72 QUEENSLAND GEMS 
All the other varieties of quartz stones, including 
avanturine, bloodstone, cat’s eye, citrine, hyacinth, plasma, 
prase, rock crystal, sardonyx, etc., are found widely dis- 
tributed throughout Queensland. 
EMERALD.—Composition : Silica. 
‘Alumina. 
Glucina 
Hardness, between 7.5 and 8. 
S.G., 2.7, about. 
Form, regular six-sided prism. 
The prism is often striated both internally and externally, 
parallel with its sides. Emeralds have been found near 
Herberton, and a further find has been reported in the far 
North West, exact locality unknown. The crystals shown 
in the collection are from Emmaville. 
Brryu.—lIs found in several places in this State. The 
crystals exhibited are from near Texas. It is often found 
in the tin wash about Stanthorpe, and near Herbeton. 
TuRQUOISE.—Has been found at Keppel Bay, and also 
in one or two other places in the State. Stones exhibited 
are green turquoise in matrix. colour being a very pleasant, 
rich green. No deep sinking has been done on this find 
of turquoise, and it is fully anticipated that the quality 
will improve as they go down. 
Topaz.—-Crystals are prisms usually having one end 
regularly terminated. 
Basalt cleavage highly perfect, Refraction strong: 
The topaz occurs in many different districts in Queens- 
land, has been found close to Brisbane, Toowoomba, 
Stanthorpe, Boonah, Mount Lindsay, Kilkivan, Nanango, 
Herberton, and many other places. It is found of pure 
limpidity, both as crystals and pebbles, also of different 
shades of yellow and many shades of light bule. Some 
of the blues found have been almost like pale blue sapphires. 
My firm has cut a magnificent and flawless stone, of 
78 carats, for Mrs. Skertchly, which is probably the largest 
blue topaz found since the beginning of the last century. 
The white topaz, when brilliant cut, can easily be 
mistaken for the diamond, the only difference being that 
the diamond is iridescent. 
