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Na2Mg2(V10O28) · 20H2O
yellow to yellow-orange
Member of:
For the type locality.
It is identical in all respects to pascoite and other members of that group, and can only be distinguished by X-ray diffraction or chemical methods.

Classification of Lasalite

Approval Year:

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
C : [6]-Sorovanadates URL:
Please feel free to link to this page.

Type Occurrence of Lasalite

General Appearance of Type Material:
efflorescent crusts are commonly 1 to 3 mm thick. The surfaces of the crusts may be rounded owing to dissolution, but may also glisten from exposed crystal faces. Some sandstone surfaces are coated with isolated single crystals 1 to 2 mm in length
Place of Conservation of Type Material:
Smithsonian Museum, Washington, D.C., USA (catalog number NMNH-174744).
Geological Setting of Type Material:
Lasalite occurs in efflorescences on the sandstone walls of the mine workings and along fractures in the sandstone. The mineral forms by oxidation of the primary vanadium oxide bronze phase (corvusite) by vadose water and reaction with dolomite and calcite cement of the host sandstone.
Associated Minerals at Type Locality:

Physical Properties of Lasalite

Diaphaneity (Transparency):
yellow to yellow-orange
thin coatings on sandstone are brown.
Hardness (Mohs):
Very brittle
None Observed
2.38(2) g/cm3 (Measured)    2.362 g/cm3 (Calculated)

Crystallography of Lasalite

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Space Group Setting:
Cell Parameters:
a = 23.9019(7) Å, b = 10.9993(3) Å, c = 17.0504(5) Å
β = 118.284°
a:b:c = 2.173 : 1 : 1.55
Unit Cell Volume:
V 3,947.44 ų (Calculated from Unit Cell)

Optical Data of Lasalite

Biaxial (-)
RI values:
nα = 1.743(5) nβ = 1.773(5) nγ = 1.780(5)
Max Birefringence:
δ = 0.037
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
strong r> v dispersion.
X light greenish yellow, Y light yellow, Z light brown
2V at 550 nm: 32(l), 589 nm: 43(l), and 650 nm: 53(l);

Chemical Properties of Lasalite

Na2Mg2(V10O28) · 20H2O
All elements listed in formula:

Relationship of Lasalite to other Species

Member of:
Other Members of Group:
HuemuliteNa4Mg(V10O28) · 24H2O
HummeriteK2Mg2(V10O28) · 16H2O
MagnesiopascoiteCa2Mg(V10O28) · 16H2O
PascoiteCa3(V10O28) · 17H2O
RakovaniteNa3(H3V10O28) · 15H2O
4.HC.05PascoiteCa3(V10O28) · 17H2O
4.HC.05MagnesiopascoiteCa2Mg(V10O28) · 16H2O
4.HC.10HummeriteK2Mg2(V10O28) · 16H2O
4.HC.15SherwooditeCa4.5(AlV24+V125+O40) · 28H2O

Other Names for Lasalite

Name in Other Languages:

Other Information

Other Information:
On prolonged exposure to conditions of low humidity, the crystals dehydrate to a yellow powder
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 Lasalite

Reference List:
Hughes, J.M., Wise, W.S., Gunter, M.E., Morton, J.P., Rakovan, J. (2008): Lasalite, Na2Mg2(V10O28)•20H2O, a new decavanadate mineral from the Vanadium Queen mine, La Sal District, Utah: description, atomic arrangement, and relationship to the pascoite group of minerals. Canadian Mineralogist, 46, 1365-1372.

Hughes, J.M., Wise, W.S., Gunter, M.E., Morton, J.P., Rakovan, J. (2009): Lasalite, Na2Mg2(V10O28)•20H2O, a new decavanadate mineral from the Vanadium Queen mine, La Sal District, Utah: description, atomic arrangement, and relationship to the pascoite group of minerals. Addendum. Canadian Mineralogist, 47, 206.

Internet Links for Lasalite

Localities for Lasalite

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.
  • Colorado
    • Mesa Co.
      • Gateway District
        • Gateway
Kampf, A.R., Nash, B.P., Marty, J., Hughes, J.M. (2016): Mesaite, CaMn2+5(V2O7)3·12H2O, a new vanadate mineral from the Packrat mine, near Gateway, Mesa County, Colorado, USA. Mineralogical Magazine: 80: (in press)
  • Utah
    • Grand Co.
      • Yellow Cat District (W. part of Thompsons District)
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.
    • San Juan Co.
      • La Sal District (Paradox Valley District)
        • La Sal
Can Mineral 2009 47: 206
        • Lyon Canyon Creek
Canadian Mineralogist 46,687-692(2008)
      • La Sal Quadrangle
Tom Loomis specimen
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