462 Brush and Penfield —Scovillite, a new phosphate. 
The filtrate from the precipitated sulphates of the cerium 
metals was treated with ammonium oxalate to separate the 
yttrium metals. The precipitate of the latter being impure, it 
was in all cases redissolved and reprecipitated, and after igni- 
tion weighed as oxides. No attempt was made to separate 
weight of oxide into anhydrous sulphate, gave 115, indicating 
that the proportion of yttrium is about twice that of the erbium. 
Analyses I, I, an were made on about ‘5 gram; 
analysis V on about a gram. The results are as follows: 
UR rT UT. IV. V. Mean. Ratio. 
C2 is Gea e 24°96 eas 25°00 of 94°94 ‘LT56 
(0,,8n03 eee 8°34 8°51 +0306 
oe rN eae 55°30 54: sa *y 5517 =*1656 + "1977 
Boe cia os ue as "24 “26 25. °0015) 
ats ghee ae 5-88 5°88 3267 
Ae te ae 9°36 
HO 1 lost at TOG: 1°50 1:49 1°49 ‘0828 
Ws yes wee. 3°59 3°59 +0814 
99°83 
In discussing these analyses the question at once arises as to 
whether the carbonic acid found is an essential constituent of 
the mineral. e carbonate does not appear to bear any simple 
relation to the phosphate, and we have thought best to regard 
it as due to an admixture of lanthanite (La, Di),(CO,),9H,0. 
Regarding the water given off at 100° C. as Dei bile only 
three molecules in the above formula, the remaining six goin 
off at a higher eas pigs we have the ‘clone ratio 
calculated with CO, as a bas 
R,O, : 3CO, : 9H,O=" aa. : 0814 :°2456=1: 8: 9°06 
and there remains, after deducting the above, the ratio 
R.0,: ,0,: H,O='1756:: :1706.: -1689=1.: 0°97 : 0°93 
or the ratio of a normal phosphate, plus one molecule of water 
=R,(PO,),H 
If the water given off at 100° alone teresa to the carbonate, 
we have the following ratio for the car 
R,0,: CO,: H,O=-0271 : 0814 : -0828=1:3 Wie OE 3H,0 
and for the phosphate: 
R,0,: P,O,: H,O="1756 : -1706 : 
=1200TsI ee RPO), 2H,0 nearly. 
The former seems the sp natural supposition and barainoe 
for a carbonate which is known to exist. The min 
analyzed may then be considered a mixture of ‘aaetts wilt 
the new phosphate in the following proportion: 
