388 DETERMINATION OF MINERALS. 



I. ELEMENTS. 

 1. Lustre metallic ; liquid. 



MERCURY, p. 128. This is the only metallic mineral which is liquid 

 at the ordinary temperature and atmospheric pressure. 



2. Lustre metallic ; malleable aud eminently sectile. 



GOLD, p. 109. G.=lo-19 - 5 ; yellow ; fusible ; not sol. in nitric acid 



or HC1, but sol. in aqua regia. 

 PLATINUM, p. 124. G. =16-19 ; nearly white ; infusible ; insol. in 



nitric acid. 

 PALLADIUM, p. 127. G.=ll'3-ll-8 ; grayish-white ; dim fusible ; 



sol. in nitric acid. 

 SILVER, p. 116. G. =10-11-1; white; fusible; sol. in nitric acid, 



and deposited again on copper. 

 COPPER, p. 131. G.=884; copper-red; fus. ; sol. in nitric acid, 



and the solution becomes sky-blue when ammonia is added 

 IRON, p. 171. G. = 7*3-7*8; iron-gray; attracted by the magnet. 



The only other mineral of metallic lustre that is also malleable and 

 eminently sectile is argentite, a silver sulphide, along with two others 

 of like composition but different crystallization. 



3. Lustre metallic ; brittle ; B.B. wholly volatile, 



but give off no sulphurous fumes. 



BISMUTH, p. 101. G.=9 73 ; reddish-white ; on coal a yellow coat- 

 ing ; fumes inod. 



ANTIMONY, p. 100. G. =6-6-6'7; tin-white ; fumes dense wh., inod. 



ARSENIC, p. 98. G. =5 9-6 ; tin-white ; fumes white, alliaceous. 



TELLURIUM, p. 96. G.=61-63 ; tin- white ; fus.; fumes white ; 

 flame green. 

 The only other mineral that is wholly volatile, and also gives off no 



sulphurous fumes, is allemontite, an antimony arsenide. 



4. Lustre metallic ; H. =1-2 ; B.B. on coal infusible ; 



no fumes. 



GRAPHITE, p. 107. 



5. Lustre unmetallic ; takes fire readily in the flame 



of a candle, and burns with a blue flame. 



SULPHUR, p. 94. 



6. Lustre adamantine ; H. =10. 



DIAMOND, p. 103. Easily scratches corundum or sapphire. 



