Kremersite Mineral Data

Kremersite Mineral Data
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General Kremersite Information

Help on Chemical Formula: Chemical Formula: (NH4,K)2Fe+++Cl5•(H2O)
Help on Composition: Composition: Molecular Weight = 297.73 gm
   Potassium   6.57 %  K     7.91 % K2O
   Iron       18.76 %  Fe   26.82 % Fe2O3
   Hydrogen    2.03 %  H      -   % Calc as (NH4)2O
   Hydrogen    0.68 %  H     6.05 % H2O
   Nitrogen    7.06 %  N    13.12 % (NH4)2O
   Chlorine   59.54 %  Cl   59.54 % Cl
                -   %   Cl  -13.43 % -O=Cl2   
   Oxygen      5.37 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)1.5K0.5Fe3+Cl5•(H2O)
Help on Environment: Environment: Acidic fumaroles.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1853
Help on Locality: Locality: Vesuvius, Italy and Mt. Etna, Sicily, Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Peter Kremers (1827-?), German chemist.
Help on Name Pronunciation: Name Pronunciation: Kremersite + Pronunciation Say KREMERSITE
Help on Synonym: Synonym: ICSD 200322
  PDF 28-734
 

Kremersite Image

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Kremersite

Comments: Orange crystals of kremersite.
Location: Anna Mine, Alsdorf, Aachen, North Rhine-Westphalia, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Kremersite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.7178:1:0.5146
Help on Cell Dimensions: Cell Dimensions: a = 9.803, b = 13.657, c = 7.028, Z = 4; V = 940.91 Den(Calc)= 2.10
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmnb
Click Here for Large Kremersite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Figgis B N , Raston C L , Sharma R P , White A H , Australian Journal of Chemistry , 31 (1978) p.2717-2720, Crystal structure of diammonium aquapentachloroferrate(III), Locality: synthetic

 

Physical Properties of Kremersite

Help on Cleavage: Cleavage: {210} Perfect, {011} Perfect
Help on Color: Color: Brown red, Red, Orange.
Help on Density: Density: 2.17
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Pseudo Octohedral - Crystals show an octohedral outline.
Help on Habit: Habit: Water Soluble - Water soluble mineral.
Help on Luster: Luster: Vitreous (Glassy)
 

Optical Properties of Kremersite

Help on Optical Data: Optical Data: Biaxial (+), a=1.715, b=1.75, g=1.8, bire=0.0850, 2V(Calc)=82, 2V(Meas)=62.
 

Calculated Properties of Kremersite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.07 gm/cc
note: Specific Gravity of Kremersite =2.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEKremersite = 10.07 barns/electron
U=PEKremersite x relectron= 20.88 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 93.57 (Gamma Ray American Petroleum Institute Units)
Concentration of Kremersite per GRapi unit = 1.07 (%)

Estimated Radioactivity from Kremersite - barely detectable

 

Kremersite Classification
Help on Dana Class: Dana Class: 11.04.01.02 (11)Halide Complexes; Alumino-fluorides
  (11.04)where (A)m B (X)5 · x(H2O)
  (11.04.01)Dana Group
 
11.04.01.01 Erythrosiderite K2FeCl5•(H2O) P nma 2/m 2/m 2/m
 
11.04.01.02 Kremersite (NH4,K)2FeCl5•(H2O) Pmnb 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 03.CJ.10 03 - HALIDES
  03.C - Complex Halides
  03.CJ -With MX6 complexes; M = Fe, Mn, Cu
 
03.CJ.10 Erythrosiderite K2FeCl5•(H2O) P nma 2/m 2/m 2/m
 
03.CJ.10 Kremersite (NH4,K)2FeCl5•(H2O) Pmnb 2/m 2/m 2/m
 

Other Kremersite Information
Help on References: References: NAME( Dana8) 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 Kremersite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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Kremersite

(NH4,K)2Fe+++Cl5•(H2O)
Dana No: 11.04.01.02 Strunz No: 03.CJ.10
Locality:

 

Notes: