DETERMINATION OF MINERALS. 403 



natrolite, but twinned, with converging striae on i-i as in figure on 

 p. 299; B.B. sometimes curls up, fuses very easily. 



G-^IELINITS, p. 301. H. =45 ; G. =2-22 ; in small and short hex- 

 agonal or rhombohedral cryst. ; B.B. fuses easiiv. 



PfalLIFPSITE, p. 302. H.= 4-4 '5 ; G. =2 *2 ; in twinned crystals ; 

 B.B. fuses rather easily. 



LAUMONTITE, p. 293. H. =3 *5-4 ; G. =2*2-2*4 ; white, reddish ; 

 crystals become white and crumbling on exposure to the air ; B.B. 

 fuses rather easily. 



Pectolite (p. 293;, and Analcite (p. 299), imperfectly gelatinize. 



h. Hydrous ; fuse with much difficulty. 



CALAMINE, p. 157. H. =4*5-5 ; G.=315-319 ; white, greenish, 

 bluish ; orthorhombic in crystals ; B.B. fus. with great difficulty, re- 

 action for zinc and none for iron ; hydrous. 



SEPIOLITE, p. 306. White ; soft and almost clay-like, also fibrous ; 

 B.B. fuses with difficulty, with cobalt solution reddish ; hydrous. 



PYROSCLERITE, p. 317. H.=3 ; G.=2*74; micaceous ; B.B. fuses 

 on thin edges. 



c. Anhydrous. 

 a NO REACTION FOR SULPHUR ; NO COATING ON COAL. 



NEPHELITE. p. 209. H.=5*5-6; G. =2*5-265; hexagonal prisms 

 and massive ; vitreous, with greasy lustre ; white, y wh, gyh brown, 

 rdh ; B.B. fuses rather easily. 



WOLLASTONITE, p. 244. H =4*5-5 ; G. =2*75-2*9 ; white, gyh, 

 rdh, bnh ; B.B. fuses easily. 



SODALITE, p. 270. H. =5*5-6 ; G. =2 13-2 4 ; white, blue, red- 

 dish ; in dodecahedrons and massive ; B.B. fuses not verv easily. 



WILLEMITE, p. 157. H.=5*5; G. =3*9-4 3; white to greenish, 

 reddish, brownish ; B.B. glows and fuses with difficulty ; reaction 

 for zinc and none for iron ; anhydrous. 



ft. Reaction for sulphur b.b. with soda. 



HAUYNITE, p. 270. H. =5*5-6 ; G. =2*4-2 5 ; blue, greenish; iso- 

 metric, in dodecahedrons, octahedrons ; B.B. fuses with some diffi- 

 culty. 



DANALITE, p. 256. H. =5 5-6 ; G. =3*427 ; isometric ; flesh-red to 

 gray ; B.B. fuses rather easily, and gives reaction for manganese 

 and zinc. 



B. Not Gelatinizing. 



1. Structure eminently micaceous, surface of folia 



more or less pearly; h. of surface of folia 



not over 3'5 ; anhydrous or hydrous. 



muscovite, biottte, phlogopite, lepidolite, le- 



PIDOMELANE : for distinctions see pp. 266-268. Anhydrous, 



