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Australasian rubies

Citation

Sutherland, L and Graham, I and Harris, S and Zaw, K and Meffre, S and Coldham, T and Coenraads, R and Sutherland, G, Australasian rubies, Australian Gemmologist, 26, (5-6) pp. 68-76. ISSN 0004-9174 (2017) [Professional, Non Refereed Article]


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Abstract

Rubies occur in sporadic deposits across the continental exposures of Australasia, although quite subordinate to sapphires, which are actively mined in a few gem fields. The main ruby finds are in alluvial placer deposits shed from . Cenozoic basalt fields in eastern Australia, where corundum was brought up by eruptions as resistant crystals from underlying crustal and mantle sources. These rubies all show differences in inclusions, trace element signatures and oxygen isotope values reflecting origins from diverse metamorphic bodies. Barrington Tops rubies show intergrowths with sapphirine and Cr-bearing spine! and supplied a ruby mining venture. Cudgegong-Macquarie River Mg-rich high temperature rubies may represent diamond zone indicators. New England zoned rubies are unusual Ga-rich types, different to most rubies in general. Elsewhere, in central and western Australia, a few ruby finds are known in older metamorphic rocks. At Harts Range, ruby crystals in feldspathic lenses within deformed metamorphic schists and gneisses were worked for cabochon and specimen material. At Hokitika, South Island New Zealand, a unique ruby-rich metamorphic rock is worked for ornamental jewellery. Commercial ruby deposits are very limited in Australasia, however, the known ruby finds provide a scientific 'bonanza'.

Item Details

Item Type:Professional, Non Refereed Article
Keywords:sapphire, ruby, gem deposits
Research Division:Earth Sciences
Research Group:Geology
Research Field:Mineralogy and Crystallography
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Zaw, K (Professor Khin Zaw)
Author:Meffre, S (Dr Sebastien Meffre)
ID Code:121982
Year Published:2017
Funding Support:Australian Research Council (CE0561595)
Deposited By:CODES ARC
Deposited On:2017-10-24
Last Modified:2017-10-25
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