Not sure what category of error this quarter falls under

[Autumn-]

Hello,
Doing some coin roll hunting and came across this 2000 D Virginia quarter. Strike error? Defective planchet? Something else? I've looked and haven't been successful in finding one like this. My knowledge base isn't great as I haven't been doing this long, just learning as I go. Any input would be welcomed. Thanks!

 

[l.cutler]

Are you sure it isn't just glue or something like that? That is what it looks like.

 

[Autumn-]

Sorry, you think I would have caught that I've run across that before but even looking under the microscope I didn't recognize it. This is why I need to ask those who are much wiser than me to point out the obvious. Thanks for taking the time!

 

[dejapooh]

PMG
Post Mint Gunk.

 

[galenrog]

PMG
Post Mint Gunk.

Yep.

Time for more coffee.