Krausite Mineral Data

Krausite Mineral Data +

General Krausite Information

Chemical Formula:

KFe+++(SO4)2·(H2O)

Composition:

Molecular Weight = 305.09 gm

Potassium 12.82 % K 15.44 % K₂O

Iron 18.31 % Fe 26.17 % Fe₂O₃

Hydrogen 0.66 % H 5.90 % H₂O

Sulfur 21.02 % S 52.49 % SO₃

Oxygen 47.20 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KFe³⁺(SO₄)₂·(H₂O)

Environment:

Hydrothermally altered rocks.

IMA Status:

Valid Species (Pre-IMA) 1931

Locality:

Sulfur Hole, near Borate Camp, Mule Canyon, Calico Mountains, San Bernardino Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for Edward Henry Krous (1875-1973), American mineralogist, University of Michigan.

Synonym:

ICSD 201732

PDF 18-1028

Krausite Image

Images:

Krausite

Comments: Pale yellowish crystals of krausite on black matrix.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 1.7 mm.
© Thomas Witzke / Abraxas-Verlag

Krausite Crystallography

Axial Ratios:

a:b:c =1.539:1:1.7516

Cell Dimensions:

a = 7.92, b = 5.146, c = 9.014, Z = 2; beta = 102.76° V = 358.30 Den(Calc)= 2.83

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 3.09(1), 4.4(0.74), 6.59(0.66),

Forms:

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

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Crystal Structure:

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Graeber E J , Morosin B , Rosenzweig A , American Mineralogist , 50 (1965) p.1929-1936, The crystal structure of krausite, KFe(SO4)2.H2O

View Additional jPOWD Structure files for Krausite
[1]

Physical Properties of Krausite

Cleavage:

[001] Perfect, [100] Good

Color:

Yellow green, Light yellow, Lemon.

Density:

2.84

Diaphaniety:

Transparent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Krausite

Gladstone-Dale:

CI meas= -0.019 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2309,KPDmeas= 0.23,KC= 0.2257

Optical Data:

Biaxial (+), a=1.588, b=1.65, g=1.722, bire=0.1340, 2V(Calc)=90, 2V(Meas)=70-90. Dispersion large.

Pleochroism (x):

colorless.

Pleochroism (y):

pale yellow.

Pleochroism (z):

pale yellow.

Calculated Properties of Krausite

Electron Density:

r_electron=2.81 gm/cc
note: r_Krausite=2.84 gm/cc.

Fermion Index

Fermion Index = 0.0057
Boson Index = 0.9943

Photoelectric:

PE_Krausite= 7.96 barns/electron
U=PE_Krausite x r_electron= 22.39 barns/cc.

Radioactivity:

GRapi = 183.03 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Krausite - barely detectable

Krausite Classification

Dana Class:

29.5.1.1 (29)Hydrated Acid and Sulfates

(29.5)where A B (XO4)2 · x(H2O)

(29.5.1)Dana Group

29.5.1.1 Krausite KFe(SO4)2·(H2O) P 2₁/m 2/m

Strunz Class:

VI/C.15-10 VI - Sulfates,Chromates,Molybdates and Tungstates

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

VI/C.15 - Krausite - Amarillite series

VI/C.15-10 Krausite KFe(SO4)2·(H2O) P 2₁/m 2/m

VI/C.15-20 Tamarugite NaAl(SO4)2·6(H2O) P 2₁/a 2/m

VI/C.15-30 Amarillite NaFe(SO4)2·6(H2O) C 2/c 2/m

Other Krausite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Krausite :
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

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Krausite

KFe+++(SO4)2·(H2O)
Dana No: 29.5.1.1 Strunz No: VI/C.15-10
Locality:

Notes: