Basaltic rocks existing at Crater Lake in contact with water or submerged in water were found to be covered by a white layer on their surface. The authors of this paper, while studying Lonar Crater Lake formation came across these rocks covered by a white layer. A search was conducted to understand the true nature of this phenomena. They discovered the reason, why these rocks or stones became white and what is the material or component that deposits white layer on the rocks existing in the lake periphery and whether this phenomena is of biological, chemical or physical in nature, has been reported through this paper.