Intercepts of crystal face DEF in ångstroms, on a, b, and c axes, measured from origin.
OD 20 Å
OE 10 Å
OF 40 Å
If b intercept is made equal to 1 the axial ratio is obtained for the crystal.
20 10 2
10 10 :1
40 10 :4
Indices are obtained by dividing the intercepts of face DEF into those of the parametral plane, which is a face of the unit form with intercepts (111).
Miller's indices of face DEF are obtained by removing fractions.
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