所謂面角晶面法線間的夾角。它在數值上等於相應晶面實際夾角的補角(即180°減去晶面實際夾角)。晶體在生長過程中,往往由於外界客觀環境的影響,造成形態上發生不同程度的畸變,從而形成歪晶。但是,無論晶體形態上如何變化,同種晶體間,對應晶面夾角恆等。這就是面角守恆定律。

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