Hydrohematite
A variety of Hematite
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Formula:
Fe2-x(OH)xO3-x
Originally considered as a hydrated hematite, Fe2O3.nH2O, based on specimens from Bavaria and Prussia having ~5 wt% H2O (Breithaupt, 1847).
A crystal-structure study by Wolska (1981) showed the presence of OH groups and suggested the formula Fe2-x(OH)xO3-x.
A modern study by Peterson et al. (2015) of synthetic “hydrohematite” precipitated hydrothermally at 200°C, suggested monoclinic-pseudorhombohedral symmetry.
According to Peterson et al. (2015), some researchers have argued that water and OH-group substitution can generate two distinct iron-deficient hematite structures, commonly referred to as “protohematite” and “hydrohematite”, with the general formula Fe2-x/3(OH)xO3-x (Wolska and Schwertmann, 1989; Dang et al., 1998). The OH-content, x, distinguishes these compounds: For 1 ≤ x < 0.5, the phase is classified as “protohematite”, whereas “hydrohematite” has a lesser degree of OH-substitution, with 0.5 ≤ x < 0.
See also turgite and protohematite.
A crystal-structure study by Wolska (1981) showed the presence of OH groups and suggested the formula Fe2-x(OH)xO3-x.
A modern study by Peterson et al. (2015) of synthetic “hydrohematite” precipitated hydrothermally at 200°C, suggested monoclinic-pseudorhombohedral symmetry.
According to Peterson et al. (2015), some researchers have argued that water and OH-group substitution can generate two distinct iron-deficient hematite structures, commonly referred to as “protohematite” and “hydrohematite”, with the general formula Fe2-x/3(OH)xO3-x (Wolska and Schwertmann, 1989; Dang et al., 1998). The OH-content, x, distinguishes these compounds: For 1 ≤ x < 0.5, the phase is classified as “protohematite”, whereas “hydrohematite” has a lesser degree of OH-substitution, with 0.5 ≤ x < 0.
See also turgite and protohematite.
Unique Identifiers
Mindat ID:
1976 (as Hydrohematite)
1856 (as Hematite)
1856 (as Hematite)
Long-form identifier:
mindat:1:1:1976:3 (as Hydrohematite)
mindat:1:1:1856:8 (as Hematite)
mindat:1:1:1856:8 (as Hematite)
Similar Names
| Hydrohämatit | A synonym of Goethite |
Chemistry of Hydrohematite
Mindat Formula:
Fe2-x(OH)xO3-x
Elements listed:
Other Language Names for Hydrohematite
German:Hydrohematit
Spanish:Hydrohematita
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 Hydrohematite
mindat.org URL:
https://www.mindat.org/min-1976.html
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References for Hydrohematite
Reference List:
Peterson, K. M., Heaney, P. J., Post, J. E., Eng, P. J. (2015) A refined monoclinic structure for a variety of "hydrohematite". American Mineralogist, 100 (2) 570-579 doi:10.2138/am-2015-4807[with history of "turgite", "hydrohematite" and "protohematite"]
Localities for Hydrohematite
Showing 9 localities.
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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.
China | |
| Wang et al. (2022) |
Cuba | |
| Costafreda et al. (2024) |
Russia | |
| Moseychuk et al. (2013) |
| Volkov et al. (2015) |
| Priymenko et al. (2022) |
| Savva et al. (2014, June) | |
| |
Serbia | |
| Mineco Limited |
Tajikistan | |
| Badalov et al. (1975) |
