386 DETERMINATION OF MINERALS. 



A. Streak metallic. 



B. Streak unnietallic. 



a. Fumes sulphurous only. 



b. Fumes arsenical, with or without sulphurous. 



2. Not yielding fumes of any kind ; streak unnietallic. 



A. B.B. easily fusible, giving a magnetic bead; lustre sub 



metallic. 



B. Infusible, or nearly so. 



a. Reaction for iron ; anhydrous. 

 I). Reaction for iron ; hydrous= 



c. Reaction for chromium or titanium, 



d. Reaction for osmium with nitre. 



Y. MINERALS OF UNMETALLIC LUSTRE. 



1. Having an acid, alkaline, alum-like, or styptic taste. 



A. CARBONATES : Taste alkaline ; effervescing with HC1. 



B. SULPHATES : Xo effervescence ; reaction for sulphur 



with soda, 



C. NITRATES : With sulph. acid, reddish acrid fumes ; 



no action with HCT ; deflagrate. 



D. CHLORIDES : With sulph. acid, acrid fumes of HC1 ; 



no fumes with HC1. 



E. BORATES : Xo effervescence ; reaction for boron when 



moistened with sulph acid. 



2. Not having either of the above-mentioned kinds of 

 taste. 



A. CARBONATES : Effervescing with HC1. 



a. Infusible ; assay alkaline after ignition. 



b. Infusible ; become magnetic and not alkaline, or 



ignition. 



c. Infusible ; B.B. on coal with soda, zinc oxide 



vapors. 



d. Infusible ; B.B. on coal reaction for nickel 



e. Fusible : assav alkaline after ignition. 



E. SULPHATES : Reaction for sulphur with soda. 

 a. Fusible ; assay alkaline after fusion. 

 &. Fusible ; reaction for iron. 

 c. Infusible. 



