Etymology:
The word "macle" is derived from the Old French word "macle," meaning "club" or "mace." It is ultimately derived from the Latin word "macula," meaning "spot" or "stain."
Meaning:
In crystallography, a macle is a twin crystal in which two individuals are intergrown symmetrically so that they form a characteristic pattern or shape. The twinning plane is typically perpendicular to the direction of symmetry.
Origin:
The concept of macles in crystals was first described by the German crystallographer Johann Friedrich Christian Hessel in 1830. Hessel observed that certain crystals exhibited characteristic patterns and shapes that could be explained by the presence of twinning.
Hessel's work laid the foundation for the study of crystal twinning, and the term "macle" became widely used to describe these symmetrically intergrown crystals.
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