Student Use of Thin Sections in Introductory Geology

Abstract

An adequate understanding of the mineral basis for rock classification is difficult for students to achieve in an introductory geology course. In studying fine-grained rocks where minerals are not visible, students incorrectly assume, despite the instructor, that color is the basis for classification. Students often transfer this incorrect information to coarse-grained rocks. Use of thin sections by students along with hand specimen study increases interest in rock identification and understanding of rock classification. Thin-section photomicrographs are used to introduce the laboratory classes to many of the optical properties of minerals. Evaluation by questionnaire suggests that the study of thin sections has a positive effect on the enjoyment and understanding of rock identification and classification by introductory students.