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Treasure Hunting
Finds Identification and Valuation
Melted glass
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<blockquote data-quote="user 4386" data-source="post: 661160" data-attributes="member: 4386"><p>My guess would be that the granularity precludes opal - more likely chalcedony that does not display those colour characteristics. Opals are not coloured and the colours are caused by light passing through different diameter spheres with intergranular water, whereas chalcedony is just interlocking chalcedony grains (often as radial aggregates). The diffraction effect splits the passing light into different wavelengths (colours) as with a prism or rainbow. Grainsize tends to be very different, chalcedony being much larger.</p><p></p><p>[ATTACH=full]7287[/ATTACH]</p><p></p><p>[ATTACH=full]7290[/ATTACH] chalcedony</p><p></p><p>But we have nothing truly diagnostic.</p></blockquote><p></p>
[QUOTE="user 4386, post: 661160, member: 4386"] My guess would be that the granularity precludes opal - more likely chalcedony that does not display those colour characteristics. Opals are not coloured and the colours are caused by light passing through different diameter spheres with intergranular water, whereas chalcedony is just interlocking chalcedony grains (often as radial aggregates). The diffraction effect splits the passing light into different wavelengths (colours) as with a prism or rainbow. Grainsize tends to be very different, chalcedony being much larger. [ATTACH type="full" alt="1674125357576.png"]7287[/ATTACH] [ATTACH type="full" width="371px" alt="1674125513585.png"]7290[/ATTACH] chalcedony But we have nothing truly diagnostic. [/QUOTE]
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Treasure Hunting
Finds Identification and Valuation
Melted glass
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