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🔗 Source: ssef.ch
📊 Size: 991 KB
📄 Pages: 20 pages
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A new deposit of Co-bearing blue spinel was discovered in September 2021 in the Lukande area, near Mahenge, Tanzania. 44 faceted spinels were analyzed, showing characteristic inclusion features and two types of spinel: attractive blue stones with an average Co concentration of 32 ppm and darker material with higher Co concentrations. The spinels can be separated from Co-bearing spinels from other countries based on their trace-element composition. U-Pb dating indicates the Tanzanian spinels formed around 500-570 million years ago. The new deposit has generated significant interest in the gem trade due to the attractive coloration and relatively large sizes of the spinels. Artisanal miners extract the spinels from an eluvial layer and heavily weathered marble, with most miners unable to cover their expenses due to the common inclusion and undesirable coloration of the stones.

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A new deposit of Co-bearing blue spinel was discovered in September 2021 in the Lukande area, near Mahenge, Tanzania.

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  • File Format: PDF
  • File Size: 991 KB
  • Pages: 20
  • Language: EN
  • Total Downloads: 85
  • Last Updated: 2 hours ago

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