Mineralogy Database

Mapimite Mineral Data

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General Mapimite Information

Help on Chemical  Formula: Chemical Formula: Zn2Fe+++3(AsO4)3(OH)4•10(H2O)
Help on Composition: Composition: Molecular Weight = 963.26 gm
   Zinc      13.58 %  Zn   16.90 % ZnO
   Iron      17.39 %  Fe   24.87 % Fe2O3
   Arsenic   23.33 %  As   35.79 % As2O5
   Hydrogen   2.51 %  H    22.44 % H2O
   Oxygen    43.19 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Zn2Fe3+3(AsO4)3(OH)4•10(H2O)
Help on Environment: Environment: Rare secondary mineral in the oxidized zone of an arsenic-rich hydrothermal polymetallic ore deposit.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Ojuela mine, Mapimi, Durango, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Mapimite Say MAPIMITE
Help on Synonym: Synonym: ICSD 26554
  PDF 35-515

Mapimite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0114:1:0.7672
Help on Cell Dimensions: Cell Dimensions: a = 11.425, b = 11.296, c = 8.667, Z = 2; beta = 107.733° V = 1,065.39 Den(Calc)= 3.00
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.24(1), 7.83(0.94), 4.662(0.61),

Physical Properties of Mapimite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Blue, Green.
Help on Density: Density: 2.95
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Mapimite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2291,KPDmeas= 0.233,KC= 0.2393
Ncalc = 1.71 - 1.72
Help on Optical Data: Optical Data: Biaxial (+), a=1.672, b=1.678, g=1.712, bire=0.0400, 2V(Calc)=48, 2V(Meas)=50.

Calculated Properties of Mapimite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Mapimite =2.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0094648829
Boson Index = 0.9905351171
Help on Photoelectric: Photoelectric: PEMapimite = 27.46 barns/electron
U=PEMapimite x rElectron Density= 78.88 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mapimite is Not Radioactive

Mapimite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.08)where (AB)7 (XO4)4 Zq � x(H2O)
  (42.08.07)Dana Group Mapimite Zn2Fe3(AsO4)3(OH)4•10(H2O) Cm m
Help on  Strunz Class: Strunz Class: 08.DC.55 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
08.DC.55 Mapimite Zn2Fe3(AsO4)3(OH)4•10(H2O) Cm m

Other Mapimite 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 Mapimite :
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: 08.DC.55





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