[ 125 ] 



and their varieties; tranfparent ; mining lamella?, 

 placed one over the other, often in an irregular 

 manner ; but it's figure approaches always either 

 to the cubical or rhomboidal. Anal. Silex 62. 

 Argill 17. Lime 6,5. Barofelenite 2. Mag- 

 nena 6. Iron 1,4. JVestrumb. 



m m. Common Fellspar, of a pale flefh colour, 

 yellowifh, grey, milk white ; rarely of a vivid 

 green or bluifh colour ; opaque, compact, ftrikes 

 fire with fteel. Anal. Silex, argill, with lime 

 and magnefia, or baryte. Kirwan. Silex 62,83. 

 Alumine 17,002. Lime 3. Oxyde of iron 1. 

 Lofs. 16,015. Vauquelin. 



n n. Labrador Feltspar, amorphous, foliated, 

 of various hues, light or deep grey, but when held 

 in certain directions to the light, reflects lazuli 

 blue, green, and lemon yellow, coppery or violet 

 colour, the furface fliining, texture foliated, frag- 

 ments rhomboidal. Anal. Silex 69. Argill 13. 

 Sulphate of lime 12, Oxyde of copper 0,7. Ox- 

 yde of iron 0,04. Bindheim. 



00. Argentine Feltspar, cryftallized, as com- 

 mon feltfpar ; amorphous, foliated. Anal. Silex 

 46. Argill 36. Oxyde of iron 16. Dodun. 



p p. Staurolite, cryftallized in tetrahedral 

 prifms, with tetrahedral pyramids, either (ingle, or 

 crofting each other at right angles. Anal. Sile* 

 44. Argill 20. Baryte 20. Water 16. Wes- 

 trumb. v 



q q. Lapis 



V 



