Bir. 
ae 
Bs 
at 
3 
a 
ne 
i 
A. A. Julien on Minerals of the Key of Sombrero. 375 
° 
h 
it is amorphous and there is no apparent relation between the 
monia, until half the phosphoric acid is thrown down, Int 
following table its composition, together with that of the bone 
8CaO, - —s- =: 925-04 = 1248 | 3CaO,- = - «84°39 = 54-183 
SPO,8) => 21408. 648-162 | PO sc: 1086 AEF 
439:12 100° 155°75 100° 
In this case the salt has probably been formed by the union 
of an equivalent of the neutral phosphate of lime of the original 
crystals of metabrushite with two of the bone phosphate of lime 
of the pseudomorphous solution, and the old theory of its com- 
position is thus confirmed, (rejecting the water: 
2CaO, PO,+-2(3Ca0, PO,)=8CaO, 3PO,. 
To express, therefore, the junction in this mineral of meta- 
brushite and ornithite, (soon to be described,) it may be called 
. 
the case of brushite and meta- 
variety of these pseudomorphs has been found in which the 
In the t a, 
tryoidal crusts. These are probably pseudomorphous crystals: 
® Berzelius, Traité de Chem., iv, 386. 
