Can anyone identify this rock

[BootedAngel]

I found this today in northeast Arkansas, just wondering what kind of rock it is. Thank you!

 

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[TheCannonballGuy]

Noting in particular your rock's "fracture" characteristics, I believe it is one of the many variations of Chert. I should mention, when trying to correctly identify the mineral content of a rock you've found, it is helpful to take into account the BASIC type of rock (Igneous, Metamorphic, or Sedimentary) which is the bedrock in the location where you found your unknown rock. Chert is a Sedimentary rock, and the bedrock of NE Arkansas is Sedimentary.

Chert is most often found as an "inclusion" (nodules, or beds) in Limestone,

The photo of a Chert specimen below is from the Wiki page of Chert varieties. As the photos show, Chert can come in many colors... but the most common is medium-to-dark grey, which typically "weathers" to light-grey or white on the outside of the nodule or bed. For example, Flint nodules are a version of Chert. You'll see examples of both the nodule and bed forms here:
https://www.bing.com/images/search?q=Chert&FORM=IARRTH&ufn=chert&stid=96d61b9f-21b8-e9c6-a976-d4e1e8d8189a&cbn=EntityAnswer&cbi=0&FORM=IARRTH