We are looking at granite 3CM thickness on our cabinets and looking at a bar area that will use glass block as support for the overhang. My question is can the glass block wall support this kind of weight which will be about a overhang of 12" and 64" long.
Thanks

You shouldn't bear weight on glass block, it is not load bearing. Is the bar overhang directly behind the cabinets so it is one big counter or is this a separate bar? If so it could be cantilevered or supported in some other manner.