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Hughesite

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About HughesiteHide

John Hughes
Formula:
Na3Al(V10O28)•22H2O
Colour:
orange to golden orange
Lustre:
Sub-Adamantine
Hardness:
1
Specific Gravity:
2.29 (Calculated)
Crystal System:
Triclinic
Name:
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

Approved
Approval Year:
2010
7/X.0-

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

Physical Properties of HughesiteHide

Sub-Adamantine
Transparency:
Transparent
Colour:
orange to golden orange
Streak:
yellow
Hardness:
Hardness Data:
Estimated
Cleavage:
Distinct/Good
one good direction of cleavage parallel to (001)
Fracture:
Irregular/Uneven
Density:
2.29 g/cm3 (Calculated)

Optical Data of HughesiteHide

Type:
Biaxial (-)
RI values:
nα = 1.698 nβ = 1.740 nγ = 1.770
2V:
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:
High
Dispersion:
strong dispersion, with r > v.
Comments:
pleochroic with X = Y light golden yellow, and Z dark golden yellow.

Chemical Properties of HughesiteHide

Formula:
Na3Al(V10O28)•22H2O
IMA Formula:
Na3AlV10O28 · 22H2O

Crystallography of HughesiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 8.668 Å, b = 10.295 Å, c = 12.908 Å
α = 105.826°, β = 97.899°, γ = 103.385°
Ratio:
a:b:c = 0.842 : 1 : 1.254
Unit Cell V:
1053 ų
Z:
1
Morphology:
Crystals are variable in habit from blocky to spear-shaped and platy.

X-Ray Powder DiffractionHide

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

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, role front type deposit.

Synonyms of HughesiteHide

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

7/X.0-0PushcharovskiteK0.6Cu18(AsO4)(HAsO4)10(H2AsO4)4(OH)9.6·18.6H2OTric.

Other InformationHide

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)
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

ⓘ - 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.
USA
 
  • Colorado
    • Montrose Co.
      • Bull Canyon 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 District
        • Gypsum Valley
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 District
Collected by and in the collection of Brent Thorne. EDS analyzed by Bob Housley and PXRD analyzed by Tony Kampf.
Mineral and/or Locality  
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