The rock has green,purple and white stripes.
closed as off-topic by arkaia, Jan Doggen, Semidiurnal Simon, Universal_learner, Gimelist Jul 19 at 10:46
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Please review our rock identification guidelines to provide the missing information so that your question is both answerable and useful to new users." – arkaia, Jan Doggen, Semidiurnal Simon, Universal_learner, Gimelist
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.