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Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
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Detailed Mineral List:
Albite var: Cleavelandite
Locality: Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
'Apatite'
Reference: 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): Ore Geology Reviews 34, 169-191.
'Biotite'
Locality: Tan Lap Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Calcite
Formula: CaCO3
Reference: with fluorcannilloite specimens obtained at Luc Yen by Eugeni Bareche
Localities: Recorded from at least 3 other localities in this region.
'Chlorite Group'
Reference: 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): Ore Geology Reviews 34, 169-191.
Chondrodite
Formula: (Mg,Fe2+)5(SiO4)2(F,OH)2
Locality: Sungate Mine, An Phu (Anfu), Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Photo: © Rob Lavinsky. Chondrodite from Sungate Mine, An Phu, Luc Yen, Yenbai Province, Vietnam
Corundum
Formula: Al2O3
Localities: Sungate Mine, An Phu (Anfu), Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Luc Yen Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Photo: © Oleg Lopatkin. Corundum from Minh Tien Mine, Luc Yen, Yenbai Province, Vietnam
Corundum var: Ruby
Formula: Al2O3
Reference: [www.johnbetts-fineminerals.com]
Localities: Recorded from at least 6 other localities in this region.
Photo: © 2001 John H. Betts. Ruby from Luc Yen, Yenbai Province, Vietnam
Corundum var: Sapphire
Formula: Al2O3
Reference: Van King
Localities: Recorded from at least 6 other localities in this region.
Photo: © Rob Lavinsky. Sapphire from Luc Yen, Yenbai Province, Vietnam
Danburite
Formula: CaB2Si2O8
Locality: Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Dravite
Formula: Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Localities: Reported from at least 6 localities in this region.
Photo: © Marek Patus. Dravite from Luc Yen, Yenbai Province, Vietnam
Edenite
Formula: {Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
Localities: Reported from at least 6 localities in this region.
Photo: Edenite from An Phu, Luc Yen, Yenbai Province, Vietnam
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Locality: Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Photo: © www.quebulfineminerals.com. Elbaite from Minh Tien Mine, Luc Yen, Yenbai Province, Vietnam
Fluoro-cannilloite
Formula: {Ca}{Ca2}{Mg4Al}(Al3Si5O22)(F,OH)2
Description: (All "fluor-cannilloite" specimens from here turn out on analysis to be pargasite.)see: http://www.mindat.org/mesg-106-259756.html
Reference: http://www.thearkenstone.com/tuc-china2.html; Eugeni Bareche (2007) An Phu, Luc Yen, Vietnam. Revista de Minerales (Barcelona), 2007/2, 26-29.
Localities: Recorded from at least 1 other locality in this region.
Photo: © Dan & Diana Weinrich Minerals. Fluoro-cannilloite from Luc Yen, Yenbai Province, Vietnam
Graphite
Formula: C
Reference: 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): Ore Geology Reviews 34, 169-191.
Localities: Recorded from at least 6 other localities in this region.
Humite
Formula: (Mg,Fe2+)7(SiO4)3(F,OH)2
Reference: 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): Ore Geology Reviews 34, 169-191.
Localities: Recorded from at least 1 other locality in this region.
Photo: © Christian Bracke. Humite from Minh Tien Mine, Luc Yen, Yenbai Province, Vietnam
'Humite Group'
Locality: Cung Truoi Mine, An Phu (Anfu), Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Photo: © MLD. Humite Group from Luc Yen, Yenbai Province, Vietnam
Lepidolite
Locality: Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
'Liddicoatite' ?
Formula: Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Locality: Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Margarite
Formula: CaAl2(Al2Si2O10)(OH)2
Localities: Reported from at least 6 localities in this region.
Microcline
Formula: KAlSi3O8
Localities: Tan Lap Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Microcline var: Amazonite
Localities: Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
An Phu (Anfu), Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Localities: Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Cung Truoi Mine, An Phu (Anfu), Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
'Olivine'
Formula: (Mg,Fe2+)2SiO4
Reference: 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): Ore Geology Reviews 34, 169-191.
Orthoclase
Formula: KAlSi3O8
Reference: 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): Ore Geology Reviews 34, 169-191.
Paragonite
Formula: NaAl2(AlSi3O10)(OH)2
Reference: 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): Ore Geology Reviews 34, 169-191.
Pargasite
Formula: {Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Description: Intense green crystals up to 5 cm large in association with red spinel in calcite-dolomite marble (Hauzenberger et al., 2005). Ca = 1.97 apfu, Na+K = 0.72 apfu, F = 0.54 apfu. Full composition: Si 6.34 Ti 0.03 Al 2.38 Cr 0.04 Fe < 0.01 Mn < 0.01 Mg 4.25 Ca 1.97 Na 0.66 K 0.06 ------- F 0.54 Cl < 0.01
Reference: 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; http://www.mindat.org/mesg-7-69925.html
Localities: Recorded from at least 2 other localities in this region.
Photo: © Rob Lavinsky. Pargasite from Luc Yen, Yenbai Province, Vietnam
Phlogopite
Formula: KMg3(AlSi3O10)(OH,F)2
Reference: 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): Ore Geology Reviews 34, 169-191.
Localities: Recorded from at least 6 other localities in this region.
Photo: Phlogopite from Luc Yen Mine, Luc Yen, Yenbai Province, Vietnam
Pyrite
Formula: FeS2
Reference: 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): Ore Geology Reviews 34, 169-191.
Localities: Recorded from at least 6 other localities in this region.
Pyrrhotite
Formula: Fe1-xS (x = 0 to 0.17)
Reference: with fluorcannilloite specimens obtained at Luc Yen by Eugeni Bareche
Quartz
Formula: SiO2
Locality: Tan Lap Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Quartz var: Smoky Quartz
Formula: SiO2
Locality: Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Rossmanite
Formula: ☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)
Locality: Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Rutile
Formula: TiO2
Reference: various correctly added photos
Localities: Recorded from at least 6 other localities in this region.
Photo: © 2009 S.Sayamov. Rutile from Luc Yen, Yenbai Province, Vietnam
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Locality: Tan Lap Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam
Photo: © John Sobolewski. Schorl from Tan Lap Mine, Luc Yen, Yenbai Province, Vietnam
Spinel
Formula: MgAl2O4
Reference: Pham Van Long, Gaston Giuliani, Virginie Garnier, Daniel Ohnenstetter (2004) Gemstones in Vietnam. The Australian Gemmologist Volume 22, Number 4, October–December 2004
Localities: Recorded from at least 8 other localities in this region.
Photo: © Rob Lavinsky. Spinel from Luc Yen, Yenbai Province, Vietnam
Titanite
Formula: CaTi(SiO4)O
Reference: 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): Ore Geology Reviews 34, 169-191.
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Pham Van Long, Gaston Giuliani, Virginie Garnier, Daniel Ohnenstetter (2004) Gemstones in Vietnam. The Australian Gemmologist Volume 22, Number 4, October–December 2004
Localities: Recorded from at least 4 other localities in this region.
Photo: © Rob Lavinsky. Tourmaline from Luc Yen, Yenbai Province, Vietnam
'Unnamed (Pb-dominant Tourmaline)'
Formula: (Pb,Na)(Li,Al)3Al6(Si6O18)(BO3)3(OH)3(F,OH)
Locality: Minh Tien Mine, Luc Yen, Yenbai Province (Yen Bai Province), Vietnam


39 entries listed. 25 valid minerals. 1 erroneous literature entry.

References

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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