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ZYGADITE. 



Zygadite, Breiiliaupt. Occurs in thin 

 tabular right rhombic prisms, and in twins 

 like Albite. Colour reddish or yellowish- 

 white. Feebly transparent or slightly trans- 

 lucent. Lustre vitreous, inclining to pearly 

 on the distinct cleavage-planes. H. below 6. 

 S.G. 2-511. 



ZYGADITE. 



Comp. Silica, alumina, and lithia, with- 

 out water. 



Locality. Katherina-Neufang Mine, near 

 Zellerfeld, in the Harz, with Quaitz and 

 Stilbite. 



Name. From Kvyah/,v, in pairs, in allusion 

 to the occurrence of the crystals in twins. 



LONDON 

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