Mallardite Mineral Data

Mallardite Mineral Data +

General Mallardite Information

Chemical Formula:

Mn++SO4·7(H2O)

Composition:

Molecular Weight = 277.11 gm

Manganese 19.83 % Mn 25.60 % MnO

Hydrogen 5.09 % H 45.51 % H₂O

Sulfur 11.57 % S 28.89 % SO₃

Oxygen 63.51 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺(SO₄)·7(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1879

Locality:

Link to MinDat.org Location Data.

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Mallardite Crystallography

Axial Ratios:

a:b:c =2.1769:1:1.7015

Cell Dimensions:

a = 14.15, b = 6.5, c = 11.06, Z = 4; beta = 105.6° V = 979.77 Den(Calc)= 1.88

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 4.92(1), 5.49(0.7), 4.88(0.55),

Physical Properties of Mallardite

Cleavage:

[001] Good

Color:

Colorless, White, Light pink.

Density:

1.846

Diaphaniety:

Transparent

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Mallardite

Gladstone-Dale:

CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2484,KPDmeas= 0.253,KC= 0.2563

Optical Data:

Biaxial (+), a=1.462, b=1.465, g=1.474, bire=0.0120

Calculated Properties of Mallardite

Electron Density:

r_electron=1.91 gm/cc
note: r_Mallardite=1.85 gm/cc.

Fermion Index

Fermion Index = 0.00118
Boson Index = 0.99882

Photoelectric:

PE_Mallardite= 5.59 barns/electron
U=PE_Mallardite x r_electron= 10.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mallardite is Not Radioactive

Mallardite Classification

Dana Class:

29.6.10.5 (29)Hydrated Acid and Sulfates

(29.6)where A XO4 · x(H2O)

(29.6.10)Melanterite Group (Heptahydrates, Monoclinic: P21/c)

29.6.10.1 Melanterite FeSO4·7(H2O) P 2₁/c 2/m

29.6.10.2 Boothite CuSO4·7(H2O) P 2₁/c 2/m

29.6.10.3 Zinc-melanterite (Zn,Cu,Fe)SO4·7(H2O) P 2₁/c 2/m

29.6.10.4 Bieberite CoSO4·7(H2O) P 2₁/c 2/m

29.6.10.5 Mallardite MnSO4·7(H2O) P 2₁/c 2/m

29.6.10.6 IMA2003-040! (Mg,Cu)SO4·7H2O P 2₁/c 2/m

Strunz Class:

VI/C.06-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size

VI/C.06 - Melanterite group

VI/C.06-10 Melanterite FeSO4·7(H2O) P 2₁/c 2/m

VI/C.06-20 Mallardite MnSO4·7(H2O) P 2₁/c 2/m

VI/C.06-30 Bieberite CoSO4·7(H2O) P 2₁/c 2/m

VI/C.06-40 Boothite CuSO4·7(H2O) P 2₁/c 2/m

VI/C.06-50 Zinc-melanterite (Zn,Cu,Fe)SO4·7(H2O) P 2₁/c 2/m

Other Mallardite Information

References:

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

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

Mallardite

Mn++SO4·7(H2O)
Dana No: 29.6.10.5 Strunz No: VI/C.06-20
Locality:

Notes: