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enter image description here The rock has green,purple and white stripes.

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  • $\begingroup$ Welcome to the site. Please review our rock identification guidelines to provide the missing information so that your question is both answerable and useful to new users. $\endgroup$ – user12525 Jul 18 at 19:22
  • $\begingroup$ A better picture is also welcome - this one seems to be shot under bad light conditions, or it is enlarged too much. $\endgroup$ – Jan Doggen Jul 18 at 20:19
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It looks as though it could be a specimen of blue john, an unusual mineral from which a large variety of ornaments are made. In England there is a famous mine in Derbyshire which has a factory for making ornaments and a shop which sells them to visitors. English blue john is said to be the finest. I'm not sure where your specimen came from. There are some yellowish tints in English blue john. which can be turned and polished on a lathe.

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