Rarest 4.05 Carat Top Quality Loupe Clean Bastnasite Gemstone
項目信息
| 尺寸（毫米） | 11.58 x 6.11 x 4.5毫米 |
| 重量（克拉） | 4.05 克拉 |
| 顏色 | |
| Type |
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| Treatment |
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加工...
Bastnäsite-(Ce), which has the chemical formula (Ce,RE)(CO3)(F,OH), and parisite-(Ce), or Ca(Ce,RE) 2(CO3) 3(F,OH)2, are cerium-dominant rare-earth (RE) carbonates. Although they very rarely form as crystals large and clean enough for faceting, one locality in Pakistan (Zagi or Zegi Mountain) has produced bastnäsite-(Ce) that has been faceted into stones up to 20 ct (Johnson, 1999; Obodda and Leavens, 2004). Gem-quality parisite-(Ce) has been reported very rarely, usually associated with Colombian emeralds such as those from Muzo (Henn et al., 1992). In fact, the mineral is named in honor of J. I. Paris, one of the first managers of the Muzo mine (Palache et al., 1963). This note reports on bastnäsite- (Ce) and parisite-(Ce) from Malawi’s Mt. Malosa, where these minerals occur as well-formed crystals that locally may contain clear, gem-quality portions (e.g., figure 1). One of the authors (AG) visited the deposit in 2002 for research purposes, and has documented the geology and mineralogy of the area in other publications (e.g., Guastoni et al., 2007, 2009).
Bastnäsite-(Ce), which has the chemical formula (Ce,RE)(CO3)(F,OH), and parisite-(Ce), or Ca(Ce,RE) 2(CO3) 3(F,OH)2, are cerium-dominant rare-earth (RE) carbonates. Although they very rarely form as crystals large and clean enough for faceting, one locality in Pakistan (Zagi or Zegi Mountain) has produced bastnäsite-(Ce) that has been faceted into stones up to 20 ct (Johnson, 1999; Obodda and Leavens, 2004). Gem-quality parisite-(Ce) has been reported very rarely, usually associated with Colombian emeralds such as those from Muzo (Henn et al., 1992). In fact, the mineral is named in honor of J. I. Paris, one of the first managers of the Muzo mine (Palache et al., 1963). This note reports on bastnäsite- (Ce) and parisite-(Ce) from Malawi’s Mt. Malosa, where these minerals occur as well-formed crystals that locally may contain clear, gem-quality portions (e.g., figure 1). One of the authors (AG) visited the deposit in 2002 for research purposes, and has documented the geology and mineralogy of the area in other publications (e.g., Guastoni et al., 2007, 2009).
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$
出價
$3,000.00
$102
節省 $2,898
船運 $15.00
Standard Shipping - Tracked的21數
Standard Shipping - Tracked的21數
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審計信息
Gemstone Sheriff程序允許我們的會員請求對任何拍賣進行審核，審核由獨立的Gemologist完成，他評估項目描述和圖片的準確性。
定價和細節
| 出價增量 | $1 |
| 起拍價 | $1 |
| 拍賣編號 | 1412448 |
| 守望者 | 5人數 |
| 看過 | 1,308次 |
| 開始 | 1st Jun 2023 5:30pm PDT |
| 結束 | 15th Jun 2023 5:29pm PDT |
航運保險
| 供應商 | 船運 | 中轉 |
|---|---|---|
| DHL | $30.00 | 4天 |
| FedEx | $50.00 | 4天 |
| Standard Shipping - Tracked | $15.00 | 21天 |
| 運輸保險所有供應商$0.00 (選修的) | ||
