Vanthoffite Mineral Data + 
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- 28.4.1.1 Vanthoffite Na6Mg(SO4)4 P 21/c 2/m
- VI/A.04-10 Vanthoffite Na6Mg(SO4)4 P 21/c 2/m
- VI/A.04-20 Yavapaiite KFe(SO4)2 C 2/m 2/m
General Vanthoffite Information |
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 Chemical Formula: |
Na6Mg(SO4)4 | ||
| 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 | |||
| Empirical Formula: |
Na6Mg(SO4)4 | ||
| Environment: |
Marine evaporite mineral. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1902 | ||
| Locality: |
Wilhelmshall, Stassfurt region, Germany. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Jacobus Hendricus van't Hoff (1852-1911), Dutch physical chemist. | ||
| Synonym: |
ICSD 16607 | ||
| PDF 29-1240 | |||
Vanthoffite Image | |||
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Images:
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Vanthoffite Crystallography |
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| Axial Ratios: |
a:b:c =1.0629:1:0.8895 | ||
| Cell Dimensions: |
a = 9.797, b = 9.217, c = 8.199, Z = 2; beta = 113.3° V = 679.98 Den(Calc)= 2.67 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.91(1), 3.43(0.95), 3.44(0.95), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Vanthoffite |
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| Color: |
Colorless. | ||
| Density: |
2.694 | ||
| Diaphaniety: |
Transparent | ||
| Fracture: |
Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments. | ||
| Habit: |
Friable - Loosley cohesive material that granulates with your fingers. | ||
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. | ||
| Hardness: |
3.5 - Copper Penny | ||
| Luster: |
Vitreous - Pearly | ||
| Streak: |
white | ||
Optical Properties of Vanthoffite |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=2.64 gm/cc |
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| Fermion Index |
Fermion Index = 0.00643 Boson Index = 0.99357 |
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| Photoelectric: |
PEVanthoffite = 1.92 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Vanthoffite is Not Radioactive |
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Vanthoffite Classification |
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| Dana Class: |
28.4.1.1 (28)Anhydrous Acid and Sulfates | ||
| (28.4)with miscellaneous formulae | |||
| (28.4.1)Dana Group | |||
| Strunz Class: |
VI/A.04-10 VI - Sulfates,Chromates,Molybdates and Tungstates | ||
| VI/A - Waterfree sulfates [SO4]2- without unfamiliar anions. cations of medium and very big size | |||
| VI/A.04 - Vanthoffite - Yavapaiite series | |||
Other Vanthoffite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Vanthoffite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris Search for Vanthoffite using: Visit our Advertisers for Vanthoffite : Translate Vanthoffite Mineral Data : Ask about Vanthoffite here : Print or Cut-and-Paste your Vanthoffite Specimen Label here :
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