400 DETERMINATION OF MINERALS. 
D. SILICATES, PHOSPHATES, OXIDES: SPECIES HOT IN- 
CLUDED IN THE THREE PRECEDING SUBDIVISIONS. 
I. Streak deep red, yellow, brownish-yellow, green or black. 
A. INFUSIBLE, OR FUSIBLE WITH MUCH DIFFICULTY. 
HEMATITE, p. 176. Red to black ; streak red; B.B. reaction for 
iron ; magnetic after ignition in R.I’. ; anhydious. 
LIMONITH, p 181. brownish and cchre-yellow to black ; streak 
brownish-yellow ; B.B. gives off water, turns red, becomes mag- 
netic in R.F. 
TURGITH, p. 182. Brown to black; streak red; BB. gives off 
water ; decrepitates ; becomes magnetic in R.F. 
FERGUSONITE, p. 202. Brownish black ; infusible. 
ZINCITH, p. 155. Red; streak orange; BB. cn ccal, zine cxide 
coating, and coating moistened with cobalt solution, green in R.F. 
B. FUSIBLE WITHOUT MUCH DIFFICULTY. 
WOLFRAMITE, p. 183. Grayish to brownish black ; streak dark 
reddish brown to black ; lustre submetallic; G =71-755. BB. 
fuses easily, and becomes magnetic ; reaction for tungsten. 
VIVIANITE, p. 184. Blue to green (to white); streak bluish- 
white ; G.=2°5-2°7; H.—15-2, hydrous ; B.B. fuses easily to mag- 
netic globule, coloring flame bluish-green. 
TORBERNITE, p. 170. Bright green, square tabular micaceous 
crystals ; streak paler green ; H.=2-2°5 ; hydrous; yields a globule 
_ of copper with soda. 
SAMARSKITEH, p. 202. H.=—5 5-6; G.=5 6-58; velvet-black ; 
streak dark reddish brown ; B.B. fuses on the edges. 
II. Streak grayish or not colored. 
1. INFUSIBLE. 
A. GELATINIZE WITH ACID, FORMING A STIFF JELLY. 
CHRYSOLITE, p. 255. Yellow-green to olive-green, looking like 
glass; H.=6°7; G.=3'3-35 ; B.B. reacts for iron, becomes mag- 
netic ; anhydrous. 
CHONDRODITE, p. 281. H.=6-65; G.=3-1-3:25; pale yellow 
to brown, and reddish-brown ; lustre vitreous to resinous ; B.B. re- 
action for iron and fluorine ; anhydrous. 
ALLOPHANE, p. 296. H.-=-38; G.=1°8-1:9; always amorphous, 
never granular in texture; bluish, greenish ; B.B. infus., a blue 
color with cobalt solution ; hydrous. 
Willemite, Calamine, Sepiolite, fuse with great difficulty, and are in- 
cluded under fusible gelatinizing species, p. 402. 
