7 crystal

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  • The seven crystal system
    • Axial distances
      • a=b=c
        • CENATrigonal(a=b=c!90)(P)
          • Ex-Calcite,cinnabar
        • Cubic(a=b=c=90)(PFB)
          • Ex-Diiamond,Cu,Zn blende,NaCl
      • a!=b!=c
        • MoNaclinic(a=c=90b!90)(PE)
          • Ex-Na2so4.10h20,mono sulphur
        • CABAKNOOrthorombic(a=b=c=90)(PFEB)
          • Ex-Rh.sulphur,
        • Di(tri)cunic(a!b!c!90)(P)
          • Ex-K2cr2o7,H3BO3,Cuso4.5h20
      • a=b!=c
        • CDSHexagonal(a=b=90c=120)(P)
          • Ex-CdS,ZnO,Graphite,Mg
        • CASOTetragonal(a=b=c=90)(PB)
          • Ex-CaSo4,tin&ti compound
  • a=b!=c
    • CDSHexagonal(a=b=90c=120)(P)
      • Ex-CdS,ZnO,Graphite,Mg
    • CASOTetragonal(a=b=c=90)(PB)
      • Ex-CaSo4,tin&ti compound

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