Magnesiocopiapite Mineral Data

Magnesiocopiapite Mineral Data +

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General Magnesiocopiapite Information

Chemical Formula:

MgFe+++4(SO4)6(OH)2·20(H2O)

Composition:

Molecular Weight = 1,218.39 gm

Magnesium 1.99 % Mg 3.31 % MgO

Iron 18.33 % Fe 26.21 % Fe₂O₃

Hydrogen 3.47 % H 31.05 % H₂O

Sulfur 15.79 % S 39.43 % SO₃

Oxygen 60.41 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgFe³⁺₄(SO₄)₆(OH)₂·20(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1938

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 2917

PDF 42-599

Magnesiocopiapite Image

Images:

Click Here for Larger Magnesiocopiapite Image

Magnesiocopiapite Guildite

Comments: Brown granular guildite with greenish yellow magnesiocopiapite.
Location: United Verde Mine, Jerome, Yavapai County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Magnesiocopiapite

Comments: Pale yellow opaque aggregate of magnesiocopiapite.
Location: Denver Mine, Santa Cruz County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnesiocopiapite Crystallography

Axial Ratios:

a:b:c =0.4038:1:0.4005

Cell Dimensions:

a = 7.33, b = 18.15, c = 7.27, Z = 1; alpha = 93.85°, beta = 101.5°, gamma = 99.383° V = 932.99 Den(Calc)= 2.17

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 9.29(1), 18.57(0.9), 5.6(0.8),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Susse P , Zeitschrift fur Kristallographie , 135 (1972) p.34-55, Crystal structure and hydrogen bonding of copiapite, Locality: Alcaparrosa, Chile

Physical Properties of Magnesiocopiapite

Cleavage:

[010] Perfect, [101] Indistinct

Color:

Green yellow, Yellow, Yellow green, Orange.

Density:

2.08 - 2.17, Average = 2.12

Diaphaniety:

Transparent to Translucent

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Pearly

Streak:

light yellow

Optical Properties of Magnesiocopiapite

Gladstone-Dale:

CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2476,KPDmeas= 0.2529,KC= 0.2645

Optical Data:

Biaxial (+), a=1.507, b=1.529, g=1.576, bire=0.0690, 2V(Calc)=72, 2V(Meas)=67.

Calculated Properties of Magnesiocopiapite

Electron Density:

r_electron=2.17 gm/cc
note: r_{Magnesiocopiapite}=2.13 gm/cc.

Fermion Index

Fermion Index = 0.00736
Boson Index = 0.99264

Photoelectric:

PE_{Magnesiocopiapite}= 6.32 barns/electron
U=PE_{Magnesiocopiapite} x r_electron= 13.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesiocopiapite is Not Radioactive

Magnesiocopiapite Classification

Dana Class:

31.10.5.2 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.10)miscellaneous

(31.10.5)Copiapite Group

31.10.5.1 Copiapite FeFe4(SO4)6(OH)2·20(H2O) P1 1

31.10.5.2 Magnesiocopiapite MgFe4(SO4)6(OH)2·20(H2O) P1 1

31.10.5.3 Cuprocopiapite CuFe4(SO4)6(OH)2·20(H2O) P1 1

31.10.5.4 Ferricopiapite Fe2/3Fe4(SO4)6(OH)2·20(H2O) P1 1

31.10.5.5 Calciocopiapite CaFe4(SO4)6(OH)2·19(H2O) P1 1

31.10.5.6 Zincocopiapite ZnFe4(SO4)6(OH)2·18(H2O) P1 1

31.10.5.7 Aluminocopiapite Al2/3Fe4(SO4)6O(OH)2·20(H2O) P1 1

Strunz Class:

VI/D.10-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.10 - Copiapite group, Botryogen - Chaidamuite

VI/D.10-10 Botryogen MgFe(SO4)2(OH)·7(H2O) P 2₁/n 2/m

VI/D.10-20 Zincobotryogen (Zn,Mg,Mn)Fe(SO4)2(OH)·7(H2O) P 2₁/n 2/m

VI/D.10-30 Calciocopiapite CaFe4(SO4)6(OH)2·19(H2O) P1 1

VI/D.10-40 Magnesiocopiapite MgFe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-50 Copiapite FeFe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-60 Cuprocopiapite CuFe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-70 Zincocopiapite ZnFe4(SO4)6(OH)2·18(H2O) P1 1

VI/D.10-80 Aluminocopiapite Al2/3Fe4(SO4)6O(OH)2·20(H2O) P1 1

VI/D.10-90 Ferricopiapite Fe2/3Fe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-100 Guildite CuFe(SO4)2(OH)·4(H2O) P 2₁/m 2/m

VI/D.10-110 Chaidamuite (Zn,Fe)Fe(SO4)2(OH)·4(H2O) P1 1

Other Magnesiocopiapite 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 Magnesiocopiapite :
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 -École des Mines de Paris

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Magnesiocopiapite

MgFe+++4(SO4)6(OH)2·20(H2O)
Dana No: 31.10.5.2 Strunz No: VI/D.10-40
Locality:

Notes: