406 DETERMINATION OF MINERALS. 
PETALITEH, p. 248. H.=—6-65; G.=2:425; white, gray, rdh, 
gnh ; B.B. becomes glassy and fuses only on the edges. 
HHBRONITE, AMBLYGONITE, p. 199. H.=6; G.=38-3-1 ; moun-- 
tain green, gyh, white, bnh; B.B. fuses very easily, reaction for 
fluorine. 
TRIPHYLITE, p. 190. H.=—5; G.=8-5-3°6; greenish gray, bluish, 
often bnh black externally ; B.B. fuses very easily, globule mag- 
netic ; with soda, manganese reaction. 
LEPIDOLITE, p. 268. H =2:5-4; G.=2°8-8 ; micaceous, also scaly- 
granular; rose-red, pale violet, white, gyh; B.B. fuses easily ; 
after fusion gelat. with HCl. Some biotite, p. 266, gives the lithia 
reaction. 
fi. B.B. boron reaction (green flame). 
TOURMALINE, p. 282. H.=7; G.=29-3°3 ; rhombohedral, prisms 
with 3, 6, 9 sides, no longitudinal or other distinct cleavage ; black, 
blue black, green, red, rarely white ; lustre of dark var. resinous ; 
B.B. fusion easy for dark var. and diff. for light. 
AXINITEH, p. 284. H.=6'5-7; G.=8 27; triclinic, sharp-edged, glassy 
crystals ; rich brown to pale brown and grayish ; B.B. fuses readily ; 
with borax violet bead. ; 
BORACITE, p. 206. H.=7; G.=2-97; isometric ; white, gyh, gnh ; 
lustre vitreous ; fuses easily, coloring flame green. 
Danburite, p. 264, is another boron silicate. 
y. B.B. reaction for titanium. 
ca 
TITANITE, p. 290. H.—5-5°5 ; G.=8-4-3°56 ; monoclinic; usually 
in thin sharp-edged crystals ; brown, ywh, pale green, black ; 
lustre usually subresinous ; B.B. fuses with intumescence. 
6. Reaction for fluorine or phosphorus. 
CRYOLITE, p. 197. H.=2°5; G.—2:9-3 ; white, rdh, bnh ; fuses in 
the flame of a candle ; soluble in sulph. acid which drives off hydro- 
gen fluoride, a gas that corrodes glass. 
FLUORITE, p. 208. H.=4; G.=8-3°25; isometric, with perfect 
octahedral cleavage, and massive ; white, wine-yellow, green, pur- 
ple, rose-red, and other bright tints ; phosphoresces ; when heated, 
decrepitates ; B.B. fuses, coloring the flame red; after ignition, 
alkaline. 
Lepidolite (p. 268), Amblygonite (p. 199), also give a fluorine re- 
action. 
APATITE, p. 212. H.=4'5-5; G.=2-9-83°25 ; often in hexagonal 
prisms ; pale green, bluish, yellow, rdh, bnh, pale violet, white ; 
B.B. fuses with difficulty, moistened with sulph. acid and heated, 
flame bluish green from presence of phosphorus ; sometimes reaction 
for fluorine. 
€, Reaction for iron. 
GARNET, p. 256. H.=6°5-7'5 ; G.=3'15-4°3 ; isometric, usually in 
- dodecahedrons and trapezohedrons, also massive, never fibrous or 
columnar ; red, bnh red, black, cinnamon red, pale green, to emerald- 
