Goethite On Calcite Mineral Specimen Appraisal

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Goethite on Calcite Mineral Specimen

This specimen features a striking geological association between two distinct mineral habits. The primary feature is a large, domed mass of druzy calcite crystals, appearing in an off-white to creamy color. This calcite formation displays a sugary, micro-crystalline texture with a high surface area that reflects light in a soft, scattered manner. Contrasting sharply against this is a dense, jagged cluster of goethite, an iron-bearing mineral. The goethite exhibits a dark metallic black to deep charcoal gray coloration with a somewhat sub-metallic luster. The construction of the goethite portion shows acicular or bladed crystal growth patterns, creating a rugged, irregular profile typical of secondary iron oxide minerals. As a natural geological specimen, there are no maker's marks or stamps; however, the quality of both the calcite dome and the dark mineral cluster suggests a significant period of undisturbed growth in a hydrothermal environment. The item appears to be in its raw, natural state with visible internal fractures and minor chipping around the edges consistent with the extraction process from its parent host rock. There are no signs of artificial stabilization or dyeing, preserving its categorical value as a natural mineral collective.

Estimated Value

$450 - $650

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