Grischunite Mineral Data

Grischunite Mineral Data +

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General Grischunite Information

Chemical Formula:

NaCa2Mn++5Fe+++(AsO4)6·2(H2O)

Composition:

Molecular Weight = 1,303.23 gm

Sodium 1.76 % Na 2.38 % Na₂O

Calcium 6.15 % Ca 8.61 % CaO

Manganese 21.08 % Mn 27.22 % MnO

Iron 4.29 % Fe 6.13 % Fe₂O₃

Arsenic 34.49 % As 52.91 % As₂O₅

Hydrogen 0.31 % H 2.76 % H₂O

Oxygen 31.92 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCa₂Mn²⁺₅Fe³⁺(AsO₄)₆·2(H₂O)

IMA Status:

Approved IMA 1984

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 63431

PDF 38-387

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Grischunite Crystallography

Axial Ratios:

a:b:c =0.9531:1:0.8932

Cell Dimensions:

a = 12.855, b = 13.487, c = 12.047, Z = 4; V = 2,088.65 Den(Calc)= 4.14

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcab

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

By Intensity(I/I_o): 2.839(1), 3.15(0.9), 3.015(0.8),

Crystal Structure:

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Bianchi R , Pilati T , Mannucci G , American Mineralogist , 72 (1987) p.1225-1229, Crystal structure of grischunite

Physical Properties of Grischunite

Cleavage:

[???] Perfect

Color:

Dark reddish brown.

Density:

3.8

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

brown

Optical Properties of Grischunite

Gladstone-Dale:

CI meas= -0.086 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1899,KPDmeas= 0.2069,KC= 0.1906

Optical Data:

Biaxial (+), a=1.784, b=1.785, g=1.79, bire=0.0060, 2V(Calc)=50, 2V(Meas)=40-50.

Calculated Properties of Grischunite

Electron Density:

r_electron=3.89 gm/cc
note: r_Grischunite=4.14 gm/cc.

Fermion Index

Fermion Index = 0.00114
Boson Index = 0.99886

Photoelectric:

PE_Grischunite= 31.47 barns/electron
U=PE_Grischunite x r_electron= 122.38 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Grischunite is Not Radioactive

Grischunite Classification

Dana Class:

40.2.11.1 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.11)Dana Group

40.2.11.1 Grischunite NaCa2Mn5Fe(AsO4)6·2(H2O) Pcab 2/m 2/m 2/m

Strunz Class:

VII/C.18-20 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.18 - Wicksite - Alentaite series

VII/C.18-10 Wicksite NaCa2(Fe,Mn)4MgFe(PO4)6·2(H2O) P bca 2/m 2/m 2/m

VII/C.18-15 Bederite! ([],Na)Ca2(Mn,Mg,Fe)2(Fe,Mg,Al)2Mn2(PO4)6·2(H2O) Pcab 2/m 2/m 2/m

VII/C.18-20 Grischunite NaCa2Mn5Fe(AsO4)6·2(H2O) Pcab 2/m 2/m 2/m

VII/C.18-30 Walentaite (Ca,Mn,Fe)Fe3(AsO4)(PO4)3(PO3OH) I mmm, I bam, I bca, I mma Ortho

VII/C.18-35 Mereiterite! K2Fe(SO4)2·4(H2O) C 2/m 2/m

Other Grischunite Information

References:

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

See Also:

Links to other databases for Grischunite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Grischunite

NaCa2Mn++5Fe+++(AsO4)6·2(H2O)
Dana No: 40.2.11.1 Strunz No: VII/C.18-20
Locality:

Notes: