



136 Outlines of the Mineralogy and Geology 



t; Yield a greenhh or blackish grey enamel 



SPECIES 



Subspecies 



XTIII. 



/ 



Var. 2. JS'ovacuUte. Grevish, greenish ; splintery fracture. 



XIV. in, -^Jdynolite, Grey, green; diverging fibrous; 



foliated ; crystallized in imperfect six-sided 

 prisms. 



■^ 



tit Vield a yellowish glass or enameL 



X. — Prehnite. Green, white ; glistening ; pearly ; fusi- 

 ble into a yellowish frothy glass. 



t It j Field a black or dark green glass or enameL 



IK»'—Epidote, Green, amorphous and in acicular crystals ; 



fracture splintery, uneven and fascicular diverging, 

 XIV. i.'^Common Hornblende. Greenish, blackish ; 



tough ; foliated. 



VI. — Basalt. Greyish black ; dull ; faintly glimmering ; 



brittle. 



§ Yield easily to the knife and sometimes to the naiL 



t Yield a white glass or enameL 



III. — Mica^ Perfectly lamellar in one direction ; lameV 



!» elastick. 



tl Yield a dark brownish enameL 



VII,— 'TTacJ^e. Greenish, greyish; amorphous; cellular. 



XVIIL 



w 



Var. 1 . Jrgilliie* Slaty ; glimmering; fragments tabular and 



rhomboidal. 



