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Petrological and Mineralogical Characteristics of Amphibolite Used as Rock Bowl and Pot: Implications for Its Utility and Stability  

Kim, Hyeong-Soo (Department of Earth Sciences Education, Kyungpook National University)
Choi, Ho-Jeong (Gyungbuk Science High School)
Publication Information
The Journal of the Petrological Society of Korea / v.17, no.3, 2008 , pp. 154-165 More about this Journal
Abstract
Rock bowls and pots used in restaurants are one of the popular usages of natural rocks in Korea. Most rock bowls and pots are made of Mg- and Ca-rich amphibolite composed of hornblende, actinolite, tremolite, diopside, plagioclase. Hornblende occurs as prismatic crystal habit, and belongs to Mg-hornblende to tschermakite. Actinolite and tremolite occur as acicular form (aspect ratio $0.10{\sim}0.13$), and ranges 0.65 to 0.90 in Mg/(Mg+Fe) ratio. These acicular actinolite and tremolite are non-asbestos minerals. However to use of rocks containing these minerals as tableware it is needed to regulatory guidelines for stability and utility based on petrological and mineralogical characteristics. Discrepancy of rock occurrence and mineral chemistry between commercial rock bowls and original rocks indicate that most rock bowls are made of uncertain amphibolite in original location. Consequently, there is a potential risk to use inappropriate amphibolites as tableware. Therefore, it is needed to systematically research on geology and biology, and manage commercial rock bowls and pots used in Korean restaurants.
Keywords
Amphibolite; Acicular actinolite and tremolite; Rock bowls and pots;
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