If we want to study the crystal structure in diffraction techniques, then why do we use the powdered form of material rather than the crystalline form?

From: X-ray Powder Diffraction (XRD)

By scanning the sample through a range of 2θangles,  all possible diffraction directions of the lattice should be attained  due to the random orientation of the powdered material. Conversion of  the diffraction peaks to d-spacings allows identification of the mineral  because each mineral has a set of unique d-spacings. Typically, this is  achieved by comparison of d-spacings with standard reference patterns.

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