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Akrochordite Mineral Data

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General Akrochordite Information

Help on Chemical  Formula: Chemical Formula: Mn4Mg(AsO4)2(OH)4•4(H2O)
Help on Composition: Composition: Molecular Weight = 661.99 gm
   Magnesium   3.67 %  Mg    6.09 % MgO
   Manganese  33.20 %  Mn   42.86 % MnO
   Arsenic    22.64 %  As   34.72 % As2O5
   Hydrogen    1.83 %  H    16.33 % H2O
   Oxygen     38.67 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+4Mg(AsO4)2(OH)4•4(H2O)
Help on Environment: Environment: A rare mineral in hausmannite ore from a metamorphosed Fe-Mn orebody (L�ngban, Sweden); in a metamorphosed stratiform zinc orebody (Sterling Hill, New Jersey, USA).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1922
Help on Locality: Locality: From L�ngban, Varmland, Sweden. At Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for wart, for its typical habit.
Help on Name Pronunciation: Name Pronunciation: Akrochordite + Pronunciation Say AKROCHORDITE
Help on Synonym: Synonym: ICSD 202938
  PDF 20-715

Akrochordite Image

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  Eveite   Akrochordite

Comments: Micro crystals (to about 0.75mm) of very pale grayish green eveite in tiny vug with light pink akrochordite. Co-Type specimen & type locality.
Location: Langban, Varmland, Sweden. Scale: 13x10x4 mm.
© Tom Loomis / Dakota Matrix

Akrochordite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3223:1:0.3875
Help on Cell Dimensions: Cell Dimensions: a = 5.682, b = 17.627, c = 6.832, Z = 2; beta = 99.49° V = 674.91 Den(Calc)= 3.26
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): 4.4(1), 8.79(0.8), 2.75(0.5),

Physical Properties of Akrochordite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Reddish brown.
Help on Density: Density: 3.19 - 3.26, Average = 3.22
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 3.5 - Copper Penny

Optical Properties of Akrochordite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2077,KPDmeas= 0.2099,KC= 0.2084
Ncalc = 1.66 - 1.68
Help on Optical Data: Optical Data: Biaxial (?), a=1.672, b=1.676, g=1.683, bire=0.0110

Calculated Properties of Akrochordite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.13 gm/cc
note: Specific Gravity of Akrochordite =3.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0038598843
Boson Index = 0.9961401157
Help on Photoelectric: Photoelectric: PEAkrochordite = 23.92 barns/electron
U=PEAkrochordite x rElectron Density= 74.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Akrochordite is Not Radioactive

Akrochordite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.04)where (AB)5 (XO4)2 Zq � x(H2O)
  (42.04.01)Akrochordite Group Akrochordite Mn4Mg(AsO4)2(OH)4•4(H2O) P 21/c 2/m Guanacoite! (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.DD.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DD -With only medium-sized cations, (OH, etc.):RO4 = 2:1
08.DD.10 Akrochordite Mn4Mg(AsO4)2(OH)4•4(H2O) P 21/c 2/m
08.DD.10 Guanacoite! (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 P 21/c 2/m

Other Akrochordite Information

Help on References: References: NAME( AntBidBlaNic4) 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 Akrochordite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 08.DD.10





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