Mineralogy Characteristics and Coloration Mechanism of Green Tourmaline in Tanzania

TAO Longfeng; JIN Cuiling; ZHANG Qianshen; HAN Xiuli

doi:10.15898/j.cnki.11-2131/td.202009280127

Rock and Mineral Analysis > 2022 > 41(2): 324-331. > DOI: 10.15898/j.cnki.11-2131/td.202009280127

TAO Longfeng, JIN Cuiling, ZHANG Qianshen, HAN Xiuli. Mineralogy Characteristics and Coloration Mechanism of Green Tourmaline in Tanzania[J]. Rock and Mineral Analysis, 2022, 41(2): 324-331. DOI: 10.15898/j.cnki.11-2131/td.202009280127

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Mineralogy Characteristics and Coloration Mechanism of Green Tourmaline in Tanzania

1.
School of Gemmology and Materials Science, Hebei GEO University, Shijiazhuang 050031, China
2.
College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China

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Received Date: September 27, 2020
Revised Date: June 23, 2021
Accepted Date: October 21, 2021
Published Date: March 27, 2022

Abstract

HIGHLIGHTS
(1) The chemical composition of green tourmaline in the study area was different from that of green tourmaline in other area. The former was magnesium tourmaline, while the latter was generally lithium tourmaline.

(2) Tanzanian green tourmaline showed a single crystal, small grain, no cleavage, and split development.

(3) Minor Cr³⁺ replacing Al³⁺ into the crystal lattice was the main cause of the green color, with little contribution from Fe.

ABSTRACT

BACKGROUNDThere are differences in the production characteristics, chemical composition, coloration mechanism and formation conditions of green tourmaline from different producing areas. At present, the mineral species and coloration mechanism of Tanzanian green tourmaline have not been solved, which makes it difficult for its scientific identification and quality rating.
OBJECTIVESTo study the mineralogical characteristics and coloration mechanism of Tanzanian green tourmaline.
METHODSThe mineral component was analyzed by infrared spectroscopy and Raman spectroscopy. Microtexture was characterized by polarized light microscopy. Electron probe microanalyzer, and ultraviolet-visible (UV-Vis) spectroscopy were applied to analyze the chemical composition.
RESULTSThe main mineral component of tourmaline in Tanzania was MgO tourmaline, which was characterized by single crystal, small grain, no cleavage, and split development, and can be used as a gemstone. The main chemical component of green tourmaline was SiO₂, Al₂O₃, MgO and B₂O₃, with average contents of 37.52%, 36.26%, 9.65% and 8.42%, respectively. In addition, it contained a small amount of FeO, Cr₂O₃ and TiO₂. Combined with the absorption spectrum in the ultraviolet region of 440nm, 600nm and 680nm in UV-Vis spectroscopy, it was concluded that the tiny amounts of Cr³⁺ replacing Al³⁺ into the crystal lattice was the main cause of the green color.
CONCLUSIONSThe mineralogical characteristics and coloration mechanism of green tourmaline in Tanzania was confirmed, which provides a theoretical basis for the scientific identification, further quality evaluation and utilization.
- tanzania,
- green tourmaline,
- chemical component,
- coloration mechanism,
- electron probe microanalyzer,
- ultraviolet-visible spectroscopy

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References (31)

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