652 MINERALOGY 



C. The residue after treatment in R. F. is magnetic. The bead 



shows iron. 



1. With soda in R. F. it yields a sulphur reaction. 



Pitticite, Fe, (As0 4 ), (SO 4 ).H 2 0?; Yellowish to red- 

 dish brown ; H. 2-3 ; G. 2.35 ; Massive. 



2. No sulphur, contains calcium ; &, p. 566. 



Arseniosiderite, [Fe 4 (OH) 6 ](Ca.OH) 3 (As0 4 )3 ; Yellow- 

 ish to golden brown; Silky; H. 1-2; G. 3.6; 



F. 3; Fibrous. 



Mazapilite, [Fe 4 (OH) 6 ]Ca 3 (As0 4 )4.3 H 2 0; Black to 



brownish red; H. 4.5; G. 3.57; IV. 

 3. Contains no sulphur or calcium, 



PHARMACOSIDERITE, Fe(Fe.OH) 3 (As0 4 ) 3 .6 H 2 O ; 

 Green, yellow, brown, red; H. 2.5; G. 2.95; F. 

 1.5-2; I. 



SCORODITE, FeAsO 4 .2H 2 O; Pale green to brown; 

 H. 3.5-4; G. 3.29; F. 2-2.5; IV. 



Symplesite, Fe 3 (AsO 4 ) 2 .8 H 2 O ; Blue to mountain- 

 green; Cl. Pinacoidal; H. 2.5; G. 2.95; F. Diffi- 

 cult V. 



D. Roasted and dissolved in borax on wire it shows manganese. 



1. It dissolves in HC1. liberating chlorine. 



Synadelphite, 2(Mn.Al)AsO 4 .5 Mn(OH) 2 ; Brownish 

 black to black ; H. 4.5 ; G. 3.47 ; F. 2-3 ; V. 



Flinkite, MnAs0 4 .Mn(OH) 2 ; Greenish brown; H. 

 4-4.5 ; G. 3.87 ; F. 2-3 ; IV. 



Hematolite, (Al.Mn)AsO 4 , 4Mn(OH) 2 ; brown to red; 

 Cl. basal ; H. 3.5 ; G. 3.35 ; F. Difficult ; III. 



2. Soluble in HC1 without liberating chlorine. 



Brandtite, Ca 2 Mn(AsO 4 ) 2 .2 H 2 O ; White; H. 5-5.5; 



G. 3.67 ; F. 2.5-3 ; VI. 



Berzeliite, (Ca.Mg.Mn) 3 (As0 4 ) 2 ; Sulphur- to orange- 

 yellow ; Resinous ; H. 5 ; G. 4.08 ; F. 3 ; I. 



Larkinite, Mn(Mn.OH)As0 4 ; Flesh, rose, or yellowish 

 red; Greasy; H. 4-5 ; G. 4.18; F. 2 ; V. 



Hemafibrite, Mn 3 (As0 4 ) 2 .3 Mn(OH) 2 ; F. 2?; IV. 



Allactite, Mn 3 (AsO 4 ) 2 .4 Mn(OH) 2 ; Brownish red ; H. 

 4.5; G. 3.84; F. 2?; V. 



E. The roasted mineral in the S. Ph. bead shows uranium; p. 576. 



Trogerite, (UO 2 ) 3 (As0 4 ) 2 .12 H 2 O ; Lemon-yellow; Cl. 

 pinacoidal ; G. 3.3 ; F. 2.5 ; V. 



