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Gemmological Characteristics and Origin of Basalt-related Pyrope from Southeast Vietnam
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Journal Article
Gemmological Characteristics and Origin of Basalt-related Pyrope from Southeast Vietnam
2023
Overview
Basalt-related pyrope from Southeast Vietnam occurs as both xenocrysts and xenoliths, and is collected from secondary deposits. The garnet is transparent deep orange to light red when observed with transmitted light. The gemmological characteristics, as well as Raman and FTIR spectra, confirm it is pyrope. The chemical composition yields molar percentages of [Py.sub.72.0-75.3][Al.sub.14.8-18.3] [Gr.sub.9.2-9.9] (where Py = pyrope, Al = almandine and Gr = Grossular) and an average chemical formula of [([Mg.sub.2.15][Fe.sup.2+.sub.0.42][Ca.sub.0.27][Mn.sub.0.01]).sub.2.85][Al.sub.2.14]([Si.sub.2.99][O.sub.12]). The surfaces of the pyrope exhibit resorption that occurred during transport to the surface in basaltic magma. Examination of coronae (kelyphitic texture) surrounding the xenolithic garnets with a petrographic microscope, combined with FTIR spectroscopy, shows that the pyrope originated from a deep garnet peridotite source.
Publisher
Gem-A, The Gemmological Association of Great Britain,The Gemmological Association of Great Britain
Subject
