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Gemstones, Minerals & Fossils
Gemstones and Minerals
Diamonds in Australia
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<blockquote data-quote="user 4386" data-source="post: 640779" data-attributes="member: 4386"><p>However well rounded diamonds can occur - in that case it is diamonds that were resorbed in the magma in which they occur before being shed into streams. So hardness is the most conclusive test.</p><p></p><p>Another diagnostic test is specific gravity Diamonds have a specific gravity of 3,1 to 3,5, corundum 4.0 - unfortunately topaz is 3.5. In comparison, quartz has a specific gravity of 2,6 to 2,7. Topaz will be scratched by corundum.</p></blockquote><p></p>
[QUOTE="user 4386, post: 640779, member: 4386"] However well rounded diamonds can occur - in that case it is diamonds that were resorbed in the magma in which they occur before being shed into streams. So hardness is the most conclusive test. Another diagnostic test is specific gravity Diamonds have a specific gravity of 3,1 to 3,5, corundum 4.0 - unfortunately topaz is 3.5. In comparison, quartz has a specific gravity of 2,6 to 2,7. Topaz will be scratched by corundum. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Diamonds in Australia
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