Simpson — Conirib-iitions 1o Mineralogy of W.A, 
to al)out Ridgways 19’k (buffy citrine) and 21’i (olive lake). 
The powder is nearly pure white, and under the microscope 
is transparent and colorless, with the lowest refractive index 
slightly above l/)60, and with moderate birefringence. Its 
density is 3.39 and hardness 5. 
In a closed tube the mineral decrepitates slightly, gives off 
water and darkens in color, llefore the l)lowpipe it fuses rather 
readily to a black slag. 
The powder moistened with strong sulphuric acid does 
not etch glass, but gives a strong lithium flame. Ground fine 
the mineral dissolves rather slowly in cold dilute (5E) HNO 3 ,, 
IJCl or H2SO4, but rapidly in all three when warmed. An 
analysis of carefully selected material showed the presence of 
006 per cent, moisture and 0.72 insoluble matter of which 0.58 
was silica. Deducting these impurities the results obtained were: 
V 2 O,. AlnO. FcO. CaO. MgO. LyO. Na^O. K^O. ITO+ Total. 
45.99 30.80 10.44 2.78 0.94 7.87 0.34 nil 1.11 100.27 
A duplicate determination of the Li^O by another analyst gave 
7.88 per cent. The corrected density of the analysed material was 
3.39. Tlie analytical figures yield ratios: P 2 O 5 :(Mn,Fe)0 :(Li,H )20 
of 0.990:1.995:1.012. theory requiring 1:2:1. 
Other tlian tlie i)rodncts of its own decomposition the only 
foreign mineral visil^le in the specimen was quartz in small 
amount. It would appear as if tlie boulder were shed from a 
pegmatite vein. 
The only other phosphate known in the district is apatite, 
which occurs in large masses up to several kilos in weight. 
(2). Leuciic, Fitzroy Valley, Kim. I)iv. 
A number of small plugs of a volcanic agglomerate rich in 
leucite have been discovered h\' Messrs. T. Rlatchford and 
H. W. B. Talbot in tlie middle hitzroy valley where they rise 
through upper Larlsoniferous sandstones and shale in the form 
of small hills along a line running north 65° west. The eastern- 
most dome is at Survey station C.48 on Christmas Crk. (Lat. 
18°4r S., Long. 125°37' E.), the westernmost at "B.E.” Hill (Lat. 
17 57 S.. Long. 124°19' K. ), 13 miles N.W. of Mt. Wynne, the 
distance between the two being 100 miles. Mr. J. E. Wells has 
also discovered an isolated neck of the same rock at Mt. North 
(Lat. 17°29' S.. Long. 124°49' E.), 45 miles N.E. of B.E. hill. The 
rocks have been very briefly referred to by R. A. Farquharson 
