A Study on Beryl in the Cuonadong Be-W-Sn Polymetallic Deposit, Longzi County, Tibet, China

Jia-Qi Shen,En-Qi Li,Bo Xu,Wei Liang,Zhi-Kang Hu,Yu-Fei Zhang,Shi-Yuan Cui

doi:10.3390/cryst11070777

Abstract

Recently, aquamarine was discovered in the Cuonadong Be-W-Sn Polymetallic Deposit, Longzi County, Tibet. Longzi aquamarine is being extracted and is expected to be available over the next decade. This study provides a full set of data through standard gemmological properties, including scenes, color characteristics and advanced spectroscopic and chemical analyses, including micro ultraviolet–visible–near-infrared (UV–Vis–NIR), Raman and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The main inclusions in Longzi aquamarine are gas–liquid inclusions and a great number of quartz inclusions. The content of type I H2O is greater than that of type II H2O because of the low-alkali metal content, and “tetrahedral” substitutions and “octahedral” substitutions exist at the same time.

Highlights

IntroductionBeryl is is aa common common beryllium-bearing beryllium-bearing cyclosilicate cyclosilicate mineral mineral with high transparency, transparency, Beryl similar to tomany manygem-quality gem-quality minerals. minerals
The refractive index (RI) and birefringence (DR) of the crystal polishing surface were measured with a refractometer (Xueyuan Jewelry Technologies, Wuhan, China) using diiodimethane as refractive oil
The samples was observed by Chelsea Color Filter (CCF) (Baoguang Technologies, Nanjing, China) and it’s fluorescence was observed by the ultraviolet light with main wavelengths of 365 nm and 254 nm

Summary

Introduction

IntroductionBeryl is is aa common common beryllium-bearing beryllium-bearing cyclosilicate cyclosilicate mineral mineral with high transparency, transparency, Beryl similar to tomany manygem-quality gem-quality minerals. minerals. Beryl is is aa common common beryllium-bearing beryllium-bearing cyclosilicate cyclosilicate mineral mineral with high transparency, transparency, Beryl similar to tomany manygem-quality gem-quality minerals. The. The iron-bearing iron-bearing green–blue, green–blue, blue–green blue–green or or light light similar blue–blueberyl berylisisknown knownas asaquamarine. Most aquamarine aquamarineisisgenerated generatedin inhighly highlyevolved evolved blue–blue leucogranites, leucogranites,such suchas asin inthe theAracuai. Aracuaiorogen orogenin inBrazil Brazil[1]. Publisher’s Note: MDPI stays neutral with regard toNote: jurisdictional claims in Publisher’s The iron-bearing iron-bearing green–blue, green–blue, blue–green blue–green or or light light similar blue–blueberyl berylisisknown knownas asaquamarine. aquamarine.Most

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