204 DOMAIN X. TKANSILIENT. 



parent talc, sometimes undulated, at others 

 fibrous or laminar. 



A large rock of siderite, partly very hard, 

 and yielding sparks with steel ; partly laminar, 

 and more tender. The hard part marbled with 

 brown, from the decomposition of the iron. It 

 is crystallised. 



A massive garnet rock, either in mass or con- 

 fusedly crystallised with deep green siderite, in 

 brilliant needles, being a mixture of the greatest 

 beauty*. The infusibility of the garnet, Saus- 

 sure ascribes to the refractory matrix ; a remark 

 that may be applied in many other instances, 

 and chemists should often analyse the gangart. 



Another rock of siderite, brown where com- 

 posed of flat plates, green when of little needles, 

 confusedly interlaced. His greenish schistus, of 

 a fine pierre de corne, seems a chlorite slate. 



The calcareous granitoid of limestone, quartz, 

 and mica, alternates repeatedly at Mont Jovet 

 with the other rocks; and Saussure observed 

 another kind, consisting of rhomboidal calcareous 

 spar of a fawn-colour, of a pure white quartz, 

 and white talc, in soft brilliant plates; a most 

 beautiful and uncommon rockf. 



* Some fragments are of pure red. 

 f Sauss. 960, 



