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Did it have an empty smile?

I would not touch this hone with any DMT higher than 220. You risking that the hone will take your diamonds off.

Air cooling is ok just dont throw it outside if you live in Alska:gl:

You need to be slow on heating up and cooling down this stone. They are prone to micro-cracking/flaking

Only one thing can be safely assumed in world of natural hones and that is that they differ from each other. Apart from that one could expect that it should be finisher.

LI. Just tap on one side of the box ans slowly it should come out. Otherwise suspend it in oven upside down. Keep newspapers under it and it will fall out.