Hidden and Mackintosh—Herderite from Maine. 187 
and the solution added to the main one. The solution was 
diluted to 500° and used to determine the other constituents. 
— 200° were taken and the lime precipitated as oxalate in an 
acetic acid solution. 100° were taken and precipitated with 
ammonia. The precipitate contained all the phosphoric acid 
combined with part of the lime and all the other bases present. 
In the filtrate the excess of lime was determined as oxalate. 
The fluorine was calculated from the excess of lime. The 
glucina was determined by subtracting the lime and _phos- 
phorie acid known to be present from the ammonia precipitate 
and proved to be glucina both by its equivalent weight and by 
its reactions when afterwards separated. 
The results obtained are :— 
Found. Calculated. : 
WO tg oe. oa, 99:9) |CaG: cc ik oo hee 
GIO (or GIO.) ..._._.. ere GIO. 2 es 15°39 
Dg Hh oe es sed 44311 PD is oe 43°53 
_ ee ee i339 2 11°64 
104°60 104°89 
less O 4°76 less O 9 
99°84 100°00. 
Corresponding to the formula 
8CaO, P,O,+3G10, P,O,4+ CaF,+ GIF, 
or as it might be written, 
3(4CaO 4G10), P,O,+ ($CajGI)F,. 
The differences between the obtained and the calculated 
values are to be expected when the quantities used are con- 
sidered. The methods employed also would tend to make the 
Mineral phosphoresces brightly and becomes white and opaque. 
When moistened with cobalt solution and reheated it becomes : 
The results of “the analysis are of great interest, since it is 
the first time that glucina has been recognized in any mineral 
im any other form of combination except as a silicate or 
aluminate. 
In case the original determination of herderite, by Turner 
and Plattner, was correct, namely, an alumina lime phosphate 
fluoride, then this mineral from’ Maine is not herderite but a a 
