OCCURRENCE OF PRECIOUS STONES IN N.S.W. 263 
The filtrate was boiled till free from ammonia and the greater 
part of the Na,CO, neutralised with nitric acid. CaCl, was then 
added, and the precipitate of calcium carbonate and fluoride ignited 
to facilitate filtration. The CaCO, was dissolved out with acetic 
acid, and the Cal’, dried and weighed. 
Garnet—Pyrope.—These were picked out carefully from the 
gem-sand, crushed and sieved. The sample was fused with double 
carbonates, and the melt, which possessed a deep green colour, 
dissolved, and the Si O, separated. 
The iron and alumina were separated by basic acetate method, 
re-dissolved and precipitated with NH,OH, and the double oxide 
weighed. The ignited residue was fused with potassium bisulphate, 
and the iron estimated volumetrically. The filtrate from the above 
was made alkaline with NH,OH, bromine water added, and boiled, 
and the precipitate weighed as Mn,O,. The filtrate was treated 
for CaO and MgO in the usual way. 
The ferrous iron was estimated by decomposing the sample with 
repeated doses of HF in an atmosphere of coal gas, the residue 
dissolved and titrated with K,Cr,0;. 
Emerald.—The crystals were quite transparent, and perfectly 
free from any of the matrix, pulverised and fused with double 
carbonates ; the mass which was faintly green was digested with 
HCl and H,0, and the SiO, separated. The Al,O 3 was pre- 
cipitated from the filtrate after concentration by pouring it slowly 
into a strong solution of (NH,),COs, the BeO remaining dis- 
Solved. This was allowed to digest several hours to ensure the 
complete solution of the BeO, The Al,O, was filtered off, and 
After boiling off the (NH,), CO, and acidulating with HCl, the 
beryllia was finally precipitated with NH,OH as Be(OH),. This 
method of separating BeO from Al,O, is stated in Crookes’ 
“Select Methods” not to be reliable, but as a number of my — 
€xperiments gave perfectly concordant results I have no reason 
to object to it. A spectroscopic examination was made of the 
residue, obtained in the usual separation of the alkalis. The rare 
