Is this an agate?

[fuss]

if so or even if not should I cut it in half? Found in north central WI. It is around the size of a golf ball...I should start adding something to images to show scale.. Thx

 

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[ToddsPoint]

Looks like quartzite to me. Gary

 

[TheOculus]

Definitely Agate! The last picture says it all with distinct "fortification" banding.

 

[CoinFetcher]

Like the last poster said - although examples exist that are much clearer - vibrant - and conspicuous.