| Reference Type | Journal (article/letter/editorial) |
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| Title | Chromite and Its Thin Kosmochlor and Cr-Omphacite Cortex in Amphibolite from the Myanmar Jadeite Deposits |
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| Journal | Crystals |
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| Authors | Zhang, Yu | Author |
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| Shi, Guanghai | Author |
| Wen, Jiabao | Author |
| Year | 2025 | Volume | < 15 > |
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| Issue | < 1 > |
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| URL | |
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| DOI | doi:10.3390/cryst15010079Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17899223 | Long-form Identifier | mindat:1:5:17899223:1 |
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| GUID | 0 |
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| Full Reference | Zhang, Yu, Shi, Guanghai, Wen, Jiabao (2025) Chromite and Its Thin Kosmochlor and Cr-Omphacite Cortex in Amphibolite from the Myanmar Jadeite Deposits. Crystals, 15 (1). doi:10.3390/cryst15010079 |
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| Plain Text | Zhang, Yu, Shi, Guanghai, Wen, Jiabao (2025) Chromite and Its Thin Kosmochlor and Cr-Omphacite Cortex in Amphibolite from the Myanmar Jadeite Deposits. Crystals, 15 (1). doi:10.3390/cryst15010079 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | Chromite in the amphibolites of the Myanmar jadeite deposits has not been well studied. Mineralogical studies on chromite and related kosmochlor and Cr-omphacite in the amphibolite of the Myanmar jadeite deposits were conducted. Compared to the chromite in the adjacent serpentinized peridotite, the chromite had higher Cr2O3 (45.67â54.25 wt.%) and MnO (1.82â1.90 wt.%) but lower MgO (1.00â1.96 wt.%) and Al2O3 (1.05â15.09 wt.%), similar to the published chromite compositions in jadeitite. Serpentinite was derived from a highly depleted mantle peridotite. There were at least two stages of metasomatism during the transformation of serpentinite + chromite to magnesio-katophorite + chromite + thin kosmochlor (and/or Cr-omphacite cortex). The first stage was the Ca-rich metasomatism of serpentinite, resulting in sodic-calcic amphibole (magnesio-katophorite), which preceded the formation of jadeite. The second stage of Na-rich metasomatism was produced by the Na-Al-Si-rich fluids with the magnesio-katophorite + chromite (contemporaneous with the formation of jadeite). The composition of the fluid was altered by a reaction with magnesio-katophorite, increasing the Ca-Mg content and resulting in the formation of kosmochlor rich in Ca-Mg and/or peripheral Cr-omphacite. This kosmochlorâCr-omphacite belongs to the Jd-Kos-Di ternary join, which differs from the kosmochlorâCr-jadeite (which belongs to the Jd-Kos join in jadeitite). The formation of jadeitite with chromite + kosmochlor + Cr-jadeite occurs when large amounts of Na-Al-Si-rich fluids have wrapped the pieces of chromite-bearing amphibolite. This also explains the proverbial âmoss spray greenâ given that amphibole (with chromite) brings out the green color in jadeitite. |
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