654 MINERALOGY 



TRIPLITE, (Fe.Mn)(Mn.F)P0 4 ; Chestnut to blackish 



brown; Resinous; H. 4.6; F. 2.5; V. 

 Yields water. 

 Triploidite, (Mn.Fe)(Mn.OH)PO 4 ; Yellow to reddish 



brown; Cl. pinacoidal ; H. 4.5-5; G. 3.70; F. 3 ; V. 

 Childrenite, (Fe.Mn)(A1.2 OH)PO 4 .H 2 : Yellowish 



brown to brownish black ; Cl. pinacoidal ; H. 4.5-5 ; 



G. 3.20; F. 4; IV. 

 Perpurite, 2(Mn.Fe)P0 4 .H 2 0; Reddish purple; H. 



4-4.5; G. 3.15; F. 2. 



3. The borax bead shows iron only, 

 a. With soda it shows sulphur. 



Diadochite, 2(Fe.OH)S0 4 .2 FePO 4 .H 2 ; Yellow or yel- 

 lowish brown ; Resinous; H. 3 ; G. 2.03; F. 3?; V. 

 6. The concentrated HC1 solution shows calcium ; 6, 

 p. 566. 



Borickite, Ca(Fe.2 OH) 4 (PO 4 ) 2 .3 H 2 ; Reddish brown; 

 Waxlike ; H. 3.5 ; G. 2.7 ; F. 3 ; Massive. 



Calcioferrite, Ca 3 (Fe.OH) 3 (PO 4 ) 4 .8 H 2 ; Sulphur to 

 greenish yellow ; Pearly ; H. 2.5 ; G. 2.52 ; Massive. 



4. Yields aluminum ; b, p. 568. 



Barrandite, (AUFe)P0 4 .2 H 2 O ; Pale blue, green, or 

 yellow; H. 4.5 ; G. 2.57 ; Radiated. 



LAZULITE, (Mg.Fe)(AlOH) 2 (PO 4 ) 2 ; Azure-blue; Ci. 

 prismatic ; H. 5-5.5 ; G. 3.06 ; F. Difficult ; V ; p. 438. 



5. Phosphates of iron only. 



VIVIANITE, Fe 3 (PO 4 ) 2 .8H 2 0; Blue, bluish green, 

 white; Cl. pinacoidal; H. 1.52; G. 2.63; F. 2-2.5; 

 V; p. 516. 



Ludlamite, Fe 5 (Fe.OH) 2 (P0 4 ) 4 .8H 2 O; Pale green; CJ. 

 basal; H. 3-4 ; G. 3.12; F. 2.5 ; V; Tabular. 



DUFRENITE, Fe 2 (OH) 3 PO 4 ; Dull olive- to black- 

 green; Silky; H. 3.5-4; G. 3.31; F. 2.5; IV; p. 

 510. 



Beraunite, (Fe.OH) 3 (PO 4 ) 2 .2| H 2 ; Reddish brown ; 

 Cl. pinacoidal ; G. 2,95 ; F. 3 ; V; Foliated. 



Phosphosiderite, 2 FeP0 4 .3| H 2 ; Pale red or red- 

 dish violet ; Cl. pinacoidal ; H. 3-4 ; G. 2.76 ; F. 

 2.5; IV. 



Strengite, FePO 4 .2 H 2 ; Pale red or reddish violet ; H. 

 3-4 ; G. 2.87 ; F. 2.5 ; IV. 



