単斜晶系






単斜晶系の例：正長石


単斜晶系（たんしゃしょうけい、英: monoclinic crystal system）は、7つの結晶系の1つ。対応するブラベー格子は、単純単斜格子・底心単斜格子の2種類。


結晶系は、3つのベクトルで表現できるが、単斜晶系では、直方晶系のように異なる長さのベクトルで表される。これらのベクトルは、底面が平行四辺形の直角柱を形成する。従って、2組のベクトルが直角に交わっているが、3つ目の組は90°にならない。




目次






  • 1 ブラベー格子


  • 2 結晶の分類


  • 3 元素


  • 4 出典





ブラベー格子


単斜晶系には、単純単斜格子と体心単斜格子の2つのブラベー格子が存在し、格子の形はそれぞれ長方形とひし形である。





















単斜晶のブラベー格子
名前
 単純
 底心

ピアソン記号
 mP
 mC

単位胞
Monoclinic.svg
Monoclinic-base-centered.svg


結晶の分類


単斜晶系結晶の例、シェーンフリース記号、ヘルマン・モーガン記号[1]、点群、オービフォルド記号、タイプ、空間群が以下の表に掲載されている。














































#
 点群
 タイプ
(例)
 空間群
分類
Schoen.
Intl
Orb.
Cox.
3–5
 Sphenoidal [2]
 C2
 2 {displaystyle 2 }{displaystyle 2 } 22 [2]+
 enantiomorphic, polar
(鉄明礬)
 P2, P21
C2
6–9
 Domatic [2]
 C1h (=C1v = Cs)
 2¯=m{displaystyle {bar {2}}=m}{displaystyle {bar {2}}=m} *11 [ ]
 polar
(ヒルガーダイト)
 Pm, Pc
Cm, Cc
10–15
 Prismatic [2]
 C2h
 2/m{displaystyle 2/m,!}{displaystyle 2/m,!} 2* [2,2+]
 centrosymmetric
(石膏)
 P2/m, P21/m, C2/m
P2/c, P21/c, C2/c


元素


元素硫黄も単斜晶系結晶になる[3]。



出典





  1. ^ Prince, E., ed (2006). International Tables for Crystallography. International Union of Crystallography. doi:10.1107/97809553602060000001. ISBN 978-1-4020-4969-9. 

  2. ^ abc“The 32 crystal classes”. 2008年9月19日時点のオリジナル[リンク切れ]よりアーカイブ。2009年7月8日閲覧。


  3. ^ C.Michael Hogan. 2011. Sulfur. Encyclopedia of Earth, eds. A.Jorgensen and C.J.Cleveland, National Council for Science and the environment, Washington DC



  • Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., pp. 65 – 69, ISBN 0-471-80580-7



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