Baddeleyite (ZrO2) is widespread in lunar basalts and frequently used for U‐Pb geochronologyof magmatic and impact events. The formation of baddeleyite involves two primary mechanisms: (a)crystallization from late‐stage magma, and (b) decomposition of zircon under high‐temperature (high‐T) conditions. Baddeleyite with distinct formation mechanisms commonly displays different morphologies.In a Chang'e‐5 lunar basalt, we report baddeleyite with two different morphologies, termed “singular type”and “aggregate type.” Petrographic and crystallographic analyses were conducted on both types ofbaddeleyite to understand their formation conditions and evolution processes. Despite the similarity in themorphology and mineral assemblages between the aggregate type baddeleyite and zircon decompositionproducts, the petrographic characteristics and the rarity of zircon in lunar basalts tend to suggest that bothtypes of baddeleyite are derived from magma crystallization. Crystallographic relationships observed in bothtypes indicate a phase transformation from the precursor tetragonal‐ZrO2/cubic‐ZrO2 or orthorhombic‐ZrO2phase. Two potential scenarios are proposed for the formation of these microstructures: (a) directcrystallization of high symmetry ZrO2 from magma, and (b) crystallization of baddeleyite from magmafollowed by a high‐pressure (high‐P) event causing its phase transition. However, due to unresolvedscientific issues in both scenarios, an accurate evolutionary process cannot currently be determined.Therefore, extensive thermodynamic experiments are necessary to enhance our understanding of baddeleyitemicrostructures as indicators of P‐T processes, providing insights into magmatism and the impact history ofplanetary bodies.