Brush and Penfield—Scovillite, anew phosphate. 463 
Lanthanite Ro(CO2)39H20. Seovillite R.(PO,)2H,O 
a ae eee 3°69 P.O; “84. 
(La, Di),O5... 2. 9°03 CY EpOe 55 is a5 8°51 
Re GM IN Oba 4:42 (La, Di)20s5 Soho 4614 
ae Fe, 25 
17°04¢ Hye uae 2°95 
Scovillite 2.2 22.5 82°79¢ 
Lanthanite -....- 17°04% 
Below we have given the 82°79 per cent of scovillite caleu- 
lated up to 100 per cent, and beside it that of a normal phos- 
phate of the formula R,(PO,),H,O calculated from the atomic 
weights obtained from the analyses and with (Y, Er),O,: (La, 
DDO. 
Seovillite found. Calculated. 
So cceusess meee. Or12 6 
a es Paes 10°28 11°51 
CE DE i en ce so 55°73 55°29 
ts Seas aoe 3 . 
H,0 - . «8°57 3-74 
100°00 100°00 
The only mineral which approaches this composition is 
churchite,* a phosphate of cerium, didymium and lime with four 
molecules of water. Our mineral contains less water, is free from 
cerium and lime. and differs also entirely from churchite in 
physical characters. It is, therefore, a new mineral species, and 
we propose for it the name Scovillite, after the locality where it 
was found. As to the admixture of the carbonate with the 
phosphate, we have been unable to decide whether this was due 
to a simultaneous deposit of lathanite with scovillite, or whether 
the lanthanite is subsequent in formation to the scovillite and 
a product of its alteration. At all events the carbonate is very 
intimately and constantly mixed with the phosphate, as we 
have found no single fragment which would not give off car- 
car 
ing from the alteration of the scovillite, is not present as a 
superficial coating because the fragments when dissolved in 
acids continue to give off carbonic acid until they are com- 
pletely dissolved. We take pleasure in acknowledging our 
indebtedness to Mr. Adam for calling our attention ‘to the 
peculiar character of this mineral, as well as for his kindness 
In supplying us with the material for examination. 
Sheffield Scientific School, May 8, 1883. 
* Chemical News (1865), xii, 121 and 183, 
