Identifying help needed please.

[PennyG]

Finding a bunch of this stuff buried about four feet down. I know it's a common find ( I think) but can't recall name. Some is heavy and some is light and flakes easily.

 

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[Eu_citzen]

Flint? The image is kinda hard to tell from.

 

[PennyG]

I forgot I posted this pic. And posted more under a new topic. But a cleaned up version.