394 DETERMINATION OF MINERALS. 



HAUERITE, p. 188. H.=4; G.=3"46; isometric; reddish brown, 



streak brownish-red. B.B. yields sulphur, after roasting reaction 



for manganese. 

 ALABANDITE. p. 188. H. =3*5-4 ; G. =4 ; subnietallic, iron-black; 



streak green ; B.B. on coal sulphur, after roasting reaction for 



manganese. 



Vesuvianite, epidote, axinite, ilvaite, gothite, include varieties that 

 give reaction for manganese. 



IV. MINERALS OF METALLIC OR SUB- 

 METALLIC LUSTRE NOT INCLUDED 

 IN PRECEDING DIVISIONS. 



1. YIELDING FUMES IN THE OPEN TUBE 



OR ON COAL, BUT NOT WHOLLY 



VAPORIZABLE. 



A. STREAK METALLIC. 



MOLYBDENITE, p. 96. H.=l-l-5; G. =4*4-4-8 ; lead-gray, and 

 leaves trace on paper ; B.B. on coal sulphurous fumes 



BISMUTHINITE, p. 102. H. =2 ; G.=6-4-7'2 ; lead gray, whitish ; 

 B.B. on coal sulphurous fumes, and yellow bismuth oxide; sol. in 

 hot nitric acid and a white precip. on diluting with water 



B. STREAK UNMETALLIC. 



a. FUMES SULPHUROUS ONLY. 



PYRITE, p. 172. H. =6-6 5; G. =4*8-5 2: isometric and pyritohe- 

 dral ; pale brass-yellow, streak gnh black, bnh black ; B.B. on 

 coal, fuses to a magnetic globule. 



MARCASITE, p. 174. H.=6-6'5 ; G. =4- 68-4 85 ; trimeiric ; pale 

 bronze-vellow ; streak gyh black, bnh black ; B.B. like pvrite. 



PYRRKOTITE, p. 174/ H.=3o-4'5; G.=44-4'68; hexagonal; 

 bronze-yellow, rdh ; streak gyh black ; slightly magnetic ; B. B. 

 fuses to a magnetic mass. 



MILLERITE," p. 164. H. =3-3 5; G.=4'6-5'7, rhombohedral, 

 usually in acicular or capillary forms, also in fibrous crusts ; brass- 

 yellow, somewhat bronze-like*; B.B. fuses to a globule, reacts for 

 nickel. 



IiINNJEITE. p. 164. H.=5*5 : G. =4-8-5 ; isometric; pale steel- 

 gray, copper-red tarnish ; streak blackish -gray ; B.B. on coal fuses 



