xii M. Buongniart's Table 



by calcareous veins. The schist and limestone alternate in 

 this rock in the same manner as the quartz and mica alternate 

 in mica schist, the felspar and mica in gneiss, &c. I shall 

 cite as examples of this rock : the veined calschiste of la Ma- 

 deleine, near Moutier, which is micaceous, and its structure 

 fissile, alternating, and fibrous ; and those which I have ob- 

 served at Mont Aveutin, valley of the Arboust : at Lauder- 

 ville, valley of Louron : and at the Pic d'Eredlitz, in the 

 Pyrenees. They are blackish grey, micaceous, satiny, veined, 

 and with a reticulated amygdaloidal structure, &c. 



Genus 4. WITH A BASE OF TALC. 



Species 1. STEASCHIST. (Talkschiefer, Werner.) 



A talcose base containing disseminated mica or other mi- 

 nerals. The structure slaty. 



Principal varieties. 



Rough S. (Verharterertalc.) Generally brilliant, rough to the touch, 

 mixed with petrosilex in laminae, mica, 

 disseminated pyrites, &c. 

 (Pesey, in the department of Mont Blanc.) 



PoRPHTRlTic S Disseminated nodules or crystals of lamellar 



felspar 

 (Vereix, in the valley of Aosta.) 



Nodular S Enveloped shapeless nodules of crystalline 



quartz, felspar, &c. 

 (The harbour at Cherbourg. Mont Jovet, 

 department of the Doire.) 



Steatitic S Soft, very unctuous to the touch. 



(The stone of Baram, - St. Bel, near Lyon, — 

 Dax.) 



Chlorite S Soft, green, mixed with chlorite. 



(Corsica, with octohedral crystals of oxidu- 

 lated iron. Cauteret.) 



DrALLAGE S Green or brown, mixed witli diallage. 



Ophioline S Mixed with serpentine. (Corsica.) 



Phylladien S Talc and phyllade, very fissile. 



(The gangue of tlie Valorsine conglomerates.)^ 



