XI 
1879. — Fire clay from Bunker 
White Cliffs Opal Fieh 
Moisture at 100° C 
Combined water 
Silica (SiOj) 
Alumina (AbOj) 
Ferric oxide (FejO,)) 
Ferrous oxide (FeO) 
Manganous oxide (MnO) 
Copper oxide (CuO) 
Lime (CaO) 
Strontia (SrO) 
Magnesia (MgO) 
Potash (K,(t) 
Soda (NasO) 
Phosphoric acid (ILOj) 
Vanadium Pentoxide (VjO^,) 
Titanic acid (TiO>) 
Sulphur trioxide (SO3) 
Chlorine (Cl) 
Creek, near 
1 . 
I’cr cent. 
3 08 
7-30 
63-55 
‘21-80 
-57 
-‘21 
..minute trace 
..minute trace 
-32 
-64 
-71 
minute trace 
03 
-24 
-04 
-64 
100-60 
Less oxygen equivalent for chlorine ‘14 
100-55 
1881. — Material occurring just below seam of 
opali.sed bivalve shells, White Cliffs Opal 
Field. 
Per cent. 
>roisture at 100° G 3*83 
Combined -water 8-27 
.Silica (SiOd 61 60 
Alumina (AljOj) 23 32 
Ferric oxide (Fe^Oa) -80 
Ferrous oxide (FeO) '18 
Manganous oxide (MnO) minute trace 
Lime (CaO) ‘48 
Magnesia (MgO) ‘70 
Potash (KjO) -27 
Soda (NajO) -24 
Phosphoric acid (P2O5) minute trace 
Vanadium pentoxide (V20j) '01 
Titanic acid (Ti02) '72 
Chromium sesquioxide (Cr-iOj) — 
Sulphur trioxide (SO3) — 
Chlorine (Cl) trace 
100-42 
1566. — Wdiite siliceous rock from Bunker Creek, 
near White Cliffs Opal Field. 
Per cent. 
Moisture at 100° C I 'OU 
Combined water 7 89 
Silica (SiO-2) 66 14 
Alumina (AI2O3) 21 '43 
Ferric oxide (Fe-203) -78 
Ferrous oxide (FeO) — 
Manganous oxide (MnO) absent 
Lime (CaO) -41 
C 
Per cent. 
Magnesia (MgO) -45 
Potash (K2O) -08 
Soda (Na20) -IG 
Pho.sphoric .acid (PjO^) minute trace 
.Sulphur trioxide (SO2) 'll 
Chlorine (Cl) -17 
Organic matter trace 
100-41 
Oxygen equivalent of chlorine '0 
100-41 
188.3. — White Cliffs Opal Field, just above the 
third opal seam. 
Pur cent. 
Moisture at 101° C 2 37 
Combined water 9 33 
Silica (SiO-d 59 04 
Alumina (AljOj) 25’44 
Ferric oxide (Fe2C'3) .... -59 
Ferrous oxide (FeO) 27 
Manganou.s oxide (MnO) minute trace 
Lime (CaO) -74 
Magnesia (MgO) '47 
Potash (K.O) -35 
.Soda (NajO) '38 
Phosphoric acid (P2O5) '02 
Vanadium pentoxide (V2O3) trace 
Titanic acid (Ti02) ‘57 
Sulpliur trioxide (SOj) '00 
( 'hlorine (Cl) '02 
100-25 
1880. — Gritty Rock, Bunker Creek, near White 
Cliffs Opal Field. 
Per cent. 
Moisture at 100° C 4'81 
Combined water 8 '23 
Silica (SiO.) 62 '83 
Alumina (AI2O3) .! 20'00 
Ferric oxide (Fe.jOi) '27 
Ferrous oxide (FeO) '28 
Manganous oxide (MnO) minute trace 
Lime (CaO) '35 
Magnesia (MgO) '48 
Potash (KoO) ‘71 
Soda (Na^O) — '43 
Phosplioric .acid (P2OJ '01 
Vanadium pentoxide (VjOj) trace 
Titanic acid (TiOi) '96 
Sulphur trioxide (SOd 
Chlorine (Cl) 1'17 
100-75 
Less oxygen equivalent for chlorine '26 
100 50 
