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Vanthoffite Mineral Data

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General Vanthoffite Information

Help on Chemical  Formula: Chemical Formula: Na6Mg(SO4)4
Help on Composition: Composition: Molecular Weight = 546.50 gm
   Sodium     25.24 %  Na   34.02 % Na2O
   Magnesium   4.45 %  Mg    7.38 % MgO
   Sulfur     23.47 %  S    58.60 % SO3
   Oxygen     46.84 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na6Mg(SO4)4
Help on Environment: Environment: Marine evaporite mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1902
Help on Locality: Locality: Wilhelmshall, Stassfurt region, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Jacobus Hendricus van't Hoff (1852-1911), Dutch physical chemist.
Help on Name Pronunciation: Name Pronunciation: Vanthoffite + Pronunciation Say VANTHOFFITE
Help on Synonym: Synonym: ICSD 16607
  PDF 29-1240

Vanthoffite Image

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Comments: Colorless to white fragment of vanthoffite.
Location: Berlepsch Mine, Stassfurt, Stassfurt Deposit, Saxony-Anhalt, Germany. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Vanthoffite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0629:1:0.8895
Help on Cell Dimensions: Cell Dimensions: a = 9.797, b = 9.217, c = 8.199, Z = 2; beta = 113.3° V = 679.98 Den(Calc)= 2.67
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.91(1), 3.43(0.95), 3.44(0.95),

Physical Properties of Vanthoffite

Help on Color: Color: Colorless.
Help on Density: Density: 2.694
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Friable - Loosley cohesive material that granulates with your fingers.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Vanthoffite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.183,KPDmeas= 0.1814,KC= 0.1831
Ncalc = 1.49
Help on Optical Data: Optical Data: Biaxial (-), a=1.488, b=1.489, g=1.489, bire=0.0010, 2V(Calc)=0, 2V(Meas)=84. Dispersion r < v weak.

Calculated Properties of Vanthoffite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.64 gm/cc
note: Specific Gravity of Vanthoffite =2.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0064325127
Boson Index = 0.9935674873
Help on Photoelectric: Photoelectric: PEVanthoffite = 1.92 barns/electron
U=PEVanthoffite x rElectron Density= 5.07 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Vanthoffite is Not Radioactive

Vanthoffite Classification

Help on  Dana Class: Dana Class: (28)Anhydrous Acid and Sulfates
  (28.04)with miscellaneous formulae
  (28.04.01)Dana Group Vanthoffite Na6Mg(SO4)4 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 07.AC.05 07 - SULFATES (SELENATES, TELLURATES)
  07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O
  07.AC -With medium-sized and large cations
07.AC.05 Vanthoffite Na6Mg(SO4)4 P 21/c 2/m

Other Vanthoffite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Vanthoffite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 07.AC.05





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