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About HughesiteHide

John Hughes
orange to golden orange
Specific Gravity:
2.29 (Calculated)
Crystal System:
Named in honor of Dr. John Michael Hughes (b. 1952), formerly Professor of Mineralogy at Miami University and now Professor of Mineralogy and former Provost at the University of Vermont, for his long and outstanding career in mineralogy, including his extensive work on the pascoite family of minerals and vanadium bronzes.
Hughesite is orange to golden orange, and its streak is yellow. The thinnest layers of hughesite appear orange, whereas the thickest layers are golden orange. Crystals are variable in habit, from blocky to spear-shaped and platy.

Classification of HughesiteHide

Approval Year:

7 : Phosphates, Arsenates, Vanadates
X : Unclassified Strunz Phosphates, Arsenates and Vanadates
0 :

Physical Properties of HughesiteHide

orange to golden orange
Hardness Data:
one good direction of cleavage parallel to (001)
2.29 g/cm3 (Calculated)

Optical Data of HughesiteHide

Biaxial (-)
RI values:
nα = 1.698 nβ = 1.740 nγ = 1.770
Measured: 84° (2), Calculated: 79°
Max Birefringence:
δ = 0.072
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
strong dispersion, with r > v.
pleochroic with X = Y light golden yellow, and Z dark golden yellow.

Chemical Properties of HughesiteHide

IMA Formula:
Na3AlV10O28 · 22H2O

Crystallography of HughesiteHide

Crystal System:
Class (H-M):
1 - Pinacoidal
Space Group:
Cell Parameters:
a = 8.668 Å, b = 10.295 Å, c = 12.908 Å
α = 105.826°, β = 97.899°, γ = 103.385°
a:b:c = 0.842 : 1 : 1.254
Unit Cell V:
1053 ų
Crystals are variable in habit from blocky to spear-shaped and platy.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
12.24 Å(100)
9.50 Å(30)
8.99 Å(28)
8.25 Å(38)
The strongest four lines in the powder-diffraction pattern.

Occurrences of HughesiteHide

Paragenetic Mode(s):
•  Leaching

Type Occurrence of HughesiteHide

General Appearance of Type Material:
Hughesite occurs as crystalline druses on the sandstone walls, usually in organic-carbon-rich zones, of mine workings and on fracture surfaces at the Sunday mine, Gypsum Valley, San Miguel County, Slick Rock District, Colorado, USA
Place of Conservation of Type Material:
The holotype specimen, composed of numerous crystals on matrix, resides in the collection of the National Museum of Natural History of the Smithsonian Institution (NMNH #174253).
Geological Setting of Type Material:
Colorado Plateau, sandstone hosted, vanadium-uranium, roll front type deposit.
Associated Minerals at Type Locality:

Synonyms of HughesiteHide

Related Minerals - Nickel-Strunz Grouping (8th Edition)Hide

7/X.0-AlumoedtolliteK2NaCu5AlO2(AsO4)4Tric. 1 : P1

Other InformationHide

highly soluble in water, acetone and alcohol
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for HughesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schmidt, G. (2009). Triclinic Na 3 Al (V 10 O 28)• 22H 2 O, A new member of the pascoite group of minerals from the Sunday Mine, San Miguel Co., CO (MS thesis, Miami University).
Rakovan, J., Schmidt, G. Gunter, M., Nash, B., Marty, J, Kampf, A.R., and Wise, W.S. (2011) Hughesite Na3AlV10O28∙22H2O, a new member of the pascoite family of minerals from the Sunday Mine, San Miguel County, Colorado. Canadian Mineralogist, 49:1253-1265.

Internet Links for HughesiteHide

Localities for HughesiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Colorado
    • Montrose Co.
      • Bull Canyon Mining District
Kampf, A.R., Hughes, J.M., Marty, J., Nash, B.P., Chen, Yu-S., Steele, I.M. (2014) Bluestreakite, K4Mg2(V4+2V5+8O28)·14H2O, a new mixed-valence decavanadate mineral from the Bluestreak Mine, Montrose County, Colorado: crystal structure and descriptive mineralogy. Canadian Mineralogist. 52:1007-1018
    • San Miguel Co.
      • Slick Rock Mining District
Kampf, A. R., Plášil, J., Nash, B. P., & Marty, J. (2019). Ammoniomathesiusite, a new uranyl sulfate–vanadate mineral from the Burro mine, San Miguel County, Colorado, USA. Mineralogical Magazine, 83(1), 115-121.
Kampf, A.R., Hughes, J.M., Marty, J. & Nash, B. (2013) Wernerbaurite {[Ca(H2O)7]2(H2O)2(H3O)2}{V10O28}, and schindlerite, {[Na2(H2O)10](H3O)4}{V10O28}, the first hydronium-bearing decavanadate minerals. Canadian Mineralogist: 51: 297-312.
Rakovan, J., Schmidt, G. Gunter, M., Nash, B., Marty, J, Kampf, A.R., and Wise, W.S. (2011) Hughesite Na3AlV10O28∙22H2O, a new member of the pascoite family of minerals from the Sunday Mine, San Miguel County, Colorado. Canadian Mineralogist, 49:1253-1265.; Kampf, A.R., Hughes, J.M., Marty, J., Gunter, M.E., Nash, B. (2011): Rakovanite, Na3{H3[V10O28]}·15H2O, a new member of the pascoite family with a protonated decavanadate polyanion. Canadian Mineralogist: 49: 595-604.
      • Uravan Mining District
Collected by and in the collection of Brent Thorne. EDS analyzed by Bob Housley and PXRD analyzed by Tony Kampf.
  • Utah
    • Grand Co.
      • Thompsons Mining District
        • Yellow Cat Mesa
Kasatkin, A. V., Plasil, J., Pekov, I. V., Belakovskiy, D. I., Nestola, F., Cejka, J., ... & Thorne, B. (2015). Karpenkoite, Co3 (V2O7)(OH) 2· 2H2O, a cobalt analogue of martyite from the Little Eva mine, Grand County, Utah, USA. Journal of Geosciences, 60(4), 251-257.
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