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Acrylic or mineral repair

Chief
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Chief

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I'm looking to repair the crystal on my current citizen project. I've seen a brilliant guide on here as to repairing acrylic crystals, but I'm wondering, is my crystal acrylic or mineral? What's the difference with regards to repairing? Can I sand and polish a mineral crystal in the same way I would an acrylic crystal? Added pics of crystal if it helps with identification.  

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