Vanthoffite Mineral Data (original) (raw)

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

Click Here for Larger Vanthoffite Image in a New Browser Window Images:

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 - PrismaticH-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),

Click Here for Large Vanthoffite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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| | Fischer W , Hellner E , Acta Crystallographica , 17 (1964) p.1613-1613, Ueber die struktur des vanthoffits, Locality: synthetic | | ---------------------------------------------------------------------------------------------------------------------------------- |

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:

28.04.01.01 (28)Anhydrous Acid and Sulfates

(28.04)with miscellaneous formulae

(28.04.01)Dana Group

28.04.01.01 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
15 - WWW-MINCRYST

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Ask about Vanthoffite here :
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Print or Cut-and-Paste your Vanthoffite Specimen Label here :

Vanthoffite

Na6Mg(SO4)4
Dana No: 28.04.01.01 Strunz No: 07.AC.05
Locality:

Notes: