STONE id help please

[botrafis]

Hello,
Few years ago this stone was found in sands in a trip to north africa. This stone broke few years ago so a piece of it is missing.
what do you think it is ?
of the 2 pic show the interior after it broke
Thanks for help!

 

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[ticndig]

It looks like Quartz to me.

 

[tamrock]

Quartz is my thought also. Being broken now more than likely will effect the value I'm thinking.

 

[botrafis]

thanks!!