• Journal of the Mineralogical Society of Korea
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• v.17 no.2
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• pp.169-176
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• 2004

The Osaeg hotspring (long. $128^{\circ}$ 56'E, tat. $37^{\circ}$ 06'N) located in the northester part of Kangwon-do, Korea. The pH value of the hot spring water is 8.31, and the EC, $SO_4$, F and Na are 196 ${\mu}\textrm{s}$/cm, 10.88 mg/L, 8.19 mg/L, and 37.07 mg/L, respectively. The ocherous precipitates are precipitated on the stream bottom of Osaeg hot spring drainage. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and stereo-microscope were used to analyze the precipitates. X-ray diffraction analysis shows that the precipitates consist mainly of poorly crystalline materials and messelite. Many spherical and rod-shaped bacteria-like forms were observed in the precipitates.