Microcline is a type of feldspar mineral that is known for its characteristic perthitic twinning. Perthitic twinning occurs when two crystals of microcline grow together, with one crystal rotated 180 degrees relative to the other. This results in a distinctive interlocking texture in the crystal, with alternating layers of different orientations. The two intergrown crystals are typically of different colors or have different optical properties, which makes the perthitic twinning easy to recognize under a microscope or by eye.
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