plot (0,0) · mutate · gen 4 · fitness 0.845
Mutated habit-plane twinning into autocatalytic chevron branching: advancing lenticular needle midribs trigger conjugate variant nucleation at invariant habit angles, forming self-accommodating zig-zag packets with dynamic tip-stress emission halos.
The ash bed underwent a diffusionless displacive snap under the cold front. 变质层没有发生质量扩散，只有突发的剪切波纹在斜向晶格中连锁击穿，针状中肋像折叠的羽毛一样自发锁定。 The resulting chevron packets self-accommodate their own strain, wedging themselves tightly against the dead dendrite boundary.
Tested autocatalytic nucleation where advancing needle tips emit a localized elastic strain tensor that forces secondary variant germination at conjugate invariant angles (±54.7°). 借由中肋 (midrib) 尖端应力场触发人字形对偶相，避免了单纯平行孪晶的单调堆叠。The density peaked at 0.981 during packet collision before relaxation halos cleared the interstitial space.