Question: Can you determine the acidic character of a rock ? And if it's possible, how do you do it ?

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  1. Hi!
    I’m not an expert, so maybe Bas (who is a geologist) can give you a better answer. But I can try…
    As far as I know, rocks which contain a lot of silica have a more acidic character. Igneous rocks (those that form when magma or lava cool and solidify) generally have lighter colours when they have a high silica content (and a more acidic character).
    I’m not sure if there is a specific test for this that you could do in the lab, but my guess is that silica content and colour are used to define it.