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Lasalite

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Formula:
Na2Mg2(V10O28) · 20H2O
Colour:
yellow to yellow-orange
Lustre:
Adamantine
Hardness:
1
Specific Gravity:
2.38
Crystal System:
Monoclinic
Member of:
Name:
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.



Hide all sections | Show all sections

Classification of LasaliteHide

Approved
Approval Year:
2007
4.HC.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
C : [6]-Sorovanadates

Physical Properties of LasaliteHide

Adamantine
Transparency:
Transparent
Colour:
yellow to yellow-orange
Comment:
thin coatings on sandstone are brown.
Streak:
yellow
Hardness:
Tenacity:
Very brittle
Cleavage:
None Observed
Density:
2.38(2) g/cm3 (Measured)    2.362 g/cm3 (Calculated)

Optical Data of LasaliteHide

Type:
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
Dispersion:
strong r> v dispersion.
Pleochroism:
Visible
Comments:
X light greenish yellow, Y light yellow, Z light brown
Comments:
2V at 550 nm: 32(l), 589 nm: 43(l), and 650 nm: 53(l);

Chemical Properties of LasaliteHide

Formula:
Na2Mg2(V10O28) · 20H2O

Crystallography of LasaliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 23.9019(7) Å, b = 10.9993(3) Å, c = 17.0504(5) Å
β = 118.284°
Ratio:
a:b:c = 2.173 : 1 : 1.55
Unit Cell V:
3,947.44 ų (Calculated from Unit Cell)

Type Occurrence of LasaliteHide

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:

Synonyms of LasaliteHide

Other Language Names for LasaliteHide

Relationship of Lasalite to other SpeciesHide

Member of:
Other Members of this group:
HuemuliteNa4Mg(V10O28) · 24H2OTric.
HummeriteK2Mg2(V10O28) · 16H2OTric.
MagnesiopascoiteCa2Mg(V10O28) · 16H2OMon. 2/m : B2/m
PascoiteCa3(V10O28) · 17H2OMon. 2 : B2
RakovaniteNa3(H3V10O28) · 15H2OMon. 2/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Corvusite5 photos of Lasalite associated with Corvusite on mindat.org.
Pascoite3 photos of Lasalite associated with Pascoite on mindat.org.
Dickthomssenite2 photos of Lasalite associated with Dickthomssenite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.HC.05PascoiteCa3(V10O28) · 17H2OMon. 2 : B2
4.HC.05MagnesiopascoiteCa2Mg(V10O28) · 16H2OMon. 2/m : B2/m
4.HC.10HummeriteK2Mg2(V10O28) · 16H2OTric.
4.HC.15SherwooditeCa4.5(AlV4+2V5+12O40) · 28H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd

Other InformationHide

Notes:
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 LasaliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 LasaliteHide

Localities for LasaliteHide

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.
USA
 
  • 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.
      • Thompsons District (S. E. Thomsons)
        • 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.
    • San Juan Co.
      • La Sal District (Paradox Valley District)
        • La Sal
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.
        • Lion Canyon
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; Kampf A R, Hughes J M, Marty J, Nash B (2012) Postite, Mg(H2O)6Al2(OH)2(H2O)8(V10O28)·13H2O, a new mineral species from the La Sal Mining District, Utah: Crystal structure and descriptive mineralogy. The Canadian Mineralogist 50, 45-53
      • La Sal Quadrangle
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
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