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journal article·2022-03-27Open access

Color Genesis and Compositional Characteristics of Color-Change Sapphire from Fuping, China

Hui Wang, Xiao-Yan Yu, Fei Liu, Masroor Alam, Gai-Chao Wu

Crystals· Volume 12· Issue 4
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Source abstract

Abstract

The color-change sapphire occurs in sillimanite-biotite gneiss in Fuping County Hebei province, China, is one of most famous sapphire deposits in China. However, the color genesis, mechanisms of color changing and compositional characteristics of the sapphire remain enigmatic. In this contribution, the coloration in the Fuping sapphire, color changing mechanisms and, compositional characteristics were studied by conventional gemological instruments in conjunction with ultraviolet-visible spectroscopy and Laser ablation inductively coupled plasma mass spectrometer. The results show that the Fuping sapphire is characterized by purple-blue-to-purple-red changed effect and column-shaped, waist drum-shaped with higher degree of euhedral crystal. Reddish brown rutile inclusions with 120° crossed cleavage are commonly observed. The dominant coloring element of the Fuping sapphire is Fe3+, and subordinate elements are Fe2+, Cr3+ and V3+. The color-change effect is caused by trace elements Cr3+ and V3+. The chemical compositions of Fuping color-change sapphires are analogous to those of metamorphic blue sapphires. When geochemically compared with sapphires from Isalo/Ilakaka deposit in Madagascar, Ratnapura deposit in Sri Lanka and Mogok in Myanmar, the Fuping color-change sapphires have distinctly higher rare element contents of Fe, Cr and Ga.
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Research context

OpenAlex topics: Mineralogy and Gemology Studies · Cultural Heritage Materials Analysis · Geological and Geochemical Analysis

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing Institute of Economics and Management, Beijing 100102, China

State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China

School of Gemology, China University of Geosciences, Beijing 100083, China

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China

Shandong Academician Workstation of Diamond Mineralization Mechanism and Exploration, Shandong No. 7 Exploration Institute of Geology and Mineral Resources, Linyi 276006, China

Key Laboratory of Deep-Earth Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Department of Earth Sciences, Karakoram International University, Gilgit 15100, Pakistan

Funding

State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences · Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) · National Science Foundation of China · China Geological Survey · 7th Institute of Geology & Mineral Exploration of Shandong Province · Key Laboratory of Deep-Earth Dynamics of the Ministry of Natural Resources

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