Mineralogy Database

Krausite Mineral Data

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General Krausite Information

Help on Chemical  Formula: Chemical Formula: KFe+++(SO4)2•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: KFe3+(SO4)2•(H2O)
Help on Environment: Environment: Hydrothermally altered rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1931
Help on Locality: Locality: Sulfur Hole, near Borate Camp, Mule Canyon, Calico Mountains, San Bernardino Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Edward Henry Krous (1875-1973), American mineralogist, University of Michigan.
Help on Name Pronunciation: Name Pronunciation: Krausite Say KRAUSITE
Help on Synonym: Synonym: ICSD 201732
  PDF 18-1028

Krausite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.539:1:1.7516
Help on Cell Dimensions: Cell Dimensions: a = 7.92, b = 5.146, c = 9.014, Z = 2; beta = 102.76° V = 358.30 Den(Calc)= 2.83
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.09(1), 4.4(0.74), 6.59(0.66),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 0 2) ( 1 1 2) ( 1 1 0) ( 1 0 1) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Krausite

Help on Cleavage: Cleavage: {001} Perfect, {100} Good
Help on Color: Color: Yellow green, Light yellow, Lemon.
Help on Density: Density: 2.84
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Krausite

Help on Gladstone-Dale: 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
Ncalc = 1.64
Help on Optical Data: Optical Data: Biaxial (+), a=1.588, b=1.65, g=1.722, bire=0.1340, 2V(Calc)=90, 2V(Meas)=70-90. Dispersion large.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): pale yellow.
Help on Pleochroism (z): Pleochroism (z): pale yellow.

Calculated Properties of Krausite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.81 gm/cc
note: Specific Gravity of Krausite =2.84 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0057001889
Boson Index = 0.9942998111
Help on Photoelectric: Photoelectric: PEKrausite = 7.96 barns/electron
U=PEKrausite x relectron= 22.39 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 183.03 (Gamma Ray American Petroleum Institute Units)
Concentration of Krausite per GRapi unit = 0.55 (%)

Estimated Radioactivity from Krausite - barely detectable


Krausite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.05)where A B (XO4)2 � x(H2O)
  (29.05.01)Dana Group Krausite KFe(SO4)2•(H2O) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 07.CC.05 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CC -With medium-sized and large cations
07.CC.05 Krausite KFe(SO4)2•(H2O) P 21/m 2/m

Other Krausite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Krausite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 07.CC.05





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