Black Onyx Appraisal

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Cave Onyx Specimen

The item presented is a raw, unpolished specimen of what is identified as Cave Onyx, also known as banded calcite or flowstone. Physically, it is an irregularly shaped piece of rock, exhibiting a natural fracture. Its dimensions can be estimated by the visible measuring tape, appearing to be approximately 10 centimeters (or 4 inches) in its longest dimension. The material displays a predominant color palette ranging from light tan to a deeper reddish-brown, with visible variations in hue across its surface. There are lighter, almost white, areas suggesting distinct mineral layers or inclusions. The surface texture appears somewhat rough and porous in places, consistent with a naturally formed mineral specimen that has not undergone significant finishing. While no distinct manufacturing details, maker's marks, or signatures are visible, its very nature as a cave onyx specimen implies a natural formation process over geological time. The banded appearance, though subtle in this raw form, is a characteristic feature of speleothems like flowstone. The visible condition shows no apparent damage or repairs, rather it displays its natural state, complete with a natural patina from its formation environment. The quality of the specimen appears to be raw, indicative of a collectible piece for geological study or display rather than a finished product. Its unique aspects lie in its natural formation and potential to reveal more intricate banding or translucency if cut and polished.

Estimated Value

$15-30

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