DETERMINATION OF MINERALS. 391 
3. LUSTRE UNMETALLIC; B.B. ON COAL, OR IN CLOSED TUBE, ODOROUS 
FUMES OF ARSENIC OR SULPHUR, OR REACTION FOR SULPHUR. 
ARSENATSES, p. 189. On coal arsenical fumes. 
CHALCANTHITE, p. 187. Elue; taste nauseous; astringent. 
Also Stromeyerite, Stannite, Bournonite give reactions for copper. 
4, COMPOUNDS OF LEAD. 
_ Yield B.B. on coal a dark lemon-yellow coating ; finally, with soda, 
if not without, a globule (metallic and malleable) of lead is ob- 
tained ; but by continued blowing with O.F. the lead all goes off in’ 
fumes, leaving other more stable metals (silver, etc.) behind. Sul- 
phurous, selenious and tellurous fumes easily obtained either on 
coal or in an open tube from the sulphide, selenide, tellurides ; and 
arsenical or antimonial fumes from ores containing arsenic or anti- 
mony. None have taste. 
1. LUSTRE METALLIC. 
GALENITE, pv. 145. H.=2°5; G.=7-2-7-7; cleavage cubic eminent ; 
lead-gray, streak same ; in open tube sulph. 
SELENIDES, THLLURIDES, ANTIMONIAL and ARSEN- 
ICAL SULPHIDES, page 149. 
2. LUSTRE UNMETALLIC ; NO ODORCUS FUMES, OR REACTION FOR 
SULPHUR. 
MINIUM, p. 149. Bright red, streak same. 
CROCOITE, p. 150. Monoclinic ; bright red, streak orange-yellow ; 
B.B. with salt of phosphorus emerald-green bead. 
PYROMORPHITS, p. 151. Hexagonal; bright green to brown, 
rarely orange-yellow ; streak white. B.B. fuses easily, coloring 
flame bluish-green. 
CERUSSITE, p. 152. Trimetric, often in twins; H.=3-3°0; 
G.=6-468; white, gyh; lustre adamantine; often tarnished to 
grayish metallic adamantine. Effervesces in dilute nitric acid. 
3. UNMETALLIC ; REACTION FOR SULPHUR. 
ANGLESITE, page 150. Trimetric ; white, gyh; fuses in flame of 
candle ; B.B. reaction for sulphur ; no effervescence with acids. 
5. COMPOUNDS OF TIN. 
CASSITERITE, p. 160. H.=6-7; G.—6-4-7°1; brown, gyh, ywh, 
black ; B.B. infusible; on coal with soda a globule of tin, yield 
no fumes. E 
Stannite, p. 158. A copper, iron, and tin sulphide, does not give 
B.B. a cca malleable globule. 
