History of crystallography before X-rays

The history of crystallography before X-rays describes how crystallography developed as a science up to the discovery of X-rays by Wilhelm Conrad Röntgen in 1895. The scientific approach to the study of crystals began in the 17th century with the work of Kepler on the structure of snowflakes and Nicolas Steno's discovery that the angles between corresponding faces in a crystalline substance are always the same.

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