Granite? Who crazy would come up with the idea to build pyramids with something as heavy and hard as granite.<p>They were not even carved out of limestone blocks, they were casted by an early form of concrete created using a mixture of limestone, clay, lime, and water. Similar to how they would have been built nowadays.
<a href="http:&#x2F;&#x2F;www.livescience.com&#x2F;1554-surprising-truth-great-pyramids-built.html" rel="nofollow">http:&#x2F;&#x2F;www.livescience.com&#x2F;1554-surprising-truth-great-pyram...</a>