09 



TAB. CLVII. 



SILEX Quartzum ; var. Jaspis. 

 Quartz- Jasper. 



Class 2. Earths. Order 1, Homogeneous, 

 Gen. 4. Silex. . Spec. 1. Pure. 



Div. 3. Amorphous. 



Syn. Quartz- Jaspe. Hauy, 2. 435. 



Gemeiner Jaspis. Emmerl. 1. 243. 

 Jasper. Kirw. 1. 309. 



Some Jasper has the appearance of a ribband, and is called 

 Ribband or Band Jasper. Either term is intelligible, and 

 may answer the purpose well enough as to this part of the 

 character, although it may with much propriety be called 

 Stratified. Jasper is nearly allied to flint approaching 

 hornstone, having rather a horny appearance. It is an im- 

 pure amorphous Quartz, somewhat altered by a mixture of 

 Argilla*. Its fracture is smooth, conchoidal or bluntish, 



Porcelain Jasper is said to contain: 





Silica . . . . 



60-75 



Argilla . . . 



27-25 



Magnesia . . 



3-00 



Oxide of Iron . 



2-50 



Potash . . . 



3-66 



95-216 



