Ferrihydrite Mineral Data + 
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- 4.3.2.1 Akdalaite (Al2O3)4·(H2O) P 6122,P 61 6 2 2
- 4.3.2.2 Ferrihydrite Fe2O3·0.5(H2O) P 31c 3 2/m
- 4.3.2.3 IMA2004-051! 5(Al2O3)·H2O P 63mc
- IV/F.09-10 Akdalaite (Al2O3)4·(H2O) P 6122,P 61 6 2 2
- IV/F.09-20 Ferrihydrite Fe2O3·0.5(H2O) P 31c 3 2/m
General Ferrihydrite Information |
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 Chemical Formula: |
Fe+++2O3·0.5(H2O) | ||
| Composition: |
Molecular Weight = 168.70 gm | ||
| Iron 66.21 % Fe 94.66 % Fe2O3 | |||
| Hydrogen 0.60 % H 5.34 % H2O | |||
| Oxygen 33.19 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Fe3+2O3·0.5(H2O) | ||
| Environment: |
Secondary mineral in an oxidizing environment, strongly dependant on pH. | ||
| IMA Status: |
Approved IMA 1973 | ||
| Locality: |
Clara mine, Grube Clara, Germany Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the composition as a hydrated ferric iron compound. | ||
Search for Ferrihydrite Images | |||
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Images:
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Ferrihydrite Crystallography |
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| Axial Ratios: |
a:c = 1:3.17567 | ||
| Cell Dimensions: |
a = 2.96, c = 9.4, Z = 1; V = 71.33 Den(Calc)= 3.93 | ||
| Crystal System: |
Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 31c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.45(1), 1.97(0.6), 2.25(0.6), | ||
Physical Properties of Ferrihydrite |
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| Color: |
Yellow brown, Dark brown. | ||
| Density: |
3.8 | ||
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. | ||
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. | ||
| Streak: |
yellowish brown | ||
Optical Properties of Ferrihydrite |
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| Optical Data: |
NCalc= 2.24 - from Gladstone-Dale relationship (KC = 0.3163) where Ncalc=Dcalc*KC+1 NCalc= 2.2 - from Gladstone-Dale relationship (KC = 0.3163) where Ncalc=Dmeas*KC+1 |
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Calculated Properties of Ferrihydrite |
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| Electron Density: |
relectron=3.77 gm/cc |
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| Fermion Index |
Fermion Index = 0.01419 Boson Index = 0.98581 |
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| Photoelectric: |
PEFerrihydrite = 20.08 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ferrihydrite is Not Radioactive |
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Ferrihydrite Classification |
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| Dana Class: |
4.3.2.2 (4)Simple Oxides | ||
| (4.3)with a cation charge of 3+ (A+++2 O3) | |||
| (4.3.2)Dana Group | |||
| Strunz Class: |
IV/F.09-20 IV - Oxides | ||
| IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure | |||
| IV/F.09 - Akdalaite - Ferrihydrite series | |||
Other Ferrihydrite Information |
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Ferrihydrite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris Search for Ferrihydrite using: Visit our Advertisers for Ferrihydrite : Translate Ferrihydrite Mineral Data : Ask about Ferrihydrite here : Print or Cut-and-Paste your Ferrihydrite Specimen Label here :
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