Mapimite Mineral Data

General Mapimite Information

Chemical Formula:

Zn2Fe+++3(AsO4)3(OH)4•10(H2O)

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

Empirical Formula:

Zn₂Fe³⁺₃(AsO₄)₃(OH)₄•10(H₂O)

Environment:

Rare secondary mineral in the oxidized zone of an arsenic-rich hydrothermal polymetallic ore deposit.

IMA Status:

Approved IMA 1981

Locality:

Ojuela mine, Mapimi, Durango, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Mapimite

Synonym:

ICSD 26554

PDF 35-515

Mapimite Crystallography

Axial Ratios:

a:b:c =1.0114:1:0.7672

Cell Dimensions:

a = 11.425, b = 11.296, c = 8.667, Z = 2; beta = 107.733° V = 1,065.39 Den(Calc)= 3.00

Crystal System:

Monoclinic - Domatic H-M Symbol (m) Space Group: Cm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.24(1), 7.83(0.94), 4.662(0.61),

Physical Properties of Mapimite

Cleavage:

{???} Good

Color:

Blue, Green.

Density:

2.95

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Mapimite

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

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

Electron Density:

Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Mapimite =2.95 gm/cc.

Fermion Index:

Fermion Index = 0.0094648829
Boson Index = 0.9905351171

Photoelectric:

PE_Mapimite= 27.46 barns/electron
U=PE_Mapimite x rElectron Density= 78.88 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mapimite is Not Radioactive

Mapimite Classification

Dana Class:

42.08.07.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.08)where (AB)7 (XO4)4 Zq ï¿½ x(H2O)

(42.08.07)Dana Group

42.08.07.01 Mapimite Zn2Fe3(AsO4)3(OH)4•10(H2O) Cm m

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

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

Mapimite

Zn2Fe+++3(AsO4)3(OH)4•10(H2O)
Dana No: 42.08.07.01 Strunz No: 08.DC.55
Locality:

Notes:

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