what is this mineral?

[1bear]

Hello from Scotland

I would be grateful if you could help to identify this small mineral.(found on the sea shore)
Thanks

 

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[Red James Cash]

Looks like milky quartz.

 

[phishisgroovin]

agate

 

[phishisgroovin]

looks exactly like this one i found awhile back.
i made a ring out of it, click link below
http://www.treasurenet.com/forums/rocks-gems/329735-what-kins-stone-opal.html

 

[HammerHead]

Looks a bit like Selenite but I am not 100% sure