. Precious stones, a popular account of their characters, occurrence and applications, with an introduction to their determination, for mineralogists, lapidaries, jewellers, etc. With an appendix on pearls and coral. Precious stones; Pearls; Corals. 222 SYSTEMATIC DESCRIPTION OF PRECIOUS STONES In New South Wales there are two principal diamond districts (Fig. 43). One stretch of country extending to the north-west of Sydney, as far as the Cudgegong iver, and to the west of Sydney, as far as the Lachlan river. The other diamond IS a riv. Fig. 43. Diamond-fields of New South Wales. (Scale, 1 :
. Precious stones, a popular account of their characters, occurrence and applications, with an introduction to their determination, for mineralogists, lapidaries, jewellers, etc. With an appendix on pearls and coral. Precious stones; Pearls; Corals. 222 SYSTEMATIC DESCRIPTION OF PRECIOUS STONES In New South Wales there are two principal diamond districts (Fig. 43). One stretch of country extending to the north-west of Sydney, as far as the Cudgegong iver, and to the west of Sydney, as far as the Lachlan river. The other diamond IS a riv. Fig. 43. Diamond-fields of New South Wales. (Scale, 1 : 10,000,000.) district is in the north-east corner of the State, in the district of the Gwydir river, a tributary of the Darling; it embraces the neighbourbood of Inverel] and Bingera, and extends to the east of these townships into New England. In these districts the diamond occurs in sands together with gold and tin-stone (cassiterite), and with one possible exception it has never been found in the solid rock; it is therefore impossible to make any suggestion as to the nature of the rock in which the diamond was formed. In the southern diamond districts the diamond-bearing debris is mainly confined to ancient water-courses of Pliocene (a subdivision of Tertiary) age. When the precious stone is found in the beds of recent rivers and streams, it is always associated with material derived from these older deposits, which has been redeposited by natural agencies or during the process of gold-washing, &c. In this district the diamond is invariably accompanied by gold. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bauer, Max, 1844-1917; Spencer, Leonard James, 1870- tr. London, C. Griffin and Company, Ltd.
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