Granite is composed of primarily quartz, feldspar, and mica and sometimes olivine or other minerals in small amounts. The key to it is the rate of cooling. Fast cooling results in obsidian type of material with little to no crystal structure, with the other end of the spectrum being very slow cooling forming large crystals as in pegmatite. Slow cooled granite is where you get large quartz crystals, etc.
If there was some way early man accomplished this melting and forming of granite, the evidence seems speculative. Huge fresnel lenses back then seems pretty speculative, as glass does not decay so any remnants would likely have been discovered as old glass in situ is present in ancient civilizations, but almost no flat sheets or parts of them are present in the early deposits. Windows came along later. Mirrors could have been highly polished bronze. The pharaohs would have wanted anything significant buried with them for their next lives, so the absence is probably sigificant.
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