Geometrical crystallography before X-rays

Geometrical crystallography before X-rays describes how geometrical crystallography developed as a science up to the discovery of X-rays by Wilhelm Conrad Röntgen in 1895. In the period before X-rays, crystallography can be divided into three broad areas: geometric crystallography culminating in the discovery of the 230 space groups in 1891–1894, physical crystallography and chemical crystallography.

Source: Wikipedia — Geometrical crystallography before X-rays (CC BY-SA 4.0)