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Mohrite

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Karl Friedrich Mohr
Formula:
(NH4)2Fe(SO4)2 · 6H2O
System:
Monoclinic
Colour:
Pale green to colorless
Hardness:
2 - 2½
Name:
For Karl Friedrich Mohr (1806-1879), Professor of Chemistry in the University of Bonn, Germany, after whom the synthetic compound was named.

Classification of Mohrite

Approved
7.CC.60

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
29.3.7.1

29 : HYDRATED ACID AND NORMAL SULFATES
3 : A2B(XO4)2·xH2O
25.11.16

25 : Sulphates
11 : Sulphates of Fe and other metals
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http://www.mindat.org/min-2742.html
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Type Occurrence of Mohrite

Year of Discovery:
1964

Occurrences of Mohrite

Geological Setting:
Boriferous fumaroles and geysers.

Physical Properties of Mohrite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Pale green to colorless
Hardness (Mohs):
2 - 2½
Cleavage:
Perfect
Perfect on {102}
Distinct on {010}
Density:
1.800 - 1.862 g/cm3 (Measured)    1.838(32) g/cm3 (Calculated)

Crystallography of Mohrite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group Setting:
P21/c
Cell Parameters:
a = 6.24(1) Å, b = 12.65(2) Å, c = 9.32(2) Å
β = 106.79°
Ratio:
a:b:c = 0.493 : 1 : 0.737
Unit Cell Volume:
V 704.32 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Subhedral crystals, irregular lamellae
Comment:
Synthetic

Optical Data of Mohrite

Type:
Biaxial (+)
RI values:
nα = 1.480 - 1.486 nγ = 1.486 - 1.497
2V:
Measured: 65° to 75°
Max Birefringence:
δ = 0.006 - 0.011
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong

Chemical Properties of Mohrite

Formula:
(NH4)2Fe(SO4)2 · 6H2O
Essential elements:
All elements listed in formula:

Relationship of Mohrite to other Species

Series:
Forms a series with Boussingaultite (see here)
Other Members of Group:
Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
CyanochroiteK2Cu(SO4)2 · 6H2O
Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
NickelpicromeriteK2Ni(SO4)2•6H2O
PicromeriteK2Mg(SO4)2 · 6H2O
7.CC.05KrausiteKFe(SO4)2 · H2O
7.CC.10TamarugiteNaAl(SO4)2 · 6H2O
7.CC.15KaliniteKAl(SO4)2 · 11H2O Not confirmed
7.CC.15MendoziteNaAl(SO4)2 · 11H2O
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2O
7.CC.20Alum-(K)KAl(SO4)2 · 12H2O
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2O
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2O
7.CC.25VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
7.CC.25ZincovoltaiteK2Zn5Fe33+Al(SO4)12 · 18H2O
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe23+Al(SO4)12 · 18H2O
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg52+Fe33+Al(SO4)12 · 18H2O
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2O
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2O
7.CC.40GoldichiteKFe(SO4)2 · 4H2O
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2O
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2O
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.50ChangoiteNa2Zn(SO4)2 · 4H2O
7.CC.50Zincblödite
7.CC.55LeoniteK2Mg(SO4)2 · 4H2O
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2O
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
7.CC.60CyanochroiteK2Cu(SO4)2 · 6H2O
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2O
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2O
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2O
7.CC.75AmarilliteNaFe(SO4)2 · 6H2O
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2O
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)
25.11.1NatrojarositeNaFe3(SO4)2(OH)6
25.11.2SideronatriteNa2Fe(SO4)2(OH) · 3H2O
25.11.3MetasideronatriteNa2Fe(SO4)2(OH) · H2O
25.11.4FerrinatriteNa3Fe(SO4)3 · 3H2O
25.11.5AmarilliteNaFe(SO4)2 · 6H2O
25.11.6YavapaiiteKFe(SO4)2
25.11.7KrausiteKFe(SO4)2 · H2O
25.11.8GoldichiteKFe(SO4)2 · 4H2O
25.11.9JarositeKFe3+ 3(SO4)2(OH)6
25.11.10VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
25.11.11UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2O
25.11.12MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2O
25.11.13Sabieite(NH4)Fe3+(SO4)2
25.11.14Ammoniojarosite(NH4)Fe33+(SO4)2(OH)6
25.11.15Clairite(NH4)2Fe3(SO4)4(OH)3 · 3H2O
25.11.17Lonecreekite(NH4)Fe3+(SO4)2 · 12H2O
25.11.18Godovikovite(NH4)Al(SO4)2
25.11.19BotryogenMgFe3+(SO4)2(OH) · 7H2O
25.11.21Slavíkite(H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2O
25.11.23SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2O
25.11.24Millosevichite(Al,Fe)2(SO4)3
25.11.25AluminocopiapiteAl2/3Fe43+(SO4)6(OH)2 · 20H2O
25.11.26HalotrichiteFeAl2(SO4)4 · 22H2O
25.11.27Idrizite(Mg,Fe)(Al,Fe)2(SO4)3(OH)2 · 15H2O or near
25.11.28LishizheniteZnFe2(SO4)4 · 14H2O
25.11.29ZincovoltaiteK2Zn5Fe33+Al(SO4)12 · 18H2O

Other Names for Mohrite

Name in Other Languages:
German:Mohrit
Simplified Chinese:六水铵铁矾
Spanish:Mohrita
Traditional Chinese:六水銨鐵礬

Other Information

Other Information:
Soluble in water
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Mohrite

Reference List:
Garavelli, C. L. (1964): Mohrite, a new mineral in the boriferous Tuscan area. Atti Accad. Nazl. Lincei, Rend., Classe Sci. Fis., Mat. Nat., 36, 524-533. (in Italian).

American Mineralogist (1965): 50: 805.

Acta Crystallographica: 22: 775-780.

Internet Links for Mohrite

Localities for Mohrite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth, L. (2007): Secondary minerals associated with sulfides at Mont Saint-Hilaire. Micronews, 41(1), 7-9.
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Hradec Králové Region
      • Trutnov (Trautenau)
        • Radvanice
Jirásek, J.: Thermal Changes of the Rocks in the Dump Pile of the Kateřina Colliery in Radvanice (Eastern Bohemia). Ostrava: VSB – Technical University of Ostrava, Institute of Geological Engineering - 541, 2001. 69 p.
    • Karlovy Vary Region
      • Horní Slavkov (Schlaggenwald)
Plašil J, Sejkora J, Ondruš P, Veselovský F, Beran P, Goliáš V (2006): Supergene minerals in the Horní Slavkov uranium ore district, Czech Republic. Journal of the Czech Geological Society 51, 149-158.
        • Krásno (Schönfeld)
Sejkora, J., Ondruš, P., Fikar, M., Veselovský, F., Mach, Z., Gabašová, A., Skoda, R. & Beran, P. (2006): Supergene minerals at the Huber stock and Schnöd stock deposits, Krásno ore District, the Slavkovský les area, Czech Republic. Journal of the Czech Geological Society 51, 57-101.
    • Liberec Region
Scharm, B.: Přehled minerálů nalezených v oblasti uranových koncentrací v severočeské křídě. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1995, roč. 3, s. 169-172.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
Hungary
 
  • Baranya Co.
    • Mecsek Mts
      • Komló
Geoda 2007/1
      • Pécs
Szakáll, S. & Kristály, F. (2008): Ammonium sulphates from burning coal dumps at Komló and Pécs-Vasas, Mecsek Mts., South Hungary. Mineralogia, Special Papers, Vol. 32 (2nd Central-European Mineralogical Conference 2008 (CEMC)), 154.
Italy (TL)
 
  • Tuscany
    • Grosseto Province
      • Montieri
Garavelli, C. L. (1964): Mohrite, a new mineral in the boriferous Tuscan area. Atti Accad. Nazl. Lincei, Rend., Classe Sci. Fis., Mat. Nat., 36, 524-533. (in Italian)
New Zealand
 
  • North Island
    • Manawatu-Wanganui
      • Tongariro National Park
Johnstone, R. D. 1979, Fumarole Incrustations and Some Aspects of the Thermal Alteration at Ketetahi, Mount Tongariro, New Zealand. Geothermal Institute, University of Auckland, New Zealand
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
Mineral and/or Locality  
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