666 . MINERALOGY 



Rose to brown ; Cl. basal ; H. 5-5.5 ; G. 2.92 ; F. 



3; III. 



+. Yields water. 

 Ganophyallite, Mn 7 (AlO) 2 (SiO 3 )8.6 H 2 O; Brown; Cl. 



basal; H. 4-4.5; G. 2.84; F. 3; V; Foliated. 

 Dissolves in HC1, liberating hydrogen sulphide. 

 Helvite, (Mn.Fe) 2 (Mn 2 S)Be3(S:O 4 )3; Yellow, brown, 



green, red; H. 6-6.5 ; G. 3.20; F. 4-4.5; I. 



b. Decomposed in HC1 without gelatinizing. 

 +. Yields water. 



Friedelite, H 7 (MnCl)Mn 4 (Si0 4 )4; Rose-red; Cl. basal; 



H. 4.5; G. 3.07; F. 4; III. 

 Bementite, H 2 MnSiO 4 ; Pale grayish yellow ; Cl. basal ; 



H. 2.5-3; G. 2.98; F. 3.5 ; Foliated. 

 Inesite, (Mn.Ca) 2 (Si0 3 ) 2 .H 2 O ; Rose- to flesh-red ; Cl. 



pinacoidal; H. 6; G. 3.03 ; F. 3 ; VI. 

 . Yields no water. 

 Trimerite, Be(Mn.Ca.Fe)SiO 4 ; White to salmon-pink; 



Cl. basal ; H. 6-7 ; G. 3.47 ; F. 4-5? ; VI. 

 Dissolves in HC1 yielding hydrogen sulphide. 

 ALABANDITE, MnS; Iron- to greenish-black; H. 



3.5-4 ; G. 3.95 ; F. 3 ; I ; p. 304. 



c. Insoluble in HC1. 

 + . Yields water. 



Piedmontite, Ca2(Al.OH) 2 (Al.Mn.Fe) 2 (SiO 4 ) 3 ; Reddish 

 brown; Cl. basal; H. 6.5; G. 3.5; F. 3 ; V; 

 p. 467. 



Carpholite, Mn(A1.2 OH) 2 (SiO 3 ) 2 ; Straw- to wax-yellow ; 

 Silky; H. 5-5.5 ; G. 2.93 ; F. 3 ; V; Fibrous. 



. Yields no water. 



Neptunite, (Na.K) (Fe.Mn) TiSi 4 O 12 ; Black; Cl. pris- 

 matic ; H. 5-6 ; G. 3.23 ; F. 3.5 ; V. 



SPESSARTITE, Mn 3 Al 2 (Si0 4 ) 3 ; Brownish to garnet- 

 red ; H. 7-7.5 ; G. 4.2 ; F. 3 ; I ; p. 444. 



Partschinite, (Mn.Fe) 3 Al 2 (Si0 4 ) 3 ; Yellowish red ; Greasy; 

 H. 6.5-7 ; G. 4.00 ; F. 3 ; V. 



RHODONITE, MnSiO 3 ; Rose-red, pink, brown; Cl. 

 prismatic ; H. 6-6.5 ; G. 3.63 ; F. 3.5 ; VI ; p. 430. 



Schefferite, (Ca.Mn)(Mg.Fe)(Si0 3 ) 2 ; Yellowish to red- 

 dish brown; Cl. prismatic; H. 5-6; G. 3.5; F. 4; 

 V. 



