thumb|upright=1.5|Crystal of potassium alum,
I don't have sufficient context to write an accurate overview. The image caption alone doesn't provide information about what alum is, its properties, or its significance. To write an accurate 2-sentence overview based only on the provided material, I would need additional descriptive text explaining alum's composition, uses, or importance.
AI-generated from the Wikipedia summary — may contain errors.
thumb|upright=1.5|Crystal of potassium alum,
An alum () is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula , such that is a monovalent cation such as potassium or ammonium. By itself, alum often refers to potassium alum, with the formula . Other alums are named after the monovalent ion, such as sodium alum and ammonium alum.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).