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like a frozen geometric sanctuary that captures the traces of mineral growth over time
with distinct stepped skeletal growth striations clearly visible across all crystal faces
Dimension : 11
微晶皮壳状石英沿萤石晶面、晶缝外延共生，堆叠形成立体错落的共生晶簇结构；部分晶面点缀微量氧化铁浸染斑点，增添标本原生自然肌理。
Cup‑Shaped Hollow Calcite 5 US Showroom like a frozen geometric sanctuaryCupShaped Hollow Calcite From Phong Nha Ke Bang, Quang Binh, Vietnam. Dimension: 6. 7x9. 8x8. 7cm This unique hollow cupshaped calcite forms in karst caves that remain permanently submerged by groundwater. In mineralrich, calciumsaturated water, crystal edges grow faster with constant access to fresh mineralladen flow, while growth slows at the stagnant, nutrientdepleted core gradually creating its hollow cup structure. Underwater, the calcite
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