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Mohrite Mineral Data

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General Mohrite Information

Help on Chemical  Formula: Chemical Formula: (NH4)2Fe++(SO4)2•6(H2O)
Help on Composition: Composition: Molecular Weight = 392.14 gm
   Iron      14.24 %  Fe   18.32 % FeO
   Hydrogen   2.06 %  H      -   % Calc as (NH4)2O
   Hydrogen   3.08 %  H    27.56 % H2O
   Sulfur    16.35 %  S    40.83 % SO3
   Nitrogen   7.14 %  N    13.28 % (NH4)2O
   Oxygen    57.12 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)2Fe2+(SO4)2•6(H2O)
Help on Environment: Environment: Boriferous fumaroles and geysers.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: Travale, near Montieri, Val di Cecina, Tuscany, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Karl Friedrich Mohr (1806-1879), German analytical chemist, for whom the synthetic compound has long been named.
Help on Name Pronunciation: Name Pronunciation: Mohrite Say MOHRITE
Help on Synonym: Synonym: ICSD 65669
  Mohr's salt
  PDF 35-764

Mohrite Image

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Comments: Opaque botryoidal mohrite aggregate.
Location: Saint Etienne, Layonnais, Languedoc, Loire, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mohrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4944:1:0.7367
Help on Cell Dimensions: Cell Dimensions: a = 6.237, b = 12.613, c = 9.292, Z = 2; beta = 106.883° V = 699.47 Den(Calc)= 1.86
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.2(1), 3.79(0.55), 4.13(0.55),

Physical Properties of Mohrite

Help on Cleavage: Cleavage: {102} Perfect, {010} Distinct
Help on Color: Color: Light green.
Help on Density: Density: 1.8 - 1.862, Average = 1.83
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Mohrite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.328 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.307 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.262,KPDmeas= 0.2661,KC= 0.2004
Ncalc = 1.36 - 1.37
Help on Optical Data: Optical Data: Biaxial (+), a=1.48-1.486, g=1.486-1.497, bire=0.0060-0.0110, 2V(Meas)=75.

Calculated Properties of Mohrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.94 gm/cc
note: Specific Gravity of Mohrite =1.86 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEMohrite = 5.07 barns/electron
U=PEMohrite x rElectron Density= 9.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mohrite is Not Radioactive

Mohrite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.03)where (A+)2 B (XO4)2 � x(H2O)
  (29.03.07)Mohrite Group (Ammonia bearing) Mohrite (NH4)2Fe(SO4)2•6(H2O) P 21/c 2/m Boussingaultite (NH4)2Mg(SO4)2•6(H2O) P 21/a 2/m Nickelboussingaultite (NH4)2(Ni,Mg)(SO4)2•6(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 07.CC.60 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CC -With medium-sized and large cations
07.CC.60 Boussingaultite (NH4)2Mg(SO4)2•6(H2O) P 21/a 2/m
07.CC.60 Cyanochroite K2Cu(SO4)2•6(H2O) P 21/a 2/m
07.CC.60 Mohrite (NH4)2Fe(SO4)2•6(H2O) P 21/c 2/m
07.CC.60 Picromerite K2Mg(SO4)2•6(H2O) P 21/a 2/m
07.CC.60 Nickelboussingaultite (NH4)2(Ni,Mg)(SO4)2•6(H2O) P 21/a 2/m

Other Mohrite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Mohrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 07.CC.60





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