This impressive 494-gram calcite cluster from the Daye copper mining district in Hubei Province, China, dazzles with a natural metallic rainbow sheen — the result of delicate microcrystals of chalcopyrite and pyrite coating the calcite’s surfaces. Unlike artificial aura treatments, this vibrant luster is entirely natural, formed through subtle geochemical oxidation processes that created one of nature’s most captivating visual effects.

Each calcite crystal face reflects a spectrum of iridescent tones — gold, violet, green, and pink — shimmering softly as light moves across the specimen. The combination of crisp calcite geometry and the micro-sulfide coating yields extraordinary texture and depth, perfectly balancing metallic brilliance with mineral elegance.

From the renowned Daye mining district, a locality celebrated for its copper-sulfide mineralization and secondary calcite formations, this specimen exemplifies the synergy between structure and color that makes Daye pieces globally admired. Measuring approximately 107 × 69 × 105 mm, it displays beautifully from multiple angles and stands as both a geological and aesthetic highlight in any fine mineral collection.

The condition is superb — clean, well-terminated calcite crystals with minimal matrix exposure. Under magnification, the surface reveals a glittering tapestry of micro chalcopyrite and pyrite crystals, the true source of the rainbow iridescence. This is a showpiece-quality specimen that merges science and beauty, perfect for collectors seeking mineral art formed entirely by nature.

Weight: 494 g (1.09 lb)
Locality: Daye, Hubei Province, China
Dimensions: Approx. 107 × 69 × 105 mm

Highlights:

• Iridescent calcite coated with natural pyrite and chalcopyrite

• Vibrant rainbow tones from natural oxidation

• Excellent crystal form and strong aesthetic geometry

• Classic Daye locality known for metallic-coated calcite

• Collector-grade specimen, completely natural finish

Collector Notes:
Daye calcite specimens are renowned for their metallic coatings — a result of natural oxidation processes unique to this copper-rich environment. These pieces showcase genuine geological artistry, not synthetic treatment.

Photography Note:
Captured under neutral daylight; no color editing or enhancements applied.