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Manganohornesite Mineral Data

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General Manganohornesite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Mg)3(AsO4)2•8(H2O)
Help on Composition: Composition: Molecular Weight = 563.80 gm
   Magnesium   3.23 %  Mg    5.36 % MgO
   Manganese  21.92 %  Mn   28.31 % MnO
   Arsenic    26.58 %  As   40.77 % As2O5
   Hydrogen    2.86 %  H    25.56 % H2O
   Oxygen     45.40 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+2.25Mg0.75(AsO4)2•8(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1951
Help on Locality: Locality: Langban, varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition and relationship to hornesite.
Help on Synonym: Synonym: Manganese-hornesite - Renamed as Manganohornesite by Mineralogical Record, v330 (2008), p131
 

Manganohornesite Image

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  Manganohornesite

Comments: Micro, white, needles of manganese-hornesite to about 0.75mm on hausmannite-rich matrix.
Location: Langban, Varmland, Sweden. Scale: 5.5 x 4 x 2.5cm.
© Tom Loomis / Dakota Matrix

Manganohornesite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3695:1:0.1699
Help on Cell Dimensions: Cell Dimensions: a = 10.38, b = 28.09, c = 4.774, Z = 4; beta = 105.7° V = 1,340.04 Den(Calc)= 2.79
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): 7.01(1), 8.19(0.8), 3.02(0.7),
 

Physical Properties of Manganohornesite

Help on Color: Color: White.
Help on Density: Density: 2.64
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.
Help on Hardness: Hardness: 1 - Talc
 

Optical Properties of Manganohornesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2123,KPDmeas= 0.2244,KC= 0.2194
Ncalc = 1.58 - 1.61
Help on Optical Data: Optical Data: Biaxial (+), a=1.579, b=1.589, g=1.609, bire=0.0300, 2V(Calc)=72, 2V(Meas)=65-70.
 

Calculated Properties of Manganohornesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Manganohornesite =2.64 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0034554265
Boson Index = 0.9965445735
Help on Photoelectric: Photoelectric: PEManganohornesite = 23.33 barns/electron
U=PEManganohornesite x rElectron Density= 60.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Manganohornesite is Not Radioactive
 

Manganohornesite Classification

Help on  Dana Class: Dana Class: 40.03.07.02 (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 � x(H2O)
  (40.03.07)Dana Group
 
40.03.07.01 Bobierrite Mg3(PO4)2•8(H2O) C 2/c 2/m
 
40.03.07.02 Manganohornesite (Mn,Mg)3(AsO4)2•8(H2O) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.CE.40 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CE -With only medium-sized cations, RO4:H2O � 1:2.5
 
08.CE.40 Arupite (Ni,Fe)3(PO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Annabergite Ni3(AsO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Baricite (Mg,Fe)3(PO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Erythrite Co3(AsO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Ferrisymplesite Fe3(AsO4)2(OH)3•5(H2O) None
 
08.CE.40 Hornesite Mg3(AsO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Kottigite Zn3(AsO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Manganohornesite (Mn,Mg)3(AsO4)2•8(H2O) P 21/c 2/m
 
08.CE.40 Parasymplesite Fe3(AsO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Vivianite Fe3(PO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Pakhomovskyite! Co3(PO4)2•8(H2O) C 2/m 2/m
 

Other Manganohornesite Information

Help on References: References: NAME( Dana8) 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 Manganohornesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Manganohornesite Specimen Label here :

Manganohornesite

(Mn,Mg)3(AsO4)2•8(H2O)
Dana No: 40.03.07.02 Strunz No: 08.CE.40
Locality:

 

Notes:

 

 
   
 


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