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Cubic, 1 h2 + k2 + l2 (4.3)
Rhombohedral, dc2 =
a2

11 sin2α + 2 (hk + kl + hl) cos2α – cosα
d2 = dc2 1 – 3cos2α + 2cos3α
Tetragonal, (4.4)

Hexagonal, 1 h2 + k2 l2 (4.5)
d2 = a2 + c2

1 4 h2 + hk + k2
d2 = 3 (4.6)
a2

Orthorombic,

1 h2 k2 l2 (4.7)
d2 = a2 + b2 + c2

Monoclinic,

1 h2 k2sin2β l2 2hlcosβ csc2β (4.8)
d2 = a2 + b2 + c2 – ac

Triclinic,

1 A+B (4.9)
d2 = C

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