MINERALS llAViv; TASTE 





Polycrase, Ch, Ti. Y I |, . 1 1. <)'.'; Black] Sir. 



( iravish bn.wii ; II. f, ; (i. li.K). 

 Polymignite, ( 'I., /r. Ti. ( ,. TI,. O ^ I . " ' : I Mark ; 



Str. Dark brown; II. i.5; G. 4.8 ; IV. 

 1). I!, m-ts for tanttilnni; $ n, p. :>7 1 ; onlij xliyht reaction if any for 



col unthi mil. 

 Tantalite, FeMnTasO,,; Black; Str. Black; H. 6j 



G. 7.15; IV. 

 Tapiolite, FeTa^Oe; Black; Str. Black; H. 6; G. 



7.43; II. 

 Hielmite, Ta, Cb, Sn, U, Y, Ce, Fe, Mn, Ca, H, O?; 



Black; Str. Grayish ; H. 5; G. 5.8 ; IV. 

 Yttrotantalite, (Fe.Ca) (Y.Er.Ce) 2 (Ta.Cb) 6 O, 6 4 H 2 O ; 



Brown to black ; Str. Gray; H. 5-5.5; G. 5.70; IV. 



PART II 



NON-METALLIC MINERALS, OR MINERALS WITHOUT METALLIC OR 

 SUB-METALLIC LUSTER 



I. Having taste, or those easily soluble, or soluble to a large extent 

 in water. Hardness below 3. No arsenic or copper 

 minerals arc placed in this division. 

 A . Dissolved in dilute HCl, yields a while precipitate with barium 



chloride (sulphates). 

 1. Heated on coal in the R. F. it becomes magnetic. 



a. Heated on wire it yields a strong yellow flame (sodium). 

 Sideronatrite, Na2(Fe.OH)(SO 4 ) 2 .2 H 2 O; Orange to 

 L. Silky; H. 2-2.5; G. 2.35; F. 2; IV; 



yellow ; 



Fibrous. 



Ferronatrite, 



Na,Fe(SO 4 ) 3 .3 H 2 O ; Pale green; H. 



2; G. 2.55; F. 1.5; III; radiated. 

 6. Heated on wire it yields a violet flame (potassium). 



JAROSITE, K(Fe.2 OH) 3 (SO 4 ) 2 .2 H 2 O ; Yellow to 

 L. Vitreous; H. 2.5-3.5; G. 3.2; F. 4.5; 



brown ; 

 III. 

 Metavoltaite, 



(K 2 .Na,.Fe) 5 Fe 2 (Fe.OH) 4 (SO 4 ) 12 16 H 2 O ; 



c. 



Yellow; H. 2.5 ; G. 2.53 ; F. 4.5; III; Scales. 

 Fused with soda and niter in the O. F. shows man- 

 ganese. 



