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来自维基百科,自由的百科全书
正交晶系,也叫斜方晶系。 該晶系特點是沒有高次對稱軸,二次對稱軸和對稱面總和不少於三個。晶體以這三個互相垂直的二次軸或對稱面法線為結晶軸。α=β=γ=90o;a≠b≠c。非均質性強,具有三個不同的主折射率。
# | 點群 | 例 | 空間群 | |||||||
---|---|---|---|---|---|---|---|---|---|---|
名稱 | 國際標記法 | 熊夫利標記法[1] | 軌形 | 考克斯特符號 | 簡單正交 |
底心正交 |
面心正交 |
體心正交 | ||
16-24 | 斜方楔晶族 (sphenoidal) [2] |
222 | D2 | 222 | [2,2]+ | 七水鎂礬 | P222, P2221, P21212, P212121 | C2221, C222 | F222 | I222, I212121 |
25-46 | 斜方錐晶族 (pyramidal) [2] |
mm2 | C2v | *22 | [2] | 異極礦、矽鈹石 | Pmm2, Pmc21, Pcc2, Pma2, Pca21, Pnc2, Pmn21, Pba2, Pna21, Pnn2 | Cmm2, Cmc21, Ccc2 Amm2, Aem2, Ama2, Aea2 |
Fmm2, Fdd2 | Imm2, Iba2, Ima2 |
47-74 | 斜方雙錐晶族 (bipyramidal) [2] |
2/m2/m2/m(=mmm) | D2h | *222 | [2,2] | 橄欖石、霰石、白鐵礦、黃玉、金綠寶石 | Pmmm, Pnnn, Pccm, Pban, Pmma, Pnna, Pmna, Pcca, Pbam, Pccn, Pbcm, Pnnm, Pmmn, Pbcn, Pbca, Pnma | Cmcm, Cmca, Cmmm, Cccm, Cmme, Ccce | Fmmm, Fddd | Immm, Ibam, Ibca, Imma |
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