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If it's quartz and mica it ain't granite. Feldspar is a main ingredient in all granite. The types of feldspar vary and granite can have several other igneous rocks mixed in too. Like all rocks there...

Granite is composed (usually) of three things: Quartz, Feldspar and Mica. The hardness of the three vary tremendously and the distribution of these minerals is totally chaotic. So, if you used a...