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$4,000.00 USD
Estimated RRP $8,000.00
Closed
01/10/2021 11:33 pm
1172
7
Rarest 13.80 Carat Top Quality Loupe Clean Bastnasite Gemstone
1172
7
- SKU
- Dimensions (mm)
- 12.150 x 11.500 x 8.900mm
- Weight (cts)
- 13.800
- Type
- Faceted
- Colours
-
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).
- SKU
- Dimensions (mm)
- 12.150 x 11.500 x 8.900 mm
- Weight (cts)
- 13.800
- Type
- Faceted
- Colours
-
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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Rest of the world
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Shipping Details
Shipping:
$13.00 21 days via Standard Shipping - Tracked
Ships from:
Thailand
Payment Options
Overview
Listing Type :
Standard
Product ID :
1305388
Starts : 27th September 2021 04:50 am PDT
* All prices are in USD