1. Characterisation of Pink-to-Red Spinel from Four Important Localities.
- Author
-
Chawalit Chankhantha, Ratthaphon Amphon, Rehman, Habib Ur, and Shen, Andy H.
- Subjects
APATITE ,SPINEL ,FISHER discriminant analysis ,METAMORPHIC rocks ,SPINEL group ,ANALYTICAL chemistry - Abstract
Most pink-to-red spinel that is currently available on the global gem market originates from moderate- to high-grade metamorphic rocks. For this study, we characterised 60 such spinels from Myanmar, Tajikistan, Tanzania and Vietnam. They ranged from pink to red with orange or blue modifiers due to combinations of the chromophores Cr
3+ , V3+ and Fe2+ . The most common mineral inclusions in the samples from Myanmar, Vietnam and Tanzania were apatite crystals and graphite platelets, and we also observed zircon in the spinels from Tanzania. Octahedral negative crystals and partially healed fractures were present in samples from all four origins, while dislocations/ needles were found only in those from Tanzania and Vietnam. Linear discriminant analysis of chemical data obtained by LA-ICP-MS was performed using seven elements (Ti, V, Cr, Fe, Zn, Ga and Sn) and provided potential criteria for separating spinels from these four important localities. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF