Hardness. Scratches glass. Sp. gr. = 5-43. 

 It is found in Siberia. 



MENILITE. (See Opal.) 

 MESOLE. (See Mesotype.) 

 MESOLITE. (See Mesotype.) 



