Kieserite Mineral Data

Kieserite Mineral Data +

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General Kieserite Information

Chemical Formula:

MgSO4·(H2O)

Composition:

Molecular Weight = 138.38 gm

Magnesium 17.56 % Mg 29.13 % MgO

Hydrogen 1.46 % H 13.02 % H₂O

Sulfur 23.17 % S 57.86 % SO₃

Oxygen 57.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg(SO₄)·(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1860

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after D. G. Kieserr. President of the Academy in Jena, Germany (1770-1826).

Synonym:

ICSD 68345

PDF 33-882

Kieserite Image

Images:

Kieserite

Comments: Translucent crystalline mass of kieserite with white alteration products.
Location: Stassfurt, Sachsen-Anhalt, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Kieserite Crystallography

Axial Ratios:

a:b:c =0.8949:1:0.9779

Cell Dimensions:

a = 6.9, b = 7.71, c = 7.54, Z = 4; beta = 116.17° V = 360.00 Den(Calc)= 2.55

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.409(1), 3.331(0.9), 4.84(0.9),

Forms:

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Crystal Structure:

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Hawthorne F C , Groat L A , Raudsepp M , Ercit T S , Neues Jahrbuch fur Mineralogie, Abhandlungen , 157 (1987) p.121-132, Kieserite, Mg(SO4)(H2O), a titanite-group mineral, Locality: Wathlingen, Hanover, Germany

Physical Properties of Kieserite

Cleavage:

[110] Perfect, [111] Perfect

Color:

Colorless, Green yellow, Gray white, Yellowish, White.

Density:

2.57

Diaphaniety:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Kieserite

Gladstone-Dale:

CI meas= -0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.214,KPDmeas= 0.2123,KC= 0.2049

Optical Data:

Biaxial (+), a=1.52, b=1.533, g=1.584, bire=0.0640, 2V(Calc)=56, 2V(Meas)=55.

Calculated Properties of Kieserite

Electron Density:

r_electron=2.60 gm/cc
note: r_Kieserite=2.57 gm/cc.

Fermion Index

Fermion Index = 0.01958
Boson Index = 0.98042

Photoelectric:

PE_Kieserite= 1.82 barns/electron
U=PE_Kieserite x r_electron= 4.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kieserite is Not Radioactive

Kieserite Classification

Dana Class:

29.6.2.1 (29)Hydrated Acid and Sulfates

(29.6)where A XO4 · x(H2O)

(29.6.2)Kieserite Group (Mono-hydrates)

29.6.2.1 Kieserite MgSO4·(H2O) C 2/c 2/m

29.6.2.2 Szomolnokite FeSO4·(H2O) A2/a 2/m

29.6.2.3 Szmikite MnSO4·(H2O) A2/a 2/m

29.6.2.4 Poitevinite (Cu,Fe,Zn)SO4·(H2O) P1 1

29.6.2.5 Gunningite (Zn,Mn)SO4·(H2O) A2/a 2/m

29.6.2.6 Dwornikite (Ni,Fe)SO4·(H2O) C 2/c 2/m

29.6.2.7 Cobaltkieserite! CoSO4·H2O C 2/c 2/m

Strunz Class:

VI/C.01-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size

VI/C.01 - Kieserite group

VI/C.01-10 Kieserite MgSO4·(H2O) C 2/c 2/m

VI/C.01-20 Szomolnokite FeSO4·(H2O) A2/a 2/m

VI/C.01-30 Szmikite MnSO4·(H2O) A2/a 2/m

VI/C.01-35 Cobaltkieserite! CoSO4·H2O C 2/c 2/m

VI/C.01-40 Dwornikite (Ni,Fe)SO4·(H2O) C 2/c 2/m

VI/C.01-50 Poitevinite (Cu,Fe,Zn)SO4·(H2O) P1 1

VI/C.01-60 Gunningite (Zn,Mn)SO4·(H2O) A2/a 2/m

VI/C.01-70 Sanderite MgSO4·2(H2O) Mono ? Mono

Other Kieserite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Kieserite

MgSO4·(H2O)
Dana No: 29.6.2.1 Strunz No: VI/C.01-10
Locality:

Notes: