Prilep ruby

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].

References

  1. ^ Barić, Lj. (1969). Dolomitmarmor in der Umgebung der Stadt Prilep und die in ihm vorkommenden Minerale.
  2. ^ Jeršek, M. (2015). Diasporescence in rubies from Prilep dolomitic marble.
  3. ^ Jeršek et al. (2021). Diasporescence in rubies from Prilep.

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