Hexahydrite Mineral Data + Say HEXAHYDRITE


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General Hexahydrite Information

Help on Chemical  Formula: Chemical Formula: MgSO4·6(H2O)
Help on Composition: Composition: Molecular Weight = 228.46 gm
   Magnesium  10.64 %  Mg   17.64 % MgO
   Hydrogen    5.29 %  H    47.31 % H2O
   Sulfur     14.04 %  S    35.05 % SO3
   Oxygen     70.03 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg(SO4)·6(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1911
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the number of water molecules hexa, "six" and hydor, "water."
Help on Synonym: Synonym: Bitter Salt
  ICSD 16546
  Magnesium Sulphate
  PDF 24-719
 

Hexahydrite Image

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Hexahydrite

Comments: White fibrous mats and powdery encrustation of hexahydrite on matrix.
Location: near Basque, Bonaparte River, British Columbia, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hexahydrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.3871:1:1.4023
Help on Cell Dimensions: Cell Dimensions: a = 24.442, b = 7.216, c = 10.119, Z = 8; beta = 98.28° V = 1,766.12 Den(Calc)= 1.72
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.39(1), 5.45(0.5), 5.1(0.45),
Click Here for Large Hexahydrite Structure Window Crystal Structure:

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Zalkin A , Ruben H , Templeton D H , Acta Crystallographica , 17 (1964) p.235-240, The crystal structure and hydrogen bonding of magnesium sulfate hexahydrate, Locality: synthetic

 

Physical Properties of Hexahydrite

Help on Cleavage: Cleavage: [010] Perfect, [101] Distinct
Help on Color: Color: Colorless, White, Greenish white.
Help on Density: Density: 1.76
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Hexahydrite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2587,KPDmeas= 0.2528,KC= 0.2582
Help on Optical Data: Optical Data: Biaxial (-), a=1.426, b=1.453, g=1.456, bire=0.0300, 2V(Calc)=36, 2V(Meas)=38. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
 

Calculated Properties of Hexahydrite

Help on Electron Density: Electron Density:

relectron=1.81 gm/cc
note: rHexahydrite =1.72 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01203
Boson Index = 0.98797
Help on Photoelectric: Photoelectric:

PEHexahydrite = 1.21 barns/electron
U=PEHexahydrite x relectron= 2.19 barns/cc.

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

Hexahydrite is Not Radioactive

 

Hexahydrite Classification

Help on  Dana Class: Dana Class: 29.6.8.1 (29)Hydrated Acid and Sulfates
  (29.6)where A XO4 · x(H2O)
  (29.6.8)Hexahydrite Group (Space Group: C2/c)
 
29.6.8.1 Hexahydrite MgSO4·6(H2O) A2/a 2/m
 
29.6.8.2 Bianchite (Zn,Fe)(SO4)·6(H2O) C 2/c 2/m
 
29.6.8.3 Ferrohexahydrite FeSO4·6(H2O) C 2/c 2/m
 
29.6.8.4 Nickelhexahydrite (Ni,Mg,Fe)(SO4)·6(H2O) C 2/c 2/m
 
29.6.8.5 Moorhouseite (Co,Ni,Mn)SO4·6(H2O) C 2/c 2/m
 
29.6.8.6 Chvaleticeite (Mn,Mg)SO4·6(H2O) C 2/c 2/m
Help on  Strunz Class: Strunz Class: VI/C.05-10 VI - Sulfates,Chromates,Molybdates and Tungstates
  VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size
  VI/C.05 - Hexahydrite group
 
VI/C.05-10 Hexahydrite MgSO4·6(H2O) A2/a 2/m
 
VI/C.05-20 Ferrohexahydrite FeSO4·6(H2O) C 2/c 2/m
 
VI/C.05-30 Chvaleticeite (Mn,Mg)SO4·6(H2O) C 2/c 2/m
 
VI/C.05-40 Moorhouseite (Co,Ni,Mn)SO4·6(H2O) C 2/c 2/m
 
VI/C.05-50 Nickelhexahydrite (Ni,Mg,Fe)(SO4)·6(H2O) C 2/c 2/m
 
VI/C.05-60 Bianchite (Zn,Fe)(SO4)·6(H2O) C 2/c 2/m
 
VI/C.05-70 Retgersite NiSO4·6(H2O) P 41212,P 43212 4 2 2
 

Other Hexahydrite Information

Help on References: References: NAME( Mason68) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Hexahydrite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 - Franklin Minerals(Dunn) 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST 15 -École des Mines de Paris

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Print or Cut-and-Paste your Hexahydrite Specimen Label here :

Hexahydrite

MgSO4·6(H2O)
Dana No: 29.6.8.1 Strunz No: VI/C.05-10
Locality:

 

Notes:

 

 
   
 
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