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Luc Yen, Yenbai Province (Yen Bai Province), Vietnam

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Detailed Mineral List:


Albite
Formula: Na(AlSi3O8)
Albite var: Cleavelandite
Formula: Na(AlSi3O8)
'Apatite'
'Biotite'
Calcite
Formula: CaCO3
'Chlorite Group'
Chondrodite
Formula: (Mg,Fe2+)5(SiO4)2(F,OH)2
Corundum
Formula: Al2O3
Corundum var: Ruby
Formula: Al2O3
Corundum var: Sapphire
Formula: Al2O3
Danburite
Formula: CaB2Si2O8
Dravite
Formula: Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Localities: Reported from at least 6 localities in this region.
Edenite
Formula: {Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
Localities: Reported from at least 6 localities in this region.
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
'Fayalite-Forsterite Series'
Fluoro-cannilloite
Formula: {Ca}{Ca2}{Mg4Al}(Al3Si5O22)(F,OH)2
Graphite
Formula: C
Humite
Formula: (Mg,Fe2+)7(SiO4)3(F,OH)2
'Humite Group'
'Lepidolite'
Margarite
Formula: CaAl2(Al2Si2O10)(OH)2
Localities: Reported from at least 6 localities in this region.
Microcline
Formula: K(AlSi3O8)
Microcline var: Amazonite
Formula: K(AlSi3O8)
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
'Olivine'
Orthoclase
Formula: K(AlSi3O8)
Paragonite
Formula: NaAl2(AlSi3O10)(OH)2
Pargasite
Formula: {Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Pyrite
Formula: FeS2
Pyrrhotite
Formula: Fe7S8
Quartz
Formula: SiO2
Quartz var: Smoky Quartz
Formula: SiO2
Rossmanite
Formula: ☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)
Rutile
Formula: TiO2
Sassolite
Formula: H3BO3
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Spinel
Formula: MgAl2O4
Titanite
Formula: CaTi(SiO4)O
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
'Unnamed (Pb-dominant Tourmaline)'
Formula: (Pb,Na)(Li,Al)3Al6(Si6O18)(BO3)3(OH)3(F,OH)

References

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Van Long, P., Quang Vinh, H., Garnier, V., Giuliani, G., Ohnenstetter, D., Lhomme, T., Schwarz, D., Fallick, A.E., Dubessy, J. and Trong Trinh, P. (2004): Gem corundum deposits in Vietnam. Journal of Gemmology, 29, 129-142.
Hauzenberger, Ch.A., Walter, F., Hofmeister, W., Phan Tien, D. & Kienzl, N. (2005): Mineralogical, petrological and crystallographic investigations of two amphiboles from ruby and spinel bearing marbles, Luc Yen, Province Yen Bai, Vietnam. In: Hofmeister, W. et al. (ed): Proceedings of the third international workschop on gem-materials and modern analytical methods. Hanoi, Vietnam. 3-8.
Eugeni Bareche (2007) An Phu, Luc Yen, Vietnam. Revista de Minerales (Barcelona), 2007/2, 26-29.
Tamagnini, F. (2007). Tormaline policrome in Vietnam. Un nuovo ritrovamento nei pressi di Luc Yen. Rivista Mineralogica Italiana, 31 (2), 104-107.
Garnier, V., Giuliani, G., Ohnenstetter, D., Fallick, A.E., Dubessy, J., Banks, D., Vinh, H.Q., Lhomme, T., Maluski, H., Pêcher, A., Bakhsh, K.A., Long, P.V., Trinh, P.T., and Schwarz, D. (2008): Marble-hosted ruby deposits from Central and Southeast Asia: Towards a new genetic model. Ore Geology Reviews 34, 169-191.
Patureau, J. (2011): Un minéralogiste et collectionneur francais á Luc Yen, Vietnam. La Régne Minéral.99, 39-48
Pham Van Long, Vincent Pardieu, and Gaston Giuliani (2013): Update on Gemstone Mining in Luc Yen, Vietnam. Gems & Gemology 49, 233-245.

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