of Mixed Rocks. ix 



Species 2. DIABASE. (Grunstein, Werner.) 



Essentially composed of hornbleade and compact felspar 

 nearly equally disseminated. 



Principal varieties. 



Granitic D The structure granular. 



(The diabase of the ancient Egyptian monu- 

 ments ; it contains black mica. La Perque, 

 opposite Coutance, &c.) 



ScHliTOSE D The structure fissile, rajed, or zoned. 



(Charbiac, near Saint-Flour. The Chalan- 

 ches in Oisaiis, — the Schneeberg.) 



PoRPHTRiTic D Crystals of compact felspar disseminated in 



a fine grained greenstone. 



Oreicdlar D Spheres with concentric zones of hornblende 



and compact felspar in a diabase of mode- 

 rately sized grains. 

 (Orbicular granite of Corsica.) 



Species 3. HEMITIIRENE. 



Essentially composed of hornblende and limestone. 



(The rock named primitive greenstone witii limestone of 

 Andreasberg, in the Hartz, — of Smalzgrube in Saxony. The 

 rock named limestone of Maresberg in Saxony.) 



Class II. THE CRYSTALLIZED ANISO- 

 MEROUS (ANISOMERES) ROCKS. 



Char. Wholly or in pjTrt formed by confused crys- 

 tallization ; one predoniinant part serving as a base, 

 paste or cement to the others, and contemporaneous, 

 or anterior to the parts it contains. 



Genus L WITH A BASE OF CRYSTALLIZED 



QUAllTZ. 

 Species 1. IIYALOMICTE. (Graisen.) 



Essentially composed of crystallized qnartz, with mica dis- 

 seminated but not continuous. The structure granular. 



(Altemberg, with tin, — Vaulry, near Limoges, with wol- 

 fram.) 



l> % 



