Think it is amethyst, not certain. also odd rock.

[BC1969]

Hey there going through my collection and I'm not sure if this is a amethyst or something else purple. plus a granite ? sandstone combo.
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Mike

 

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[DDancer]

Yep a nice chunk of amethyst with a bit of somewhat clear quartz. Second bit is right for your identification. Some point in time the granite was covered by sediment and formed a sandstone/granite boundary piece.