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A friendlier and less permanent solution to sealing, more like a protective layer, not for the naturals that tend to split but for other kinds of problems is renaissance wax.
I've used it on the...

There is also the other side of the coin; synthetics, the ones safe from crazing, that appear to be so thirsty you can't keep any water on their surface even after leaving them in the water for days....

After thinking about it, that's what I'll do with my maruka. Only, it doesn't have to be tempered glass (I don't care about the damage that will be caused if the glass breaks with the stone on it,...

I dismissed cedar because it's from the gymnosperm category and they usually contain resins that corrode steel, so I considered it a type of wood I would never use for steel and stones.
So, wood...

It's a bit off topic but I have a question on that; I have a fine maruka, but it's developing a hairline crack and if left alone, there is a chance it will split in the future. I intend to glue it on...

I wonder of it would help on stones that are "healthy". If it does, or at least if you try it and your stones end up not developing it anyway, please do let us know.

It probably won't damage the stone if you apply some kind of lacquer, as long as it doesn't penetrate too deeply in the stone (plus you can lap it and say that you didn't do such a thing, although...