I make no claims as to being a mineral expert but I believe these specimens are fluorite mixed with calcite or some other mineral (dolomite?). They were found with Cyclonema sp. snail fossils in Franklin County, Kentucky. The layer should be the Lexington Limestone of the Ordovician Period.
The majority of the fluorite is yellow but one has a small section of purple. I find it unique as typically think of the fluorite areas of the state of Kentucky to the western part near southern Illinois.
Mindat.org lists fluorite, calcite, and dolomite as all being found in Franklin County, Kentucky.
Mike, You could try to confirm it as fluorite by putting some Vinegar on it to see if it fizzes. If that is Fluorite that is a neat occurrence.
ReplyDelete-Dave