The book "Micro Testing (XRD SEM & Petrography) for Clayshale Layer, Indonesia" is aimed at educators, students, and researchers in the field of civil engineering who are involved in the study of clayshale in Indonesia. Given the numerous infrastructures built on these layers, it is crucial to understand the stability of these layers, as they can lead to landslides and instabilities over time, affecting the underlying soil foundation and the infrastructures above. This book provides valuable information and is intended to serve as a foundation for similar research projects in other countries that also face clayshale layers. It aims to develop future research to create tools and methods that clarify important parameters of clayshale for the engineering planning of infrastructures. The work represents a partial success of the research and will be continuously improved.