C ] 



q q. Lapis Lazuli, is opaque, comparand never 

 found cryftallized ; amorphous, feldom pure; of 

 a fky-blue colour, which it retains in the fire for 

 a long time, but at length becomes brown. Anal. 

 Silex, lime, fulphate of lime, and iron. Margraff. 



r r. Prehnite, fo called by Werner, after Capt. 

 Prehn, who brought it firft to Europe from the 

 Cape in 1783. Cryftallized in tetrahedral prifms; 

 indeterminate ; amorphous, foliated ; femi-tranf- 

 parent and brittle ; furface mining, with a lamel- 

 lated, or fibrous texture ; of a greenifh grey co- 

 lour. Anal, Silex 44. Argill 30. Lime 18. 

 Iron 5. Water and air 2. Klaproth. 



f f. Adelite, of particular fhapes, tuberous. 

 Anal. Silex 62 to 69. Argill 18 to 20. Lime 

 8 to 16. Water 3 to 4. Bergman. 



1 1. Zeolite, opaque, feldom femi-tranfparent ; 

 hard, but rarely fo hard as to ftrike fire with 

 fteel ; of a pale green, filver white and honey co- 

 lour, fometimes of a bluifh or coppery hue ; cryftal- 

 lized in cubes ; it is found compact, fibrous, radi- 

 ated, lamellated, uniform, ftala&ical, in drops, 

 and of a capillary fhape, in which it is very beau- 

 tiful ; in fix-fided and flat prifms. Anal. Silex 

 50. Argill 20. Lime 8. Water 22. Pelletier. 



uu. Siliceous Spar, cryftallized in tetrahedral, 

 and in hexahedral prifms. Anal. Silex 61,1. 

 Lime 21,7. Argill 6,6. Magnefia 5. Oxyde of 

 iron 1,3, Water 33, Bindheim. 



v v. Rose 



1 



