Resources written by Chas McCaw for sixth form chemistry teaching and beyond.
General interest:
Graphite Buckminsterfullerene Ice White phosphorus Benzene Cyclohexane AdamantaneCubic:
Sodium Caesium chloride Polonium Copper Halite Fluorite Antifluorite Zinc blende DiamondNon-cubic:
Hexagonal:
Magnesium WurtziteTetragonal:
RutileTrigonal:
α-quartzTriclinic:
Copper(II) sulfateOrthorhombic:
α-SulfurMonoclinic:
β-SulfurSince the geometry around the zinc ions is tetrahedral, the structure can be represented as a three-dimensional array of corner-sharing tetrahedra. The structure to the left shows the tetrahedra of sulfide ions around each zinc ion. The tetrahedra are coloured grey as they have a zinc ion at their centre. Note how there is an AB pattern in the layers of tetrahedra and a defined axis, analogous to the hexagonal close-packed system on which the lattice is based.
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