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Actually there are many possibilities around which do go from classical natural sealing with shellac or Urushi Laquer (mostly done on Jnats)...i prefer synthethic clear coating.

For Jnats check...

Especially on slates there is a easy procedure to check if a Sealing might be useful...make the area where you want to check the condition wet...then directly dry it with a towel...

Now check how...

I would say its a slate...i own several slates like this. Actually its difficult to point out the origin of any of those.

Mottled slate appears in many different regions of the world...

Iam...