UM1985-08-OH:Fe
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Formula:
Fe3+O(OH)
Previously ε-FeOOH
Crystal System:
Monoclinic
Polymorph of:
Isostructural with:
Synthetic material (90 kB, 400oC) was first reported by Bendeliani et al. (1972).
Later found in ferruginous black shale, more narrowly its soft, poorly laminated and very fine-grained variety (Ostwald, 1985). Associates include quartz and illite. The unnamed FeOOH occupies at least of 40% of the shale volume.
Later found in ferruginous black shale, more narrowly its soft, poorly laminated and very fine-grained variety (Ostwald, 1985). Associates include quartz and illite. The unnamed FeOOH occupies at least of 40% of the shale volume.
Unique Identifiers
Mindat ID:
47824
Long-form identifier:
mindat:1:1:47824:3
Chemistry of UM1985-08-OH:Fe
Mindat Formula:
Fe3+O(OH)
Previously ε-FeOOH
Previously ε-FeOOH
Elements listed:
Crystallography of UM1985-08-OH:Fe
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 8.721 Å, b = 5.164 Å, c = 5.680 Å
β = 90°
β = 90°
Ratio:
a:b:c = 1.689 : 1 : 1.1
Unit Cell V:
255.80 ų (Calculated from Unit Cell)
Comment:
synthetic material
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.49 Å | (s) |
| 2.22 Å | (m) |
| 1.69 Å | (m) |
| 1.65 Å | (w) |
Comments:
comparable to reflections of the synthetic phase (3.335, 2.56, 2.488, 2.22, 2.162, 1.750, 1.689, 1.655, 1.541, 1.50, 1.447, 1.369)
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for UM1985-08-OH:Fe
mindat.org URL:
https://www.mindat.org/min-47824.html
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Please feel free to link to this page.
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References for UM1985-08-OH:Fe
Localities for UM1985-08-OH:Fe
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| Ostwald (1985) |
