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Bicolor Raw Mineral Specimen
This item is a raw, naturally occurring mineral or rock specimen, approximately 2.5 to 3 centimeters in length, held in a person's hand for scale. The specimen displays a distinctive bicolor composition, featuring a dark, matte black upper portion and a contrasting light tan or off-white lower section. The black surface appears textured with fine, white speckles or crystalline inclusions, suggesting a porous or volcanic origin like basalt, or perhaps a charred residue. In contrast, the lighter base has a granular, sedimentary appearance, similar to sandstone or limestone. The overall shape is irregular and sub-angular, indicating it has undergone some degree of natural weathering or tumbling but retains sharp facets and a jagged interior cavity. There are no visible maker's marks, as this is a natural formation rather than a manufactured object. The condition is raw and unpolished, showing natural abrasions, surface pitting, and a lack of artificial coating. The interface between the dark and light materials is irregular, suggesting a geological process where two different mineral layers were bonded together or where a secondary material infiltrated a pre-existing stone matrix. Its age is geological, likely spanning thousands to millions of years depending on its precise mineralogical identification.
Estimated Value
$15 - $35
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