Lorsque'en 1960, j'ai redige la preface du premier volume de I'ouvrage sur les minerais Uraniferes Francais et leurs Gisement's, et que j'avais ainsi le tres grand plaisir de presenter aux lecteurs, dans le cadre de la bibliotheque des sciences et Techniques Nucleaires, un auvrage mettant a'la disposition de tous les geologues et mineralogistes les …
The rapid growth of gemological sciences and mineralogy requires a comprehensive dictionary for gemologists,mineralogists,geologists,jewel dealers ,industry and hobbyists .the second edition of this dictionary contains about 25000 entries-about 9000 more than the first edition.the comprehensive ,definitions are now completed by more than 1500 charts…
Sandstones from the backdrop to some of the world's most spectaculer scenery-forming high mountain ranges, bold cliffs, extensive plateaus,impressive caverns and magnificent towers. They are found all over the planet and in all climates, from hot deserts to the polar region, and provide the contruction material for iconic bulidings in numerous count…