Black Opal Heart
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Opal crystallizes in the form of masses, and, occasionally, stalactites. When precious opal is viewed through this microscope, it is seen as a uniform stacking and sizing of a great number of tiny spheres. It's the size within any grouping of these spheres that determines the colour. Opal without colour contains spheres which are not of orderly size or stacking.
This Black Opal Heart is approximately 3”