search for




 

Green-blue Coloured Cu-Zn Hydrated Sulfate Minerals from Gukjeon Mine in Miryang
밀양 국전광산의 녹-청색 구리-아연 수화황산염 광물
Econ. Environ. Geol. 2018 Dec;51(6):473-83
Published online December 31, 2018;  https://doi.org/10.9719/EEG.2018.51.6.473
Copyright © 2018 the Korean society of economic and environmental gelology.

Hyo Jin Koo1, Jeong Kyu Jang1, Jin Young Do2, Gi Young Jeong3 and Hyen Goo Cho1*
구효진1 ·장정규1 ·도진영2 ·정기영3 ·조현구1*

1Department of Geology and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Korea
2
Department of Archaeology, Anthropology and Art History, Gyeongju University, Gyeongju 38065, Korea
3Department of Earth and Environmental Sciences, Andong National University, Andong 36729, Korea
1경상대학교 지질과학과 및 기초과학연구소, 2경주대학교 고고인류미술사학과, 3안동대학교 지구환경과학과
Received November 5, 2018; Accepted December 15, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Green-blue coloured supergene minerals are covering host rocks along the gallery wall in the Gukjeon mine, a lead – zinc skarn deposit located in Miryang, Gyeongsangnam-do. These minerals have been described as azurite or malachite, but recent study recognized that the green minerals are devilline and blue minerals are Cu-Zn hydrated sulfates, but exact identification and detailed mineral characteristics are also not well known. In this study, we divide green-blue minerals into five groups (GJG) according to their external features and conducted XRD and SEM analyzes in order to identify mineral name and clarify the mineralogical characteristics. GJG-1, a bright bluish green group, consists of brochantite and quartz and GJG-2, a pale green colour with easily crumbly, of schulenbergite and a small amount of gypsum. Although pale blue GJG-3 and glassy lustrous bluish green GJG-4 have the same mineral assemblages with serpierite and gypsum in spite of different colour and luster, gypsum content may control the physical properties. GJG-5 with a gel phase mixture of pale blue and dark blue mineral is comprised of hydrowoodwardite, glaucocerinite, bechererite, serpierite and gypsum. The six green-blue minerals from the Gukjeon mine could be classified by Cu:Zn ratio, (Si + Al) content, Si:Al ratio, and Ca content. The physico-chemical environment of mineral formation is considered to be controlled by the geochemical factors in the surrounding fluid, and it looks forward that the accurate formation environment will be revealed through additional research. This paper gives greater mineralogical significance in the first report of several hydrated sulfate such as serpierite, glaucocerinite and bechererite in Korea. It has also rarely been reported the occurrence of several Cu-Zn hydrated sulfate in the same deposit in the world.
Keywords : Gukjeon mine, hydrated sulfate mineral, brochantite, schulenbergite, serpierite

 

December 2018, 51 (6)