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Kremersite Mineral Data
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General Kremersite Information
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 Chemical Formula: |
(NH4,K)2Fe+++Cl5•(H2O) |
| Composition: |
Molecular Weight = 297.73 gm |
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Potassium 6.57 % K 7.91 % K2O |
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Iron 18.76 % Fe 26.82 % Fe2O3 |
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Hydrogen 2.03 % H - % Calc as (NH4)2O |
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Hydrogen 0.68 % H 6.05 % H2O |
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Nitrogen 7.06 % N 13.12 % (NH4)2O |
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Chlorine 59.54 % Cl 59.54 % Cl |
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- %
Cl -13.43 % -O=Cl2 |
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Oxygen 5.37 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
(NH4)1.5K0.5Fe3+Cl5•(H2O) |
| Environment: |
Acidic fumaroles. |
| IMA Status: |
Valid Species (Pre-IMA) 1853 |
| Locality: |
Vesuvius, Italy and Mt. Etna, Sicily, Link to MinDat.org Location Data. |
| Name Origin: |
Named for Peter Kremers (1827-?), German chemist. |
| Name Pronunciation: |
Kremersite + Pronunciation  |
| Synonym: |
ICSD 200322 |
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PDF 28-734 |
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Kremersite Image |
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Images:
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Kremersite Crystallography
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| Axial Ratios: |
a:b:c =0.7178:1:0.5146 |
| Cell Dimensions: |
a = 9.803, b = 13.657, c = 7.028, Z = 4; V = 940.91 Den(Calc)= 2.10 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmnb |
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Physical Properties of Kremersite
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| Cleavage: |
{210} Perfect, {011} Perfect |
| Color: |
Brown red, Red, Orange. |
| Density: |
2.17 |
| Diaphaneity: |
Transparent to Translucent |
| Habit: |
Pseudo Octohedral - Crystals show an octohedral outline. |
| Habit: |
Water Soluble - Water soluble mineral. |
| Luster: |
Vitreous (Glassy) |
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Optical Properties of Kremersite
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| Optical Data: |
Biaxial (+), a=1.715, b=1.75, g=1.8, bire=0.0850, 2V(Calc)=82, 2V(Meas)=62. |
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Calculated Properties of Kremersite
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| Electron Density: |
Bulk Density (Electron Density)=2.07 gm/cc
note: Specific Gravity of Kremersite =2.10 gm/cc.
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| Fermion Index: |
Fermion Index = 0.07
Boson Index = 0.93 |
| Photoelectric: |
PEKremersite = 10.07 barns/electron
U=PEKremersite x relectron= 20.88 barns/cc.
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| Radioactivity: |
GRapi = 93.57 (Gamma Ray American Petroleum Institute Units)
Concentration of Kremersite per GRapi unit = 1.07 (%)
Estimated Radioactivity from Kremersite  - barely detectable
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Kremersite Classification
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| Dana Class: |
11.04.01.02 (11)Halide Complexes; Alumino-fluorides |
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(11.04)where (A)m B (X)5 � x(H2O) |
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(11.04.01)Dana Group |
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11.04.01.01 Erythrosiderite K2FeCl5•(H2O) P nma 2/m 2/m 2/m |
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11.04.01.02 Kremersite (NH4,K)2FeCl5•(H2O) Pmnb 2/m 2/m 2/m |
| Strunz Class: |
03.CJ.10 03 - HALIDES |
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03.C - Complex Halides |
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03.CJ -With MX6 complexes; M = Fe, Mn, Cu |
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03.CJ.10 Erythrosiderite K2FeCl5•(H2O) P nma 2/m 2/m 2/m |
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03.CJ.10 Kremersite (NH4,K)2FeCl5•(H2O) Pmnb 2/m 2/m 2/m |
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Other Kremersite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| 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 - 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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Print or Cut-and-Paste your Kremersite Specimen Label here :
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Kremersite
(NH4,K)2Fe+++Cl5•(H2O)
Dana No: 11.04.01.02 Strunz No: 03.CJ.10
Locality:
Notes:
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