

TITANIUM AND TUNCSTIA MINKUALS 667 



Richterite, (Mg.Mn.Ca.Na2) 4 (SiO) 4 ; Brown, yellow, 

 ...sc-rcd; Cl. priMu:itir ; H. 5.5-6; G.3.09; F.4; V. 

 2. Fusil ility above 5. 



a. Effervesces with warm dilute HC1 (carbonates). 



RHODOCROSITE, MnCO 3 ; Rose to dark red, brown; 

 Cl. rhombohodral; H. 2.5-4.5 ; G. 3.52; III; p. 390. 



Torrensite, MnSiO 3 .MnCO 3 .i H 2 O ; Reddish gray; 



Compact. 

 6. Do not effervesce in HC1. 



+ . Yields water. 



WAD, Impure oxides of manganese; Gray, brown, 

 black; Dull; Massive; Earthy; p. 368. 



Pyrochroite, Mn(OH) 2 ; White to bronze ; Pearly ; Cl. 

 basal; H. 2.5; G. 3.26; III. 



. Yields no water. 



Manganosite, MnO ; Dark emerald-green; Cl. cubic; 



H. 5-6; G. 5.18; I. 



XI. The mineral, well powdered, is dissolved in considerable 

 quantities in the borax bead on wire. The bead is 

 then powdered and dissolved in 1 cc. strong HC1 ; 

 to the hot solution powdered tin is added. 



1. The solution is violet (titanium). If the solution is poured off the 

 tin and a few drops of hydrogen peroxide added, it be- 

 comes a deep orange or yellow according to the quantity 

 of titanium present. 



1 . Gelatinizes with HC1. Fusibility below 5. 



a. Fuses quietly. 



Schorlomite, Ca 3 (Fe.Ti.Al) 2 [(Si.Ti)0 4 ] 3 ; Black; H. 7- 

 7.5; G. 3.88; F.4; I. 



b. Fuses with intumescence. 



Tscheffkinite, Si, Ti, Th, Ce, Fe, Ca, 0? ; Velvet-black ; 

 H. 5-5.5 ; G. 4.55 ; F. 4 ; Massive. 



Rinkite, Na*, Ca n , (Ti.F 2 ) 4 (Si0 4 )i2; Straw-yellow, yel- 

 lowish brown ; Cl. pinacoidal ; H. 5 ; G. 3.46 ; V. 



2. Do not gelatinize with HC1. 

 a. Fusibility below 5. 



TITANITE, CaTiSiO 3 ; Gray, brown, green, yellow, 

 black; Cl. prismatic ; H. 5-5.5 ; G. 3.5; F. 4,; V; 

 p. 503. 



Guarinite, CaTiSiO 5 ; Sulphur- to honey-yellow; Cl. 

 pinacoidal ; H. 6 ; G. 3.5 ; F. 4 ; IV. 



