Lasalite Mineral Data

General Lasalite Information

Chemical Formula:

Na2Mg2(V10O28)•20H2O

Composition:

Molecular Weight = 1,404.31 gm

Potassium 0.39 % K 0.47 % K₂O

Sodium 3.01 % Na 4.06 % Na₂O

Calcium 1.26 % Ca 1.76 % CaO

Magnesium 3.27 % Mg 5.42 % MgO

Vanadium 34.64 % V 61.84 % V₂O₅

Hydrogen 2.67 % H 23.87 % H₂O

Sulfur 1.03 % S 2.57 % SO₃

Oxygen 53.73 % O

______ ______

100.00 % 99.99 % = TOTAL OXIDE

Empirical Formula:

Na_1.84Ca_0.44K_0.14Mg_1.89V⁵⁺_9.55S_0.45O_28.55(H₂O)_18.61

Environment:

Secondary mineral that form from the oxidation of vanadium orebodies in sedimentary rocks.

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Vanadium Queen mine, 18 km east of La Sal, San Juan County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

IMA2007-005

Lasalite Image

Images:

Lasalite

Comments: Bright orange efflorescent lasalite crust on sandstone.
Location: Vanadium Queen mine, San Juan Co., Utah, USA. Scale: Picture Size 2 x 2 cm.
© Tom Loomis / Dakota Matrix

Images:

Lasalite

Comments: Lasalite crystals on sandstone surface. (CanMin, v46:1365).
Location: Vanadium Queen mine, 18 km east of La Sal, San Juan County, Utah, USA. Scale: Picture size 3 mm.
© Joe Marty/Canadian Mineralogist

Lasalite Crystallography

Axial Ratios:

a:b:c =2.173:1:1.5501

Cell Dimensions:

a = 23.9019, b = 10.9993, c = 17.0504, Z = 4; beta = 118.284° V = 3,947.44 Den(Calc)= 2.36

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.72(1), 6.67(0.8), 7.42(0.7),8.19(0.6), 9.09(0.6), 1.861(0.5), 2.706(0.5), 2.882(0.5),

Physical Properties of Lasalite

Cleavage:

None

Color:

Yellow, Yellow orange.

Density:

2.38

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Efflorescences - Crystals covering matrix, generally produced from transpiro-evaporation.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

1 - Talc

Luster:

Vitreous (Glassy)

Streak:

yellow

Optical Properties of Lasalite

Gladstone-Dale:

CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3243,KPDmeas= 0.3216,KC= 0.3192
Ncalc = 1.75 - 1.76

Optical Data:

Biaxial (-), a=1.743, b=1.773, g=1.78, bire=0.0370

Calculated Properties of Lasalite

Electron Density:

Bulk Density (Electron Density)=2.36 gm/cc
note: Specific Gravity of Lasalite =2.38 gm/cc.

Fermion Index:

Fermion Index = 0.0044935548
Boson Index = 0.9955064452

Photoelectric:

PE_Lasalite= 6.89 barns/electron
U=PE_Lasalite x r_electron= 16.26 barns/cc.

Radioactivity:

GRapi = 5.57 (Gamma Ray American Petroleum Institute Units)
Concentration of Lasalite per GRapi unit = 17.96 (%)

Estimated Radioactivity from Lasalite - barely detectable

Lasalite Classification

Dana Class:

47.02.07.01 (47)Vanadium Oxysalts

(47.02)(VmOn)

(47.02.07)Dana Group

47.02.07.01 Lasalite! Na2Mg2(V10O28)•20H2O C 2/c 2/m

Strunz Class:

04.HC.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.H - V[5,6] Vanadates

04.HC -[6]-Sorovanadates

04.HC.05 Pascoite Ca3V10O28•17(H2O) C 2/m 2/m

04.HC.05 Magnesiopascoite! Ca2Mg[V10O28]•16H2O C 2/m 2/m

04.HC.05 Lasalite! Na2Mg2(V10O28)•20H2O C 2/c 2/m

Other Lasalite Information

References:

NAME( CanMin, v46:1365) PHYS. PROP.(CanMin, v46:1365) OPTIC PROP.(CanMin, v46:1365)

See Also:

Links to other databases for Lasalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Lasalite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Lasalite :

Ask about Lasalite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Lasalite Specimen Label here :

Lasalite

Na2Mg2(V10O28)•20H2O
Dana No: 47.02.07.01 Strunz No: 04.HC.05
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.