A mineral composed of hydrated copper silicate that forms in oxidized copper deposits.
From Greek 'a-' (without) + 'kardia' (heart), referring to its lack of a central crystalline structure, combined with the mineral suffix '-ite'.
The name 'acardite' is actually a misnomer—it was named by early mineralogists who thought it had no distinct core, but later study proved them wrong. It's a great example of how scientific names sometimes stick around even when we learn the original reasoning was incorrect.
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