| Reference Type | Journal (article/letter/editorial) |
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| Title | The Sinoniki Spessartine Deposit in Longido, Tanzania–A New Source of Bright Orange Spessartine ('Mandarin') Garnet. |
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| Journal | The Journal of Gemmology |
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| Authors | Stephan, Tom | Author |
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| Lind, Thomas | Author |
| Milisenda, Claudio C | Author |
| Kneipp, Fabian | Author |
| Year | 2024 | Volume | 39 |
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| Page(s) | 171-177 | Issue | 2 |
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| Publisher | Gem-A |
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| Original Entry | Tom Stephan, Thomas Lind, Claudio C. Milisenda and Fabian Kneipp (2024): The Sinoniki Spessartine Deposit in Longido, Tanzania — A New Source of Bright Orange Spessartine ('Mandarin') Garnet. The Journal of Gemmology 39 (2), xx-xx. |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17494039 | Long-form Identifier | mindat:1:5:17494039:7 |
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| GUID | 0 |
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| Full Reference | Stephan, Tom, Lind, Thomas, Milisenda, Claudio C, Kneipp, Fabian (2024) The Sinoniki Spessartine Deposit in Longido, Tanzania–A New Source of Bright Orange Spessartine ('Mandarin') Garnet. The Journal of Gemmology, 39 (2). 171-177 |
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| Plain Text | Stephan, Tom, Lind, Thomas, Milisenda, Claudio C, Kneipp, Fabian (2024) The Sinoniki Spessartine Deposit in Longido, Tanzania–A New Source of Bright Orange Spessartine ('Mandarin') Garnet. The Journal of Gemmology, 39 (2). 171-177 |
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| In | (2024) The Journal of Gemmology Vol. 39 (2). Gem-A |
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| Abstract/Notes | In early 2023, the Sinoniki spessartine deposit was discovered in the Longido region of north-eastern Tanzania. It produces bright orange material also known in the trade as ‘Mandarin garnet’. To date, there has been only limited production from this mine, and the cut stones are typically small (<0.5 ct) but relatively free of inclusions. Internal features consist of partially healed fissures and prominent growth structures, as well as apatite and quartz inclusions. The stones show a classic spessartine absorption spectrum, whereas their chemical composition is distinctive, with elevated Ca (approximately 18–21 mol.% grossular component, which is very uncommon for spessartine) and Mg (16–17 mol.% pyrope component). This results in relatively low values for RI (1.786–1.788) and SG (3.65–3.72). Together with the chemical signature, these values make it straightforward to separate Sinoniki material from spessartine of other commercially important sources. |
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