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(Na,Ca)2+x(V5+,V4+)6O16 · 4H2O

Dark olive green to ...
Sub-Adamantine, Silky
1 - 2
Member of:
For the town of Grants, New Mexico, in the area of which it was discovered.
This page provides mineralogical data about Grantsite.

Classification of Grantsite


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

3 : Hydrated Normal Vanadium Oxysalts

21 : Vanadates (and vanadates with arsenate or phosphate)
2 : Vanadates of Mg, Ca, Sr or Ba

Physical Properties of Grantsite

Sub-Adamantine, Silky
Dark olive green to greenish black
Hardness (Mohs):
1 - 2
2.94(1) g/cm3 (Measured)    

Optical Data of Grantsite

Biaxial (-)
RI values:
nα = 1.820
Max Birefringence:
δ = 1.820
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of Grantsite

(Na,Ca)2+x(V5+,V4+)6O16 · 4H2O

IMA Formula:
(Na,Ca)2+x(V5+,V4+)6O16 · 4H2O
Elements listed in formula:

Crystallography of Grantsite

Crystal System:
Cell Parameters:
a = 12.429 Å, b = 3.604 Å, c = 17.542 Å
β = 95.33°
a:b:c = 3.449 : 1 : 4.867
Unit Cell Volume:
V 782.38 ų (Calculated from Unit Cell)
Aggregates, bladed crystals
Similar data for material from Golden Cycle mine: 12.41, 3.60, 17.54, 95.15
X-Ray Powder Diffraction Data:
12.4 (18)
8.74 (100)
4.37 (10)
3.606 (28)
3.008 (14)
2.869 (12)
2.280 (11)

Type Occurrence of Grantsite

Geological Setting of Type Material:
Oxidized "corvusite-type" vanadiferous uranium ores. In sandstones and limestone.

Relationship of Grantsite to other Species

Member of:
Other Members of Group:
Barnesite(Na,Ca)V6O16 · 3H2O
Hendersonite(Ca,Sr)1.3V6O16 · 6H2O
HewettiteCaV6O16 · 9H2O
MetahewettiteCaV6O16 · 3H2O
4.HG.05FervaniteFe43+V45+O16 · 5H2O
4.HG.10HuemuliteNa4Mg(V10O28) · 24H2O
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.45Barnesite(Na,Ca)V6O16 · 3H2O
4.HG.50Hendersonite(Ca,Sr)1.3V6O16 · 6H2O
4.HG.60LenobliteV24+O4 · 2H2O
4.HG.65SatpaeviteAl12V24+V65+O37 · 30H2O
21.2.1MetarossiteCa(V2O6) · 2H2O
21.2.3MetahewettiteCaV6O16 · 3H2O
21.2.4HewettiteCaV6O16 · 9H2O
21.2.5PintadoiteCa2(V2O7) · 9H2O
21.2.6Hendersonite(Ca,Sr)1.3V6O16 · 6H2O
21.2.7Fernandinite(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O
21.2.8PascoiteCa3(V10O28) · 17H2O
21.2.9SherwooditeCa4.5(AlV24+V125+O40) · 28H2O
21.2.10MelanovanaditeCa(V5+,V4+)4O10 · 5H2O
21.2.12HummeriteK2Mg2(V10O28) · 16H2O
21.2.14DelrioiteCaSr(V2O6)(OH)2 · 3H2O
21.2.15Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2O

Other Names for Grantsite

Name in Other Languages:

Other Information

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 Grantsite

Reference List:
Weeks, A.D., Lindberg, M.L., Truesdell, A.H., and Meyrowitz, R. (1964): Grantsite, a new hydrated sodium calcium vanadate from New Mexico, Colorado and Utah. American Mineralogist 49, 1511-1526.

Evans, Jr., H.T., and Hughes, J.M. (1990): Crystal chemistry of the natural vanadium bronzes. American Mineralogist 75, 508-521.

Internet Links for Grantsite URL:
Please feel free to link to this page.

Localities for Grantsite

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.
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District slag localities
        • Agios Konstantinos [St Constantine] (Kamariza)
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (II). Mineralien-Welt 25 (2), 82-95 (in German).; 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.
  • Colorado
    • Montrose Co.
      • Uravan District
Minerals of Colorado (1997) Eckels, E. B.; Am Min (1964) 49:1511-1526
Minerals of Colorado (1997) Eckels, E. B.; Am Min (1964) 49:1511-1526
  • New Mexico
    • Cibola Co.
      • Grants District
Minerals of New Mexico 3rd ed.; Am Min (1964) 49:1511-1526
    • McKinley Co.
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
        • Ambrosia Lake Sub-district
Jeff Weismann
  • Utah
    • Grand Co.
      • Thompsons District (S. E. Thomsons)
        • Yellow Cat Mesa
          • Parco Mine Group
[UGMS Bull 117 Minerals and Mineral Localities of Utah; Am Min (1964) 49:1511-1526
Van King
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