All minerals should be naturally occurring. Naturally occurring means that the minerals cannot be made in mineral making factories which means that they cannot be man made. Minerals have to form over time. If you buy a "mineral" in a toy store it is most likely not an actual mineral because it could have been made in a factory.
This is an image of a synthetic diamond. It has been made by a factory which means that it is not naturally occurring. This diamond is not a mineral because it was made in a factory.