Chemistry:Prilep ruby
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Prilep rubies are a variety of corundum found in the dolomitic marbles of the Prilep region in North Macedonia. This occurrence is scientifically notable for its specific mineralogical paragenesis including corundum, diaspore, and margarite[1].
Mineralogy and Optical Effects
The corundum from Prilep frequently contains tiny oriented inclusions of diaspore (AlO(OH)). These inclusions result from structural epitaxy between the sapphire/ruby matrix and the diaspore lamellae.
Certain specimens exhibit a distinct internal shimmering effect, often silvery or whitish, known as diasporescence[2]. This optical phenomenon is caused by light reflecting off the microscopic planes of the oriented diaspore inclusions.
Scientific Importance
The presence of diaspore inclusions serves as a key diagnostic feature for identifying the geographic origin of these gemstones. This specific type of intergrowth is characteristic of this deposit and is rarely observed with such intensity elsewhere[3].
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