390 DETERMINATION OF MINERALS. 
a. EMINENTLY SECTILE. 
ARGENTITE, p. 117. G.=7-2-7°4; lustre metallic ; on coal sulph. 
fumes. 
CEHRARGYRITE, p. 120. G.—5-3-5°6; lustre like that of white, 
gray, or greenish to brownish wax. 
b. NOT SECTILE ; ON COAL ODOROUS FUMES. 
SULPHIDES, p. 118. Gives sulph. odor. 
ARSENICAL ORES, pp. 119, 120. Alliaceous fumes. 
SELENIDES, p. 118. Horse-radish odor. 
Cc. NOT SECTILE ; ON COAL FUMES OF ANTIMONY OR TELLURIUM. 
ANTIMONIAL ORES, pp. 119, 120. Dense white fumes of anti- 
mony; with also, if sulphur is present, sulph. fumes. 
THELLURIDES, p. 118. In open tube coating which fuses to drops 
of tellurous acid. 
STROMEYERITES, p. 119. Contains copper, and requires cupellation 
in order to obtain a globule of silver. 
3. COMPOUNDS OF COPPER. 
Unless iron is present, a globule of metallic copper is obtained with 
soda, if not without, on coal; with a nitric acid solution and ammonia 
in excess a bright blue color; moistened with HCl the blue flame of 
chloride of copper; and a clean surface of iron in the nitric solu- 
tion becomes coated with copper. 
1. METALLIC LUSTRE. 
SULPHIDES, pp. 182-1386. On coal or in open tube sulph. fumes. 
ARSENIDES, SELENIDES, p. 135. 
ANTIMONIAL SULPHIDES, p. 135, 136. 
2. LUSTRE UNMETALLIC ; B.B. NEITHER ON COAL NOR IN OPEN 
TUBE ANY ODOROUS FUMES; NO TASTE. 
CUPRITE,, p. 136. H.=3:5-4; G.=5°8-6°2; isometric; deep red, streak 
bnh-red. 
ATACAMITE, p. 136. Darkish bright green, streak gnh; B.B. on 
coal fuses, coloring O.F. azure-blue, with a green edge ; easily sol. 
in acids. 
PHOSPHATES, p. 139. 
MALACHITE, p. 140. H.=3-4; G.—3-7-4; light to deep green; ef- 
fervesces with HCl. 
AZURITE, p. 141. H.=3:5-4:5; G.=3:5-3:93"deep blue; effervesces 
with HCl. 
DIOPTASE, p.141. H.=5; G.=—825-335; emerald-green; B.B. in- 
fusible. 
CHRYSOCOLLA, p. 142. Bluish-green; B.B. infusible._ 
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