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Mineralogical Characteristics of Stellerite associated with the Yucheon Granite, Cheongdo, Korea  

Choo, Chang-Oh (Ecological River Environmental Technology Institute)
Lee, Jin-Kook (Ecological River Environmental Technology Institute)
Cho, Hyen-Goo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.21, no.4, 2008 , pp. 365-372 More about this Journal
Abstract
Because stellerite, belonging to the zeolite group, is much less common mineral than any other minerals in Korea, little mineralogical study has been done so far. Stellerite occurs on open surfaces of fractured zones in the Yucheon Granite associated with flowery tourmaline, Chongdo, Gyeongsangbuk-do. Stellerite with $3{\sim}4\;mm$ length and $1{\sim}2\;mm$ width is characterized by an equigranular and euhedral form. Flat and elongated columnar crystals show well developed (010) face. Stellerite shows an intensive alteration process, possibly due to weathering or devitrification, as evidenced by microtextural analysis of Scanning Electron Microscope (SEM). Water loss occurs at $161^{\circ}C$ while dehydroxylation occurs at $467^{\circ}C$ causing decomposition of the structure afterward. From its textural observation, it is concluded that stellerite formed rapidly at small undercooling, precipitated from residual melt during the late stage with relatively constant chemistry.
Keywords
Stellerite; the Yucheon Granite; equigranular; euhedral;
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