Thenardite Mineral Data + Say THENARDITE


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General Thenardite Information

Help on Chemical  Formula: Chemical Formula: Na2SO4
Help on Composition: Composition: Molecular Weight = 142.04 gm
   Sodium  32.37 %  Na   43.63 % Na2O
   Sulfur  22.57 %  S    56.37 % SO3
   Oxygen  45.06 %  O
          ______        ______ 
          100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2(SO4)
Help on Environment: Environment: Non-marine evaporite deposits in arid climates and alteration of alkali-ignous rocks protected from water.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1826
Help on Locality: Locality: Espartinas salt lake, Aranjuez, Madrid prov., Spain Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the French chemist, Louis Jacques Thenard (1777-1826).
Help on Synonym: Synonym: ICSD 28056
  PDF 37-1465
 

Thenardite Image

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Thenardite

Comments: White thenardite on augite-nephelinite rock.
Location: B?renstein Quarry, Niederschlag, Oberwiesenthal, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Thenardite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7933:1:0.4759
Help on Cell Dimensions: Cell Dimensions: a = 9.75, b = 12.29, c = 5.85, Z = 8; V = 700.99 Den(Calc)= 2.69
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: F ddd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.783(1), 4.66(0.73), 3.178(0.51),
Help on Forms: Forms:

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Forms: [ 0 1 0] [ 1 0 1] [ 1 1 1] [ 0 1 1]

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Click Here for Large Thenardite Structure Window Crystal Structure:

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Hawthorne F C , Ferguson R B , The Canadian Mineralogist , 13 (1975) p.181-187, Anhydrous sulphates. I: Refinement of the crystal structure of celestite, with an appendix on the structure of thenardite

 

Physical Properties of Thenardite

Help on Cleavage: Cleavage: [010] Perfect
Help on Color: Color: White, Grayish white, Yellowish white, Reddish white, Brownish white.
Help on Density: Density: 2.67 - 2.7, Average = 2.68
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Thenardite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1774,KPDmeas= 0.1778,KC= 0.1827
Help on Optical Data: Optical Data: Biaxial (+), a=1.471, b=1.477, g=1.484, bire=0.0130, 2V(Calc)=86, 2V(Meas)=83. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.
 

Calculated Properties of Thenardite

Help on Electron Density: Electron Density:

relectron=2.65 gm/cc
note: rThenardite =2.69 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.0019
Boson Index = 0.9981
Help on Photoelectric: Photoelectric:

PEThenardite = 1.88 barns/electron
U=PEThenardite x relectron= 4.98 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Thenardite is Not Radioactive

 

Thenardite Classification

Help on  Dana Class: Dana Class: 28.2.3.1 (28)Anhydrous Acid and Sulfates
  (28.2)(A+)2 XO4
  (28.2.3)Dana Group
 
28.2.3.1 Thenardite Na2SO4 F ddd 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: VI/A.07-10 VI - Sulfates,Chromates,Molybdates and Tungstates
  VI/A - Waterfree sulfates [SO4]2- without unfamiliar anions. cations of very big size
  VI/A.07 - Thenardite - Mascagnite series
 
VI/A.07-10 Thenardite Na2SO4 F ddd 2/m 2/m 2/m
 
VI/A.07-20 Arcanite K2SO4 Pmcn 2/m 2/m 2/m
 
VI/A.07-30 Mascagnite (NH4)2SO4 P nma 2/m 2/m 2/m
 

Other Thenardite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Thenardite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 -Athena 6 - Crocoite.com Mineral Locations 7 - EUROmin Project 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (UofA) 11 -MinDAT 12 -MinMax(Deutsch) 13 -MinMax(English) 14 - Mineral and Gemstone Kingdom 15 -Mineralienatlas (Deutsch) 16 -QUT Mineral Atlas 17 - WWW-MINCRYST 18 - YupRocks 19 -École des Mines de Paris

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Thenardite

Na2SO4
Dana No: 28.2.3.1 Strunz No: VI/A.07-10
Locality:

 

Notes:

 

 
   
 
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