Ruby from Longido, Tanzania: Mining, Color, Inclusion, and Chemical Features

Author:

Gao Yujie1,He Mingyue2,Lucas Andrew Christopher3,Sun Xueying1,Zhou Dan3,Huang Tiantian1,Li Kai1,Fortaleché Darwin4,Lin Moqing1,Zhu Yuan2,Jin Xiaoting5

Affiliation:

1. Guild Gem Laboratories, Shenzhen 518020, China

2. School of Gemology, China University of Geosciences, Beijing 100183, China

3. Guild Institute of Gemology, Shenzhen 518020, China

4. Guild Gem Laboratories, Bangkok 10310, Thailand

5. Guangdong Provincial Gem & Precious Metal Testing Center, Guangzhou 510080, China

Abstract

This article reports on the recent mining and production status of ruby in Longido, Tanzania. Faceted-grade rubies and their matrix from Longido Area, Tanzania, were investigated by standard gemological testing, including FTIR, UV-VIS, Raman spectra, and LA-ICP-MS. Microscopic observations revealed dense needle-like and triangular inclusions, distinct growth lines, and color banding as typical inclusions. In agreement with the Raman results, the transmission FTIR spectrum confirmed the presence of aluminum hydroxide. The Raman spectra identified associated minerals and inclusions, including zoisite, parasites, feldspar within the matrix, rutile, and diaspore in the ruby host. The chemistry analysis revealed a high amount of Cr and relatively low iron as a good indicator of geographic origin.

Funder

National Science and Technology Infrastructure—The National Infrastructure of Mineral, Rock and Fossil Resources for Science and Technology

Publisher

MDPI AG

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