Kainite Mineral Data

Kainite Mineral Data +

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General Kainite Information

Chemical Formula:

MgSO4·KCl·3(H2O)

Composition:

Molecular Weight = 248.97 gm

Potassium 15.70 % K 18.92 % K₂O

Magnesium 9.76 % Mg 16.19 % MgO

Hydrogen 2.43 % H 21.71 % H₂O

Sulfur 12.88 % S 32.16 % SO₃

Chlorine 14.24 % Cl 14.24 % Cl

- % Cl -3.21 % -O=Cl₂

Oxygen 44.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg(SO₄)KCl·3(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1865

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the Greek kainos, meaning "contemporary."

Synonym:

ICSD 26003

PDF 25-660

Kainite Image

Images:

Kainite Szaibelyite

Comments: pale violet granular kainite intermixed with white ascharite (szaibelyite).
Location: Havesa, Empelde, Hannover, Niedersachsen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Kainite Crystallography

Axial Ratios:

a:b:c =1.215:1:0.5871

Cell Dimensions:

a = 19.72, b = 16.23, c = 9.53, Z = 16; beta = 94.92° V = 3,038.89 Den(Calc)= 2.18

Crystal System:

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

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

By Intensity(I/I_o): 7.372(1), 3.08(0.86), 7.771(0.83),

Forms:

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Forms: [ 0 1 0] [ 4 2 1] [ 4 2 1] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Robinson P D , Fang J H , Ohya Y , American Mineralogist , 57 (1972) p.1325-1332, The crystal structure of kainite

Physical Properties of Kainite

Cleavage:

[001] Good

Color:

Blue, Colorless, Violet, Gray, Gray blue.

Density:

2.1

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

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

Hardness:

3 - Calcite

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Kainite

Gladstone-Dale:

CI meas= 0.019 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2317,KPDmeas= 0.2405,KC= 0.2452

Optical Data:

Biaxial (-), a=1.494, b=1.505, g=1.516, bire=0.0220, 2V(Calc)=88, 2V(Meas)=90.

Calculated Properties of Kainite

Electron Density:

r_electron=2.13 gm/cc
note: r_Kainite=2.10 gm/cc.

Fermion Index

Fermion Index = 0.01096
Boson Index = 0.98904

Photoelectric:

PE_Kainite= 3.49 barns/electron
U=PE_Kainite x r_electron= 7.41 barns/cc.

Radioactivity:

GRapi = 229.33 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Kainite - barely detectable

Kainite Classification

Dana Class:

31.7.1.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.7)where (A+ B++)2 (XO4) Zq·x(H2O)

(31.7.1)Dana Group

31.7.1.1 Kainite MgSO4·KCl·3(H2O) C 2/m 2/m

Strunz Class:

VI/D.18-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.18 - Kainite - Natrochalcite series

VI/D.18-10 Kainite MgSO4·KCl·3(H2O) C 2/m 2/m

VI/D.18-20 Uklonskovite NaMg(SO4)F·2(H2O) P 2₁/m 2/m

VI/D.18-30 Natrochalcite NaCu2(SO4)2(OH)·(H2O) I2/m 2/m

VI/D.18-40 Vonbezingite Ca6Cu3(SO4)3(OH)12·2(H2O) P 2₁/c 2/m

Other Kainite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Kainite

MgSO4·KCl·3(H2O)
Dana No: 31.7.1.1 Strunz No: VI/D.18-10
Locality:

Notes: