A rare mineral consisting of aluminum sulfate and water, which forms when alum-rich rocks are exposed to weathering and moisture.
From Latin 'alumen' (alum) and Greek 'gen' (to produce/generate); literally 'alum-producer' because it forms from the breakdown of alum-bearing minerals.
Alunogen is like watching chemistry happen in real-time on rocks—it's what appears when water and air slowly dissolve alunite, creating delicate crystals that miners use as a sign of where to find better mineral deposits.
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