640 MINERALOGY 



3. It yields a green flame (barium). 



Nitrobarite, Ba(N0 3 ) 2 ; White; Vitreous; H. 2.5; 



G. 3.20; F.l-1.5; I. 

 E. With turmeric paper the HCl solution shows boric acid; 6, 



p. 592. 

 1. In the closed tube yields water. 



BORAX, Na2B 4 O 3 .10 H 2 ; Vitreous; H. 2-2.5; 



G. 1.72; F. 1-1.5; V; p. 522. 

 Sassolite B(OH) 3 ; White; Pearly; H.I; G. 1.48; 



F. 0.5 ; VI. 



II. Easily and completely volatile (when pure) in a gentle O. F. 

 If the mineral decrepitates, it should be heated in a 

 closed tube, when it should volatilize and yield a 

 sublimate. 



A. The mineral burns with a blue flame, yielding sulphur dioxide. 



SULPHUR, S; Pale yellow; Resinous; H. 1.5-2.5; 



G. 2.07; F. 1; IV; p. 285. 



B. With soda in R. F. on coal it yields an arsenic odor. 



1. Fused with soda in R. F. it yields on silver a sulphur re- 



action. 



. Yields no green flame. 



REALGAR, AsS ; Aurora-red; Resinous; H. 1.5-2; 

 G. 3.55; F. 1; V; p. 294. 



ORPIMENT, As 2 S 3 ; Lemon-yellow; Pearly to resin- 

 ous; H. 1.5-2; G. 3.48; F. 1 ; V; p. 295. 



+ . It yields a green flame (thallium). 



Lorandite, Tl 2 S.As2S 3 ; Carmine-red ; Adamantine ; 

 H. 2-2.5 ; G. 5.53 ; F. 1 ; V. 



2. It yields no sulphur reaction with soda. 



Arsenolite, As 2 O 3 ; White; Adamantine; H. 1.5; 



G. 3.70 ; Volatile ; I ; p. 346. 

 Claudetite, As 2 O 3 ; White; Pearly; H. 2.5; G. 4.00; 



Volatile; V. 



C. Yields a white coat which colors the inner flame pale yellowish 



green (antimony) ; p. 584. 



1. With soda it yields a sulphur reaction. 



KERMESITE, Sb 2 S 2 Q ; Brownish red to maroon; 

 H. 1-1.5; G.4.60; F.I; V. 



2. Yields no sulphur reaction with soda. 



Senarmontite, Sb 2 O 3 ; White ; Adamantine ; H. 2-2.5 ; 

 G. 5.25; F. 1.5; I. 



