Polygonal Cracked Granitic Boulder in Yakushima, Japan: Pore Size Distribution and Genesis of the Boulder

A unique polygonal cracked granitic boulder, known locally as 'kameishi' or 'kameiwa,' has been studied for its pore size distribution and formation process on Yakushima Island, Japan. This study reveals that the boulder's distinctive pattern is influenced by weathering processes, particularly the expansion of pores within the granite structure. Researchers analyzed the boulder's characteristics in comparison to similar formations worldwide, providing new insights into its genesis. The findings contribute to a deeper understanding of granitic rock weathering and the formation of such geological features.

FUJII, Y., TAKAHASHI, M., & SATO, M. (2016). Polygonal Cracked Granitic Boulder in Yakushima, Japan: Pore Size Distribution and Genesis of the Boulder. Journal of the Japan Society of Engineering Geology, 57(5), 193–200. https://doi.org/10.5110/jjseg.57.193