This document is from the Faculty of Engineering at Gadjah Mada University regarding a practical laboratory session on crystallography and mineralogy. It was prepared by Adnan Hendrawan for his class on Mondays in room 1A/II. The assistants for the laboratory session were Arnissyya Oldestya Diamantha, Yan Restu Freski, Robertus Herdiawan Suparna, Dany Mardiati, Ega Gita Prasastia, and Muhammad Destrayuda Trisna. The session took place in Yogyakarta in September 2013.