This books aims to highlight on physical and optical properties of REEs-RM-bearing minerals and their economic aspects in strategic industry. In addition , it gives rise to detect the main sites enriched with REEs-RM in alkaline and peralkaline rocks in ANS of Saudi Arabia and Egypt. Also, it provides us many colored microphotographs of the most common minerals enriched with REEs and RM. It is strongly urgent to be benefited for B.Sc. Geology students and Junior geologists.