Of course it has! The length of your ownership isn't a statistical blip in its life. The Ardennes area gets plenty cold. There are a few guys that spent a very cold and bloody Christmas there 70 years ago that could testify to that.
Printable View
Without seeing the crack up close and personal it is hard to say, but I would bevel the edges and just see what happens. My guess is you'll be fine with the crack glued as is.
If it was bought from a Vendor, I'd return it. They will gladly replace it!
No it wasn't from a vendor. I bought it from a store.
I'm not a student of geology, but I'm under the impression that these metamorphic rocks were formed over ages and ages of layers of dust, minerals, and the like settling on the surface and getting deeper and deeper. Eventually weight and pressure pressing the conglomeration together forming the rock that we know today. Extremes of heat and cold contributing to the melange. One of the reasons for the variability of the natural hones. Correct me if I'm wrong, this is only my impression from the scant reading I've done on the topic.
No, I didn't misunderstand. The issue is the crack. That can be caused by stresses latent in the rock itself. Those stresses can be temperature induced and present long before it was quarried. Just because you didn't expose it to any "extremes" doesn't mean that the rock has lead a "sheltered life." Realistically it was exposed to stressors beyond our ability to appreciate. Unfortunately in your piece, they are now just revealing themselves.