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Huemulite

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Formula:
Na4Mg(V10O28) · 24H2O
System:
Triclinic
Colour:
Yellowish orange to ...
Lustre:
Adamantine, Sub-Adamantine, Vitreous, Sub-Vitreous, Dull
Hardness:
2½ - 3
Member of:
Name:
Named in 1966 by C. E. Gordillo, E. Linares, R. O. Toubes, and Horace Winchell for one of the type localities: Huemul Mine, Mendoza Province, Argentina.
Easily soluble in water.


Classification of Huemulite

Approved
4.HG.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
G : Unclassified V oxides
47.2.3.1

47 : VANADIUM OXYSALTS
2 : Anhydrous Vanadium Oxysalts Containing Hydroxyl or Halogen
21.1.6

21 : Vanadates (and vanadates with arsenate or phosphate)
1 : Vanadates of the alkalis and Cu

Physical Properties of Huemulite

Adamantine, Sub-Adamantine, Vitreous, Sub-Vitreous, Dull
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Natural fine-grained material is dull
Colour:
Yellowish orange to orange
Streak:
Yellow
Hardness (Mohs):
2½ - 3
Tenacity:
Brittle
Cleavage:
Perfect
{001} perfect; {010} good
Density:
2.39(5) g/cm3 (Measured)    2.404 g/cm3 (Calculated)

Optical Data of Huemulite

Type:
Biaxial (-)
RI values:
nα = 1.679(3) nβ = 1.734(3) nγ = 1.742(2)
2V:
Measured: 20° to 25°, Calculated: 40°
Birefringence:
0.063
Max Birefringence:
δ = 0.063
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v strong
Pleochroism:
Visible
Comments:
X= light yellow
Y= golden yellow
Z= yellowish orange

Chemical Properties of Huemulite

Formula:
Na4Mg(V10O28) · 24H2O
IMA Formula:
Na4MgV105+O28 · 24H2O
Elements listed in formula:

Crystallography of Huemulite

Crystal System:
Triclinic
Cell Parameters:
a = 11.770 Å, b = 11.838 Å, c = 9.018(9) Å
α = 107.2°, β = 112.2°, γ = 101.5°
Ratio:
a:b:c = 0.994 : 1 : 0.762
Unit Cell Volume:
V 1,040.32 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Synthetic crystals are pseudohexagonal elongated along a
X-Ray Powder Diffraction Data:
d-spacingIntensity
10.59 (90)
10.20 (55)
9.12 (60)
8.22 (35)
7.62 (100)
6.07 (15)
5.26 (25)
3.956 (20)
3.795 (25)
3.054 (30)
2.833 (35)
Comments:
Am. Min. 51:8

Type Occurrence of Huemulite

General Appearance of Type Material:
Fibrous crusts and films, also fine-grained granular
Place of Conservation of Type Material:
Smithsonian Museum 120076
Geological Setting of Type Material:
A post-mining mineral derived from Cu-U sandstone/conglomerate deposits.
Associated Minerals at Type Locality:

Relationship of Huemulite to other Species

Member of:
Other Members of Group:
HummeriteK2Mg2(V10O28) · 16H2O
LasaliteNa2Mg2(V10O28) · 20H2O
MagnesiopascoiteCa2Mg(V10O28) · 16H2O
PascoiteCa3(V10O28) · 17H2O
RakovaniteNa3(H3V10O28) · 15H2O
4.HG.CalciodelrioiteCa(VO3)2·4H2O
4.HG.05FervaniteFe43+V45+O16 · 5H2O
4.HG.15VanaliteNaAl8V10O38 · 30H2O
4.HG.20SimplotiteCaV44+O9 · 5H2O
4.HG.25VanoxiteV44+V25+O13 · 8H2O
4.HG.30NavajoiteFe3+V95+O24 · 12H2O
4.HG.35DelrioiteCaSr(V2O6)(OH)2 · 3H2O
4.HG.40MetadelrioiteCaSr(V2O6)(OH)2
4.HG.45Barnesite(Na,Ca)V6O16 · 3H2O
4.HG.50Hendersonite(Ca,Sr)1.3V6O16 · 6H2O
4.HG.55Grantsite(Na,Ca)2+x(V5+,V4+)6O16 · 4H2O
4.HG.60LenobliteV24+O4 · 2H2O
4.HG.65SatpaeviteAl12V24+V65+O37 · 30H2O
21.1.1MetamuniriteNaVO3
21.1.2MuniriteNaVO3 · 1.9H2O
21.1.3Barnesite(Na,Ca)V6O16 · 3H2O
21.1.4Bannermanite(Na,K)0.7V4+0.7V5+5.3O15
21.1.5HowardevansiteNaCuFe2(VO4)3
21.1.7Blossiteα-Cu2(V2O7)
21.1.8Ziesiteβ-Cu2(V2O7)
21.1.9StoiberiteCu5(VO4)2O2
21.1.10McbirneyiteCu3(VO4)2
21.1.11FingeriteCu11(VO4)6O2
21.1.12VolborthiteCu3(V2O7)(OH)2 · 2H2O
21.1.13TangeiteCaCu(VO4)(OH)
21.1.14VésigniéiteBaCu3(VO4)2(OH)2
21.1.15LyonsiteCu3Fe4(VO4)6

Other Names for Huemulite

Name in Other Languages:
German:Huemulit
Spanish:Huemulita

Other Information

Not fluorescent in UV
Thermal Behaviour:
Melts at 500 C.
Other Information:
Soluble in water. Most properties measured on recrystallized material.
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 Huemulite

Reference List:
American Mineralogist: 51: 1-13.

Colombo, B., Baggio, R., and Kampf, A.R. (2011): The crystal structure of the elusive huemulite. Canadian Mineralogist 49, 849-864.

Internet Links for Huemulite

mindat.org URL:
https://www.mindat.org/min-1941.html
Please feel free to link to this page.
Specimens:
The following Huemulite specimens are currently listed for sale on minfind.com.

Localities for Huemulite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Argentina
 
  • Mendoza
    • Malargüe Department
      • Pampa Amarilla District
        • Agua Botada
J.W. Anthony, R.A. Bideaux, K.W. Bladh, M.C. Nichols: Handbook of Mineralogy, Vol. III (1997)
J.W. Anthony, R.A. Bideaux, K.W. Bladh, M.C. Nichols: Handbook of Mineralogy, Vol. III (1997)
Gordillo, C.E., E. Linares, R.O. Toubes, H. Winchell (1966) American Mineralogist: 51: 1-13.
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
Josef Vajdak (2008) Mineral News, 24, #3, 15.
        • Háje
Lapis 7-8/2003
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District slag localities
        • Agios Konstantinos [St Constantine] (Kamariza)
Gunnar Färber (identification method not given); Stephan Wolfsried collection; Koshlyakova, N.N., Zubkova, N.V., Pekov, I.V., Giester, G., Pushcharovsky, D.Yu., Chukanov, N.V., Voudouris, P., Magganas, A., Katerinopoulos, A. (2016): Crystal chemistry of a Ni-Mg-analogue of lyonsite from slags of Lavrion, Greece. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry 193, 113-120.
UK
 
  • England
    • Devon
      • East Devon
        • Budleigh Salterton
Brian Craik-Smith collection (NHM London XRD ID)
USA
 
  • Colorado
    • Montrose Co.
      • Bull Canyon District
Anthony R. Kampf, John M. Hughes, Joe Marty, Barbara P. Nash, Yu-Sheng Chen, and Ian M. Steele (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. Can Mineral 52:1007-1018; Kampf, A. R., Marty, J., Nash, B. P., Plášil, J., Kasatkin, A. V., & Škoda, R. (2012). Calciodelrioite, Ca (VO3) 2 (H2O) 4, the Ca analogue of delrioite, Sr (VO3) 2 (H2O) 4. Mineralogical Magazine, 76(7), 2803-2817.
    • San Miguel Co.
      • Slick Rock District
        • Gypsum Valley
Collected by and in the collection of Joe Marty. p-XRD analayzed by Tony Kampf.
Kampf, A.R., Marty, J., Nash, B.P., Plášil, J., Kasatkin, A.V., Škoda, R. (2012): Calciodelrioite, Ca(VO3)2(H2O)4, the Ca analogue of delrioite, Sr(VO3)2(H2O)4. Mineralogical Magazine, 76, 2803-2817.
      • Uravan District
Collected by and in the collection of Brent Thorne. EDS analyzed by Bob Housley and PXRD analyzed by Tony Kampf.
  • Nevada
    • Eureka Co.
      • Fish Creek District
NBMG Spec. Pub. 31 Minerals of Nevada
      • Gibellini District
        • Fish Creek Range
Rocks & Minerals, Nov. 1999
NBMG Spec. Pub. 31 Minerals of Nevada
Frost, R.L., K.L. Erickson, M.L. Weier, and O. Carmody, Raman and infrared spectroscopy of selected vanadates. Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy, 2005. 61A(5): p. 829-834.
  • Utah
    • Grand Co.
      • Thompsons District (S. E. Thomsons)
        • D-Day Mine group
Pavel M. Kartashov analytical data 2015
        • Yellow Cat Mesa
Kasatkin, A.V., Plášil, J., Marty, J., Belakovskiy, D.I., Lykova, I.S. (2014): Nestolaite, CaSeO3·H2O, a new mineral from the Little Eva mine, Grand County, Utah, USA. Mineralogical Magazine, 78, 497-505.
Mineral and/or Locality  
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