Mineralogy Database

Hexahydrite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Hexahydrite + Pronunciation Say HEXAHYDRITE
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 - Prismatic H-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),
 

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 Diaphaneity: Diaphaneity: 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: Non-fluorescent.
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
Ncalc = 1.44 - 1.45
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: Bulk Density (Electron Density)=1.81 gm/cc
note: Specific Gravity of Hexahydrite =1.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEHexahydrite = 1.21 barns/electron
U=PEHexahydrite x rElectron Density= 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: 29.06.08.01 (29)Hydrated Acid and Sulfates
  (29.06)where A XO4 � x(H2O)
  (29.06.08)Hexahydrite Group (Space Group: C2/c)
 
29.06.08.01 Hexahydrite MgSO4•6(H2O) A2/a 2/m
 
29.06.08.02 Bianchite (Zn,Fe)(SO4)•6(H2O) C 2/c 2/m
 
29.06.08.03 Ferrohexahydrite FeSO4•6(H2O) C 2/c 2/m
 
29.06.08.04 Nickelhexahydrite (Ni,Mg,Fe)(SO4)•6(H2O) C 2/c 2/m
 
29.06.08.05 Moorhouseite (Co,Ni,Mn)SO4•6(H2O) C 2/c 2/m
 
29.06.08.06 Chvaleticeite (Mn,Mg)SO4•6(H2O) C 2/c 2/m
Help on  Strunz Class: Strunz Class: 07.CB.25 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CB -With only medium-sized cations
 
07.CB.25 Bianchite (Zn,Fe)(SO4)•6(H2O) C 2/c 2/m
 
07.CB.25 Ferrohexahydrite FeSO4•6(H2O) C 2/c 2/m
 
07.CB.25 Chvaleticeite (Mn,Mg)SO4•6(H2O) C 2/c 2/m
 
07.CB.25 Hexahydrite MgSO4•6(H2O) A2/a 2/m
 
07.CB.25 Moorhouseite (Co,Ni,Mn)SO4•6(H2O) C 2/c 2/m
 
07.CB.25 Nickelhexahydrite (Ni,Mg,Fe)(SO4)•6(H2O) C 2/c 2/m
 

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 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Hexahydrite

MgSO4•6(H2O)
Dana No: 29.06.08.01 Strunz No: 07.CB.25
Locality:

 

Notes:

 

 
   
 


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