viii M. Brongniaut's Table 



Species 2. PROTOGINE. (Jurine.) 



Essentially composed of felspar, quartz, and steatite, talc, 

 or chlorite, entirely or almost entirely replacing the mica. 



Observation. The decomposing (alter^es) syenites are easily confounded 

 with this rock. 



(Tlie Pomenaz, valley of Servos, — the Talefre, — the Gorge of Malla- 

 vale in Oisans, — the Sonnenberg in the Hartz, — Niolo in Corsica.) 



Species 3. PEGMATITE. (//a%.) Graphic granite, kc. 



Essentially composed of lamellar felspar and quartz. 



Obs. All the fine kaolins are derived from this rock. 

 (St. Yriex, near Limoges, — Geyer, — Cambo, near Bayonne, — Long- 

 crup, near Bagneres) 



Species 4. MIMOSE. (A species establihed by M. Hauy.) 



Essentially composed of augite and lamellar felspar. 

 (Summit of the Meissner.) 



Genus 2. HORNBLENDE ROCKS. 

 Char. Hornblende is the essentially constituent part. 



Species 1. SYENITE. (Werner.) 



Essentially composed of lamellar felspar, hornblende, and 

 quartz. The felspar is often predominant. 



Principal varieties. 



Granitic S Felspar and lamellar hornblende with a little 



mica. 

 (Upper Egypt, — Plauen in Saxony, — the 



Rehberg in the Hartz.) 

 Schistose S Lamellar felspar and hornblende with a slaty 



structure. 

 PoRPHTRiTic S Large felspar crystals in a small grained 



syenite. (Alteuberg in Saxony.) 

 Zircon S Felspar, lamellar hornblende, and zircon. 



(Fridrichwern in Norway.) 



