René-Just Haüy



  He was a French mineralogist who discovered the basic laws of crystallography. He used this approach to demonstrate that the crystals of beryl and emerald are geometrically equivalent, leading to Vauquelin’s proof that they were chemically identical.



  1. Photographs of Paris, France, ParisD

Copyright 2018, Dr. James L. Marshall and Virginia R. Marshall
All Rights Reserved.