Kremersite Mineral Data + 
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- 11.4.1.1 Erythrosiderite K2FeCl5·(H2O) P nma 2/m 2/m 2/m
- 11.4.1.2 Kremersite (NH4,K)2FeCl5·(H2O) Pmnb 2/m 2/m 2/m
- III/C.07-10 Mitscherlichite K2CuCl4·2(H2O) P 41/mnm 4/m 2/m 2/m
- III/C.07-20 Douglasite K2FeCl4·2(H2O) Unk. Mono
- III/C.07-30 Erythrosiderite K2FeCl5·(H2O) P nma 2/m 2/m 2/m
- III/C.07-40 Kremersite (NH4,K)2FeCl5·(H2O) Pmnb 2/m 2/m 2/m
General Kremersite Information |
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 Chemical Formula: |
(NH4,K)2Fe+++Cl5·(H2O) | ||
| 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 | |||
| 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. | ||
| Synonym: |
ICSD 200322 | ||
| PDF 28-734 | |||
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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmnb | ||
Physical Properties of Kremersite |
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| Cleavage: |
[210] Perfect, [011] Perfect | ||
| Color: |
Brown red, Red, Orange. | ||
| Density: |
2.17 | ||
| Diaphaniety: |
Transparent to Translucent | ||
| Habit: |
Pseudo Octohedral - Crystals show an octohedral outline. | ||
| Habit: |
Water Soluble - Water soluble mineral. | ||
| Luster: |
Vitreous (Glassy) | ||
Optical Properties of Kremersite |
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| Gladstone-Dale: |
CI meas= -0.127 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.165 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.3595,KPDmeas= 0.3479,KC= 0.3087 |
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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. | ||
Calculated Properties of Kremersite |
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| Electron Density: |
relectron=2.14 gm/cc |
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| Fermion Index |
Fermion Index = 0.07432 Boson Index = 0.92568 |
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| Photoelectric: |
PEKremersite = 10.07 barns/electron |
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| Radioactivity: |
GRapi = 93.53 (Gamma Ray American Petroleum Institute Units) Estimated Radioactivity from Kremersite |
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Kremersite Classification |
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| Dana Class: |
11.4.1.2 (11)Halide Complexes; Alumino-fluorides | ||
| (11.4)where (A)m B (X)5 · x(H2O) | |||
| (11.4.1)Dana Group | |||
| Strunz Class: |
III/C.07-40 III - Halogenides | ||
| III/C - Double halogenides with water, Chlorides | |||
| III/C.07 - Rinneite - Kremersite series | |||
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 -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 -École des Mines de Paris Search for Kremersite using: Visit our Advertisers for Kremersite : Translate Kremersite Mineral Data : Ask about Kremersite here : Print or Cut-and-Paste your Kremersite Specimen Label here :
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