I asked indeed for something rocky for this Earthday exchange, and I got it. Santa lives in an area with some amazing geology and lives at the type location for natrolite, a rather obscure fibrous hydrated sodium and aluminium silicate. Wow! And even nicer: there's a castle on top. Thanks a lot dear Santa, I could not have hoped for more for this exchange. I've now added this location to my list of 'places that I really need to visit' even though it's not really around the corner for me. Again, thanks for these fab photos.
RocksRock