What kind of mineral is this ?

[Salvatore]

Was wondering if this was quartz or diamond.Has some areas of surface with cubic like shaped on it.On one of the photos there's a large cubic shape and looks to be natural in form.Can send better photos if these are not good enough quality.

 

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[TheOculus]

Looks like Quartzite.

 

[Salvatore]

Thanks for the information and do you think the larger cubic shape is natural and does quartzite form crystals in a cubic shape normally.

 

[Eu_citzen]

Quartzite: Metamorphic Rock - Pictures, Definition & More

As you can see, quartzite is a rock, not a mineral. It doesn't have a crystal shape per se.
However, yours is natural. Don't bother to much about the shape.