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Cobblestone can be made from many different types of stones but the most common ones, by far, are granite, basalt, limestone, and sandstone.  If you are laying a brick paver patio or other such project, the medium is different. It’s rare, but cobblestone can also be made from marble, slate, jasper, and other types of rock. Technically, you can make cobblestone from almost any type of rock, but if it is weather-resistant and stands the test of time is another question entirely.

Rock salt and ice melts contain sodium chloride, aka salt, and are corrosive to metal and concrete. If used frequently over time, it can cause corrosion, discoloration, chipping, and cracking to patios, walkways, and driveways. You can try a rock salt alternative or hire a professional snow removal company instead. 

Some cracking in bricks is normal, such as when a foundation settles. Keep a watchful eye though, and alarm bells should start ringing if new cracks appear or existing cracks lengthen or widen. Temperature changes, moisture, and structural loading can all contribute to cracks in bricks either starting or getting worse.

It is possible, albeit a lot slower, to break up a rock using water. You would do this by freezing and thawing the water. You could create some initial holes or cracks in the rock, then pour water into the cracks or holes and allow them to freeze (so it's best to do this in winter or in colder climates). Since water expands when it freezes, this puts pressure on the inside of the rock and causes it to crack. You could continue to pour more water in and let it freeze to continue to break up the rock.