Cup‑Shaped Hollow Calcite From Phong Nha-Ke Bang, Quang Binh, Vietnam.

Dimension: 7.1x10.4x6.4cm.

This unique hollow cup‑shaped calcite forms in karst caves that remain permanently submerged by groundwater. In mineral‑rich, calcium‑saturated water, crystal edges grow faster with constant access to fresh mineral‑laden flow, while growth slows at the stagnant, nutrient‑depleted core — gradually creating its hollow cup structure. Underwater, the calcite naturally develops its rhombohedral crystal habit, forming angular triangular clusters free from air‑related disturbances. Slow, gentle underwater crystallization minimizes impurities, resulting in its warm golden, translucent appearance.

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酒杯形空心方解石产自：越南广平省丰芽-格邦 

尺寸规格：7.1×10.4×6.4cm.

这种独特的空心酒杯状方解石，诞生于溶洞长期被地下水淹没的稳定环境中。在富含碳酸钙的饱和水流里，晶体边缘因持续接触新鲜矿水而优先生长，中心区域水流停滞、养分耗尽生长放缓，久而久之便形成了中空的酒杯形态。方解石本身的菱面体晶习，在纯净的水下环境得以完整展现，生长出棱角分明的三角晶簇。缓慢温和的水下析晶过程大幅减少了杂质混入，最终造就了它金黄通透、质感温润的独特外观。

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