270 J. MILNE CURRAN. 
Fig. 2—Topaz, shewing a parcel as usually placed on the market. 
are of first quality, and represent the choice specimens from at 
least twenty times their weight of inferior material. Photographed 
natural size. 
Plate XV. 
Fig. 1—At the Emerald Proprietary Mine patches of kaolin are found 
which are embeded long slender crystals of beryl and aqua-marine, 
sometimes deep enough in colour to come under the heading of emerald. 
The plate shews the appearance and habit of these crystals. Photo- 
oe natural size 
aqua-marine and emerald from various localities on the 
hats ean sate re-produced natural size. They were all found — 
in working alluvial deposits for tinstone. 
Plate XVI. 
Fig. 1—Diamonds found at Bingara. Natural size. As stated in the 
text, ee larger stones are often discovered, but the photograph shews 
the average samples sent from Bingar 
Fig. 2—Sapphire as found in the tin bearing drifts in the district 
around Emmaville. Natural size. The sider are for the most part 
blue, but nine of those figured are green. Some of the examples are 
banded alternately in white and ai e. A few cae tae crystals are 
tipped with blue. Some of the stones shew the corosion lines referred to 
in the text. 
Plate XVII. 
The bulk of the Queensland opal comes to market embedded in a hard 
ironstone matrix as shewn in Fig 1, while all the White Cliffs opals ss 
found in a friable and easily pulverulent matrix, and are sent down quite 
free from matrix, as shewn in Fig. 2. Both figures natural size. 
Plate XVIII. 
Fig. 1—Tin sluicing boxes, Emmaville. Sapphire is saved in these 
sluice-boxes. 
Fig. 2—A cradle used in 2 saving, Tumberumba Creek. Sapphire 
is recovered by these machines 
Plate XIX. 
ve + Opet mining at Lelboays ee N. 8. Wales. The pillars left 
th emoved. The pi 
have bated left for: the same pein that some : anak is left standing in 4 
coal mine, to support the roof. 
Fig. 2—General aspect, of diamond bearing country at Bingara. 
