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Unknown mineral

General rule of thumb, applies to everything in life, not just CP's! ;)

"If you don't know what it is, don't use it!"

Looks like crushed coral to me. here is the pic again.


Here is some crushed coral.


I don't know if it is OK for pings though.
Put some in vinegar. If it fizzes and/or dissolves it might be coral or limestone. Either of which when well rinsed should be ok for Mexican Pinguicula. I'd mix some sand into it.