What rock is this?

[bushbabykatie]

Hello, I got given this rock by a family member. It's from Thailand, which is where they also bought it. It's a heavy rock, with a greeny/blue colour and it is extremely sharp all over. I've looked on the internet but can't identify it myself, so I was wondering if anyone else knew what is was? Thank you

 

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[bushbabykatie]

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[Treasure_Hunter]

Looks like coral.

 

[capt-zero]

It kinda looks like a form of copper sulfate. Lick it, if it is, you'll never forgive me.