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The Classifying Ability of the Igneous Rocks with Naked Eyes for Preservice Science Teachers  

Moon Byoung Chan (Department of Earth Science Education, Korea National University of Education)
Jeong Jin-Woo (Department of Earth Science Education, Korea National University of Education)
Chung Chull Hwan (Research Center for Humanities, Mokpo National University)
Publication Information
Journal of the Korean earth science society / v.26, no.7, 2005 , pp. 630-639 More about this Journal
Abstract
The purpose of this study was to investigate the classifying ability of the igneous rocks with the naked eye for 36 preservice science teachers. For this, we selected six specimens of igneous rocks that consisted of rhyolite, andesite, basalt, granite, diorite, and gabbro, and performed the questionnaire with them. Preservice science teachers needed the average of 3 tools to classify the rocks. Most of the selected tools were loupe, streak plate, hammer and Mohs’ hardness scale. Many preservice science teachers selected basalt and granite samples to classify igneous rocks among 6 kinds of the rocks which were exhibited. However, the results of the identification with the naked eye showed that the right answer rate was significantly different based on what rock sample had been selected. Nobody gave the right answer among 10 students who chose the rhyolite sample, but all of 36 students who picked the basalt sample answered correctly. And $62\%$ of 8 students who chose the andesite sample, 62% of 32 student choosing granite, $7\%$ of 13 students choosing diorite and $44\%$ of 9 students choosing gabbro were correctly answered. In identifying igneous rock samples with the naked eye, most subjects relied on vesicular texture to basalt, and they used textural, color and empirical characters to granite. But, some felt more or less difficulty to distinguish between intermediate and light colors and to recognize porphyry.
Keywords
igneous rock; igneous rock classification with naked eyes;
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