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Mohrite

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About MohriteHide

Karl Friedrich Mohr
Formula:
(NH4)2Fe(SO4)2 · 6H2O
Colour:
Pale green to colorless
Lustre:
Vitreous
Hardness:
2 - 2½
Specific Gravity:
1.800 - 1.862
Crystal System:
Monoclinic
Name:
Named in 1964 by Carlo Lorenzo Garavelli in honor of Karl Friedrich Mohr [November 4, 1806 Koblenz, Germany – September 28, 1879], after whom the synthetic compound was originally named. Mohr was initially a business chemist and he made many contributions to apparatus design, such as improved burets. His improvements to methods of volumetric analysis were important in quantitative chemical analysis. His theoretical contributions were very important including his 1837 promulgation of a succinct description of the Conservation of Energy. Mohr was the author of books on chemistry as well as geology. Late in life, he came out of early retiremnt and workd as professor of pharmacy at the University of Bonn.

Classification of MohriteHide

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

Physical Properties of MohriteHide

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

Optical Data of MohriteHide

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 MohriteHide

Formula:
(NH4)2Fe(SO4)2 · 6H2O
IMA Formula:
(NH4)2Fe2+(SO4)2 · 6H2O

Crystallography of MohriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
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 V:
704.32 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Subhedral crystals, irregular lamellae
Comment:
Synthetic

Type Occurrence of MohriteHide

Synonyms of MohriteHide

Other Language Names for MohriteHide

German:Mohrit
Simplified Chinese:六水铵铁矾
Spanish:Mohrita
Traditional Chinese:六水銨鐵礬

Relationship of Mohrite to other SpeciesHide

Other Members of this group:
Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m
Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
NickelpicromeriteK2Ni(SO4)2•6H2OMon. 2/m : P21/b
PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Tschermigite2 photos of Mohrite associated with Tschermigite on mindat.org.
Pyrite1 photo of Mohrite associated with Pyrite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.CC.CobaltoblöditeNa2Co(SO4)2•4H2OMon. 2/m : P21/b
7.CC.AndychristyitePbCu2+Te6+O5(H2O)Tric. 1 : P1
7.CC.05KrausiteKFe(SO4)2 · H2OMon. 2/m : P21/m
7.CC.10TamarugiteNaAl(SO4)2 · 6H2OMon. 2/m
7.CC.15KaliniteKAl(SO4)2 · 11H2OMon. 2/m : B2/b
7.CC.15MendoziteNaAl(SO4)2 · 11H2OMon. 2/m
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2OIso.
7.CC.20Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.25VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2OTet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2OTrig. 3 : P3
7.CC.40GoldichiteKFe(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2OTrig.
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.50ChangoiteNa2Zn(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.55LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2OMon.
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2OTric.
7.CC.75AmarilliteNaFe(SO4)2 · 6H2OMon. 2/m : B2/b
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

29.3.7.2Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
29.3.7.3Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

25.11.1NatrojarositeNaFe3(SO4)2(OH)6Trig. 3m : R3m
25.11.2SideronatriteNa2Fe(SO4)2(OH) · 3H2OOrth. 2 2 2 : P21 21 21
25.11.3MetasideronatriteNa2Fe(SO4)2(OH) · H2OOrth. mmm (2/m 2/m 2/m)
25.11.4FerrinatriteNa3Fe(SO4)3 · 3H2OTrig. 3 : P3
25.11.5AmarilliteNaFe(SO4)2 · 6H2OMon. 2/m : B2/b
25.11.6YavapaiiteKFe(SO4)2Mon. 2/m : B2/m
25.11.7KrausiteKFe(SO4)2 · H2OMon. 2/m : P21/m
25.11.8GoldichiteKFe(SO4)2 · 4H2OMon. 2/m : P21/b
25.11.9JarositeKFe3+ 3(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
25.11.10VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
25.11.11UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2OTrig. 3 : R3
25.11.12MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2OTrig.
25.11.13Sabieite(NH4)Fe3+(SO4)2Trig. 3 2 : P3 2 1
25.11.14Ammoniojarosite(NH4)Fe3+3(SO4)2(OH)6Trig. 3m : R3m
25.11.15Clairite(NH4)2Fe3(SO4)4(OH)3 · 3H2OTric.
25.11.17Lonecreekite(NH4)Fe3+(SO4)2 · 12H2OIso.
25.11.18Godovikovite(NH4)Al(SO4)2Trig. 3 2 : P3 2 1
25.11.19BotryogenMgFe3+(SO4)2(OH) · 7H2OMon. 2/m
25.11.21Slavíkite(H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2OTrig. 3 : R3
25.11.23SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2OTrig. 3m : P3 1c
25.11.24Millosevichite(Al,Fe)2(SO4)3Trig. 3 : R3
25.11.25AluminocopiapiteAl2/3Fe3+4(SO4)6(OH)2 · 20H2OTric. 1 : P1
25.11.26HalotrichiteFeAl2(SO4)4 · 22H2OMon. 2 : P2
25.11.27Idrizite(Mg,Fe)(Al,Fe)2(SO4)3(OH)2 · 15H2O or near
25.11.28LishizheniteZnFe2(SO4)4 · 14H2OTric. 1 : P1
25.11.29ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c

Other InformationHide

Notes:
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 MohriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 MohriteHide

Localities for MohriteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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.
  • Saskatchewan
Greengrass, K., Last, W. M., Deleqiat, J., & Suklmn, S. (1999). Waldsea lake Revisited: Another look at the Recent History of One of Western Canada's Best-studied Meromictic lakes.
Czech Republic
 
  • 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)
Kenya
 
  • Trans-Nzoia County
    • Mount Elgon
Bowell, R. J., Warren, A., & Redmond, I. (1996). Formation of cave salts and utilization by elephants in the Mount Elgon region, Kenya. Geological Society, London, Special Publications, 113(1), 63-79.
New Zealand
 
  • North Island
    • Manawatu-Wanganui Region
      • Ruapehu District
        • 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.
Peru
 
  • Arequipa Department
    • Caylloma Province
      • Chivay District
Ciesielczuk, J., Żaba, J., Bzowska, G., Gaidzik, K., & Głogowska, M. (2013). Sulphate efflorescences at the geyser near Pinchollo, southern Peru. Journal of South American Earth Sciences, 42, 186-193.
Poland
 
  • Upper Silesia (Śląskie)
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Radlin
Łukasz Kruszewski (2012) Unique chloride assemblage of exhalative origin from burning coal-mining dump in Radlin (Rybnik Coal Area, S Poland). Mineralogical Society of Poland Special Papers 40
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).
USA
 
  • Kentucky
    • Floyd Co.
Hower, J. C., O'Keefe, J. M., Henke, K. R., Wagner, N. J., Copley, G., Blake, D. R., ... & Silva, L. F. (2013). Gaseous emissions and sublimates from the Truman Shepherd coal fire, Floyd County, Kentucky: a re-investigation following attempted mitigation of the fire. International Journal of Coal Geology, 116, 63-74.
Mineral and/or Locality  
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