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Granite often contains other minerals, such as hornblende and mica, and appears in a variety of colors, including: brown, green, red and the common black. Because it crystallizes so slowly, its crystals intertwine one by one like a Rubik's cube.
After a long period of natural aging, the structure of the rock is uniform, the coefficient of linear expansion is very small, the internal stress is completely disappeared, and there is...
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21 2025-01 
21 2025-01 
