Does anyone know what this could be?
Looks like rhodochrosite
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Looks like Lepidolite to me. A Lithium rich member of the mica group.
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I agree with clarkoe looks like a mica mineral, try taking a very small shaving of it use a strong magnet to see if it has any reaction , all the other micas except Lepidolite contain Iron.
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Thanks I’ll give the magnet a go and let you know.
Sorry, Should ha ve bee n manganocalc ite