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The 29 pages that link to Crystal polymorphism, each with the reason it gives.

• Crystal structureRelated: Different arrangements of the same substance can produce distinct material properties.

• Calcium carbonateRelated: Calcite and aragonite show how one formula can form distinct crystal structures.

• MineralRelated: Different structures can produce distinct minerals from the same chemical formula.

• AllotropyCompared with: Polymorphism concerns a substance’s crystal forms; allotropy concerns forms of an element.

• Cocoa butterRelated: Cocoa butter crystallizes in several forms, but only one gives well-tempered chocolate its desired qualities.

• Titanium dioxideNarrower topic: Titanium dioxide’s polymorphs have different optical, catalytic, and stability properties.

• CrystallinityRelated: Different crystal forms can have different properties despite similar degrees of crystallinity.

• AragoniteRelated: Aragonite and calcite are distinct structures with the same chemical composition.

• Carbonate mineralRelated: Calcium carbonate forms both calcite and aragonite, which have different crystal structures.

• Manganese dioxideRelated: Different MnO₂ polymorphs have distinct structures despite sharing the same chemical formula.

• Molecular structureRelated: Different solid-state arrangements of the same molecules can change material properties.

• Isomorphous substitutionCompared with: Polymorphism changes structural arrangement, whereas isomorphous substitution preserves a host structure.

• Crystal twinningCompared with: Polymorphs differ in structure, whereas twin parts belong to the same substance and structure.

• AnataseNarrower topic: Anatase, rutile, and brookite are polymorphs with different atomic arrangements.

• Vanadium(V) oxideRelated: V₂O₅ can occur in distinct structural forms with different material properties.

• Allotropes of sulfurRelated: Several sulfur allotropes differ mainly in how S₈ molecules pack into crystals.

• PhaseBroader topic: A material’s crystal polymorphs are distinct solid phases with different properties.

• SillimaniteNarrower topic: Sillimanite illustrates how one composition can form distinct mineral structures.

• BrookiteNarrower topic: Brookite, anatase, and rutile are structurally different forms of the same compound.

• EnstatiteRelated: MgSiO₃ adopts several structures, including enstatite, depending on conditions.

• KyaniteRelated: Kyanite shares its composition with two minerals that have different crystal structures.

• Boron nitrideNarrower topic: Boron nitride is a clear case of one composition adopting sharply different crystal structures.

• Crystal engineeringRelated: Different packing arrangements can give one compound distinct crystal forms and properties.

• Mercury(II) oxideRelated: Red and yellow HgO are associated with different structural forms.

• AllotropeCompared with: Polymorphism describes a related structural phenomenon, often used for compounds rather than elements.

• Plagioclase feldspar solid solution seriesRelated: Contrasting with solid solution: same composition, different structures instead of one structure, varying composition.

• Silicon nitrideRelated: Silicon nitride’s alpha and beta forms are crystal-structure variants.

• Serpentine subgroupRelated: The principal serpentine minerals share similar chemistry but differ in structure.

• Tricalcium phosphateRelated: Tricalcium phosphate has distinct alpha and beta crystal forms with different stability and reactivity.