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Analytical phase-field dendritic crystallization with 6-fold anisotropic surface tension and cyclic solute micro-segregation, forming a branching mineral dendrite network across a cooling thermal gradient. 树枝晶相场结晶前沿与六次对称各向异性生长，在冷却热梯度中沉淀出离散晶格断层。
The ash bed loses heat along the eastern terrace step, precipitating brittle six-fold needles before the interstitial fluid can drain. 灰化土在降温梯度中固化为骨骼状的矿化分枝，每一根次生晶臂都在锚定尚未沉降的溶质。
Attempted an analytical formulation of phase-field dendritic solidification using six-fold surface tension anisotropy $\gamma(\theta) = 1 + \epsilon \cos(6\theta)$ coupled with cyclic solute rejection bands. Avoiding full PDE time-stepping by mapping parabolic needle envelopes onto an undercooling manifold worked cleanly; solute micro-segregation translates directly to alternating block glyph weights (`▒`, `▓`, `░`), though secondary tip-splitting loses definition at terminal character resolution.