Mineralogy Database

Thenardite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Thenardite + Pronunciation Say THENARDITE
Help on Synonym: Synonym: ICSD 28056
  PDF 37-1465

Thenardite Image

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Comments: White thenardite on augite-nephelinite rock.
Location: BÃĪrenstein 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 - Dipyramidal H-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:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 0 1) ( 1 1 1) ( 0 1 1)

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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 Diaphaneity: Diaphaneity: 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 and Phosphorescent, Short UV=bright white, Long UV=bright white.
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
Ncalc = 1.49
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.

Calculated Properties of Thenardite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.65 gm/cc
note: Specific Gravity of Thenardite =2.69 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0019093767
Boson Index = 0.9980906233
Help on Photoelectric: Photoelectric: PEThenardite = 1.88 barns/electron
U=PEThenardite x rElectron Density= 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)Anhydrous Acid and Sulfates
  (28.02)(A+)2 XO4
  (28.02.03)Dana Group Thenardite Na2SO4 F ddd 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 07.AC.25 07 - SULFATES (SELENATES, TELLURATES)
  07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O
  07.AC -With medium-sized and large cations
07.AC.25 Thenardite Na2SO4 F ddd 2/m 2/m 2/m

Other Thenardite Information

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 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineral and Gemstone Kingdom
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
20 - YupRocks

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Dana No: Strunz No: 07.AC.25





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