354 Lee and Be Moraes — Ferrazite. 



Calculating anew the composition of the new mineral 

 on a centesimal basis, we have : — 



Molecular ratios 



Combined water 13-58 0-7544 



Lead oxide 49-65 0-2227 



Barium oxide 9-65 0-0631 



Phosphoric anhydride 27-12 0-1910 



100-00 



Becalculating these molecular ratios on a basis of P 2 5 

 equal to 2, we have : — 



Combined water 7-900 



Lead and barium oxides 2-993 



Phosphoric anhydride 2-000 



or 3 (Ba,Pb)0.2P 2 5 .8 H 2 0. 



The density of the "favas" varies between 3-0 and 

 3-3. The color is a dark yellowish- white, resembling that 

 of old ivory. The specimens are discoid in shape, and 

 thin sections show under the microscope a granular struc- 

 ture suggesting that resulting from the evaporation of 

 a colloid substance. 



Dana's System of Mineralogy, 6th Ed. with Supple- 

 ments I and II mentions no such mineral, although it 

 includes all Damour's results, so that we feel justified in 

 claiming novelty for the mineral, and suggest for it the 

 name of Ferrazite, in just recognition of Ferraz's valu- 

 able work in editing Hussak's posthumous work, and in 

 classifying and rendering available the precious mineral 

 collection left by him. 



