I don't know about some of the stuff you have..I guess I may not be familiar with the material.But I do know that Florida sandy soil is highly acidic and the hardstone artifacts that are found hear..like Celts..plummets..gorgets are all ground and retain very visible evidence especially when ground into an edge that would have been used to cut or chop. That stone was a stone long before a native picked it up.It had the same qualities then.that's why flakeable stone was used for the blade type tools. There is flakeable stone where you are so I can't see making a cutting tool out of material that doesn't fit the need.also there is a very complete profile of the archaeological artifacts that have been documented for your area that shows what types of things hardstone was used for.