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Actually, quartz is one of the last minerals to cool under the surface. Because of this, the quartz tends to fill in all of the empty spaces in the solidfying magma, causing it to often come out in flakes, or oddly shaped chunks. Not all igneous rocks cool slowly, and this factor is just dependent on whether or not the rock is intrusive (still under ground) or extrusive (above or near the surface). Because obviously if a rock is underground, with all of the hot magma, it is going to take thousands of years for it to cool completely. While the air of the atmosphere that humans live in is way cooler than underground, so obviously it is going to take less time to cool it. So in closing, it just depends where the quartz is at in the Earth's crust. But, if it is in the Earth's crust, it usually is one of the last minerals to cool, making quartz unique.

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13y ago

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