Cracked granite countertop
I picked out my 2 slabs of giallo napoleone at Daltile, and I negotiated a rate of $45/sq for 65 sf from a fabricator. I was in Lowe's today with a sample of the granite, looking at sinks, when their countertop people started to pitch me their services. They asked: What are you going to do if 2 weeks after your granite is installed, you develop a crack? They said that neither the fabricator nor the granite yard would "guarantee" or repair/replace the countertop.
My questions are :
1) Can a granite countertop spontaneously crack and if so, does this represent an installation error?
2)The fabricator wants a check for 50% up front (which I figure covers all of the cost of the slab and part of the labor.). If he breaks the granite while installing..what does he do?
3) Do I get to keep the extra granite if I want?
Thanks in advance!