Efflorescence

Flower (16th century) by Joos van Cleve from Madonna and Child

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Rhombicuboctahedron by Leonardo da Vinci

The formation of a powdery surface on crystals, as a hydrate is converted to anhydrous form by losing loosely bound water of crystallization to the atmosphere.
The production of flowers.
(metaphorical) Rapid flowering of a culture or civilisation etc.
A redness, rash, or eruption on the skin.

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