DETERMINATION OF MINERALS. 389 
Il. MINERALS, NOT ELEMENTS, THAT 
ARE WHOLLY VOLATILE B.B. 
ON. COAL. 
1. Lustre metallic ; streak metallic. 
TETRADYMITE, p. 102. G.=%2-7°9 ; pale steel-gray ; so soft as 
to soil paper ; on coal white fumes ; flame bluish-green; sometimes 
sulph. odor ; in open tube, a coating which fuses to white drops. 
BISMUTHINITE, p. 102. G.=6°4-72; whitish lead-gray;.on coal 
yellow coating and sulph. odor. 
STIBNITE, p. 100. G.=4°5-452; lead-gray ; on coal dense wh. 
fumes and wh. coating . 
2. Lustre unmetallic ; streak same nearly as color. 
ORPIMENT, p. 99. Lemon yellow ; on coal burns, odor alliaceous. 
REALGAR, p. 99.. Bright red ; on coal burns, odor alliaceous. 
ARSENOLITE, p. 99. White; on coal, cdor alliaceous. 
VALENTINITE, p. 101. White; on ccal dense wh. fumes. incd. 
CINNABAR, p. 128. Red; in open tube, sulph. odor, coating of 
mercury globules. 
SALMIAK, p. 230. White ; saline and pungent taste ; on coal, fumes 
of ammonia. 
III. COMPOUNDS OF GOLD, SILVER, MER. 
CURY, COPPER, LEAD, TIN, CHRO. 
MIUM, COBALT, MANGANESE. 
A. Yielding a malleable globule B.B. on coal, with 
or without soda. 
1. COMPOUNDS OF GOLD. 
Yield gold, or an alloyof gold and silver, B.B. on coal. The TELLU- 
RIUM ORES, pp. 115, 116, give a coating of drops of tellurous acid in 
open tube. 
2. CQMPOUNDS OF SILVER. 
B.B. easily fusible ; G. above 5; yield, with few exceptions, a glo- 
bule of silver (white and malleable), on coal, with soda, if not without ; 
and, in the exceptions, silver globule obtained by cupellation. All 
have metallic lustre excepting cerargyrite, bromyrite, and iodyrite. 
