Natural crystal or manmade glass?

[FriscoT06]

Was digging a resting place for a cardinal I found in my yard, and I found this crystal in the hole! It's very clear with minimal inclusions like glass, except for three larger pieces that appear iron, but are nonmagnetic, but it has an outer crystalline structure unlike glass, but just like crystal. Nothing else manmade in the red clay hole. Slag glass or quartz crystal or somethin space-y, thoughts?

 

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[pepperj]

Looks like a natural crystal, nice find.

 

[Johncoho]

I agree it looks like a natural crystal. We hunt for crystals like that in Payson, Az and it looks like what we find.

 

[austin]

Natural, natural, natural. Yippie...