390 DETERMINATION OF MINERALS. 



a. EMINENTLY SECTILE. 



ARGENTITE, p. 117. G. = 7-2-7 '4; lustre metallic ; on coal sulph. 



fumes. 

 CERARGYRITE, p. 120. G.=5-3-56; lustre like that of white, 



gray, or greenish to brownish was. 



b. NOT SECTELE ; ON COAL ODOROUS FUMES. 



SULPHIDES, p. 118. Gives sulph. odor. 

 ARSENICAL ORES, pp. 119, 120. Alliaceous fumes. 

 SELENIDES, p. 118. Horse-radish odor. 



C. 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. 



TELLURIDES, p. 118. In open tube coating which fuses to drops 

 of tellurous acid. 



STROME YERITE, p. 119. Contains copper, and requires cupellatkm 

 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 HC1 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. 



SULPHDDES, pp. 132-136. On coal or in open tube sulph. fumes. 

 ARSENLDE5. SELENIDES, p. 135. 

 ANTIMONIAL SULPHLDES, 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-&-6'2; isometric; deep red, streak 

 bnh-red. 



AT AC AMITE, p. 136. Darkish bright green, streak gnh; B.B. on 

 coal fuses, coloring OF. 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 HC1. 



AZURITE, p. 141. H. =3-5-4-5; G. =3 5-3 9; deep blue ; effervesces 

 with na. 



DIOPTASE, p. 141. H. = 5; G. =3 25-3 35; emerald-green; B.B. in- 

 fusible. 



CHRYSOCOLLA, p. 142. Bluish-green; B.B. infusible. 



