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Mohrite

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Formula:
(NH
 
4
)
 
2
Fe(SO
 
4
)
 
2
· 6H
 
2
O
System:MonoclinicColour:Pale green to colorless
Hardness:2 - 2½
Member of:Picromerite Group
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

IMA status:Approved
Strunz 8th edition ID:6/C.19-50
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:29.3.7.1

29 : HYDRATED ACID AND NORMAL SULFATES
3 : A2B(XO4)2·xH2O
Hey's CIM Ref.:25.11.16

25 : Sulphates
11 : Sulphates of Fe and other metals
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Type Occurrence of Mohrite

Type Locality:Travale, Montieri, Grosseto Province, Tuscany, Italy
Year of Discovery:1964

Occurrences of Mohrite

Geological Setting:Boriferous fumaroles and geysers.

Physical Properties of Mohrite

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

Crystallography of Mohrite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
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°
Maximum Birefringence:δ = 0.006 - 0.011

Chart 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:
(NH
 
4
)
 
2
Fe(SO
 
4
)
 
2
· 6H
 
2
O
Simplified for copy/paste:(NH4)2Fe(SO4)2·6H2O
Essential elements:Fe, H, N, O, S
All elements listed in formula:Fe, H, N, O, S

Relationship of Mohrite to other Species

Series:Forms a series with Boussingaultite (see here)
Member of:Picromerite Group
Other Members of Group:

- +
Boussingaultite
(NH
 
4
)
 
2
Mg(SO
 
4
)
 
2
· 6H
 
2
O
Cyanochroite
K
 
2
Cu(SO
 
4
)
 
2
· 6H
 
2
O
Nickelboussingaultite
(NH
 
4
)
 
2
Ni(SO
 
4
)
 
2
· 6H
 
2
O
Nickelpicromerite
K
 
2
Ni(SO
 
4
)
 
2
•6H
 
2
O
Picromerite
K
 
2
Mg(SO
 
4
)
 
2
· 6H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
7.CC.05Krausite
KFe(SO
 
4
)
 
2
· H
 
2
O
7.CC.10Tamarugite
NaAl(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.15Kalinite
KAl(SO
 
4
)
 
2
· 11H
 
2
O Not confirmed
7.CC.15Mendozite
NaAl(SO
 
4
)
 
2
· 11H
 
2
O
7.CC.20Lonecreekite
(NH
 
4
)Fe
3+
 
(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Alum-(K)
KAl(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Alum-(Na)
NaAl(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Tschermigite
(NH
 
4
)Al(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Lanmuchangite
Tl
+
 
Al(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.25Voltaite
K
 
2
Fe
2+
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.25Zincovoltaite
K
 
2
Zn
 
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.25Pertlikite
K
 
2
(Fe
2+
 
,Mg)
 
2
Mg
 
4
Fe
3+
2
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.25Ammoniomagnesiovoltaite
(NH
 
4
)
 
2
Mg
2+
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.30Kröhnkite
Na
 
2
Cu(SO
 
4
)
 
2
· 2H
 
2
O
7.CC.35Ferrinatrite
Na
 
3
Fe(SO
 
4
)
 
3
· 3H
 
2
O
7.CC.40Goldichite
KFe(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.45Löweite
Na
 
12
Mg
 
7
(SO
 
4
)
 
13
· 15H
 
2
O
7.CC.50Blödite
Na
 
2
Mg(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.50Nickelblödite
Na
 
2
(Ni,Mg)(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.50Changoite
Na
 
2
Zn(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.50Zincblödite
7.CC.55Leonite
K
 
2
Mg(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.55Mereiterite
K
 
2
Fe(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.60Boussingaultite
(NH
 
4
)
 
2
Mg(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Cyanochroite
K
 
2
Cu(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Nickelboussingaultite
(NH
 
4
)
 
2
Ni(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Picromerite
K
 
2
Mg(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.65Polyhalite
K
 
2
Ca
 
2
Mg(SO
 
4
)
 
4
· 2H
 
2
O
7.CC.70Leightonite
K
 
2
Ca
 
2
Cu(SO
 
4
)
 
4
· 2H
 
2
O
7.CC.75Amarillite
NaFe(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.80Konyaite
Na
 
2
Mg(SO
 
4
)
 
2
· 5H
 
2
O
7.CC.85Wattevilleite
Na
 
2
Ca(SO
 
4
)
 
2
· 4H
 
2
O (?)
Related Minerals - Hey's Index Grouping:

- +
25.11.1Natrojarosite
NaFe
 
3
(SO
 
4
)
 
2
(OH)
 
6
25.11.2Sideronatrite
Na
 
2
Fe(SO
 
4
)
 
2
(OH) · 3H
 
2
O
25.11.3Metasideronatrite
Na
 
2
Fe(SO
 
4
)
 
2
(OH) · H
 
2
O
25.11.4Ferrinatrite
Na
 
3
Fe(SO
 
4
)
 
3
· 3H
 
2
O
25.11.5Amarillite
NaFe(SO
 
4
)
 
2
· 6H
 
2
O
25.11.6Yavapaiite
KFe(SO
 
4
)
 
2
25.11.7Krausite
KFe(SO
 
4
)
 
2
· H
 
2
O
25.11.8Goldichite
KFe(SO
 
4
)
 
2
· 4H
 
2
O
25.11.9Jarosite
KFe
3+
 
 
3
(SO
 
4
)
 
2
(OH)
 
6
25.11.10Voltaite
K
 
2
Fe
2+
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O
25.11.11Ungemachite
K
 
3
Na
 
8
Fe(SO
 
4
)
 
6
(NO
 
3
)
 
2
· 6H
 
2
O
25.11.12Metavoltine
Na
 
6
K
 
2
FeFe
 
6
(SO
 
4
)
 
12
O
 
2
· 18H
 
2
O
25.11.13Sabieite
(NH
 
4
)Fe
3+
 
(SO
 
4
)
 
2
25.11.14Ammoniojarosite
(NH
 
4
)Fe
3+
3
(SO
 
4
)
 
2
(OH)
 
6
25.11.15Clairite
(NH
 
4
)
 
2
Fe
 
3
(SO
 
4
)
 
4
(OH)
 
3
· 3H
 
2
O
25.11.17Lonecreekite
(NH
 
4
)Fe
3+
 
(SO
 
4
)
 
2
· 12H
 
2
O
25.11.18Godovikovite
(NH
 
4
)Al(SO
 
4
)
 
2
25.11.19Botryogen
MgFe
3+
 
(SO
 
4
)
 
2
(OH) · 7H
 
2
O
25.11.21Slavíkite
(H
 
3
O
+
 
)
 
3
Mg
 
6
Fe
 
15
(SO
 
4
)
 
21
(OH)
 
18
· 98H
 
2
O
25.11.23Sturmanite
Ca
 
6
(Fe
3+
 
,Al,Mn
3+
 
)
 
2
(SO
 
4
)
 
2
[B(OH)
 
4
](OH)
 
12
· 25H
 
2
O
25.11.24Millosevichite
(Al,Fe)
 
2
(SO
 
4
)
 
3
25.11.25Aluminocopiapite
Al
 
2/3
Fe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
· 20H
 
2
O
25.11.26Halotrichite
FeAl
 
2
(SO
 
4
)
 
4
· 22H
 
2
O
25.11.27Idrizite
(Mg,Fe)(Al,Fe)
 
2
(SO
 
4
)
 
3
(OH)
 
2
· 15H
 
2
O or near
25.11.28Lishizhenite
ZnFe
 
2
(SO
 
4
)
 
4
· 14H
 
2
O
25.11.29Zincovoltaite
K
 
2
Zn
 
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O

Other Names for Mohrite

Synonyms:
IMA1964-023
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 Warning: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

Search Engines:
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  • External Links:
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  • Look for Mohrite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mohrite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Mohrite

    The 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. ? 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 Mtns
        • 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
     
    • 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)
    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).
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