Found a cool crystal at an old quarry but have no idea what it is

[Mia2001]

Hi everyone
I'm very new to this and whilst looking round an abandoned quarry near my home in Derbyshire, England, I found this. I would like to seperate the crystal from the rock but I have no idea how, any advice would be amazing

 

[A2coins]

Cnat help you with that but welcome to tnet

 

[SusanMN]

You want to post this on the Rocks and Gem board in the Geological forum where the rock experts hang out.

 

[Professor of Engineering]

Nice find, I hope someone can ID it!