原始晶胞(Primitive cell),或稱基本胞,簡稱原胞,是單位晶胞(Unit cell)的一種,在幾何固體物理礦物學上,特別是描述晶體結構時,為具有二維、三維或者其他維度平移對稱性的簡單點陣結構的最小單元。原始晶胞是體積最小的晶胞,只佔用一個晶格點。我們可以用晶格原胞的幾何結構來對晶格進行分類。

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