W. P. Headden — Kehoeite, a neio Phosphate. 23 



hydrate extracts rather more zinc than the hydric acetate but 

 does not dissolve it to any great extent. Concentrated 

 potassic hydrate as well as the dilute hydric salts, i. e. HC1 . 

 H^T0 3 and H 2 S0 4 dissolve it readily and completely. The 

 washed mineral forms an impalpable powder with a specific 

 gravity of 2'34 at 15° ; it is infusible, and in the closed tube 

 yields an abundance of water. With soda on charcoal it gives 

 an incrustation of zinc oxide, obtained with some difficulty — 

 and reacts for alumina, when moistened with cobalt solution. 

 Borax and phosphorus salt dissolve it readily ; the beads are 

 slightly yellow while hot and colorless when cold. The satu- 

 rated beads become opaque upon flaming. 



The strongly ignited mineral is not completely soluble in 

 HC1, HN0 3 or in aqua regia ; the residue insoluble in these 

 acids contains alumina and zinc, but no phosphoric acid or 

 only traces of it. The air dried material loses when dried at 

 105-110°, 14*2 per cent and loses but 3 '34 per cent additional 

 between 115-120*. It required continued heating over a 

 Kellogg burner to expel the last portion of water. The 

 washed and air-dried material had the following composition : 



I. II. III. 



Insoluble 1-76 1*78 P74 



H 2 31-06 31-04 30-92 



P 2 5 26-76 26-74 26*78 



SO -50 -54 



ZnO : 11-64 11-54 11-58 



CaO 2-70 290 



A1 2 3 24-84 25-62 



Fe 2 3 -78 



MgO -08 



CI trace trace 



100-02 lOO-K 



Analysis No. I gives after deducting the insoluble- 



H 2 31-60 = 0-2808 -2808 891 9 



P (X 27-13 0-1529 ) 



S0 3 -51 0-0031 \ 



ZnO 11-74 0-0232 



CaO 2-75 0-0079 V -0314 



1560 4-96 5 



MgO ... -08 0-0003 

 A1 2 3 ... 25-29 0-1178 

 Fe 2 3 ... -79 0-0024 f 



A] Q'-- 25 1° °' l Jl^ '1202 



99-94 



The oxygen ratios correspond to 3KO + 4E 2 3 +3P 2 5 + 

 27H 3 0, or R,P 2 0, + 2Al a P 3 8 + 2Al a (OH) J , + 21H a O in which 



