Magnesiocopiapite Mineral Data

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)

Environment:

Secondary mineral, typically formed by oxidation of pyrite.

IMA Status:

Valid Species (Pre-IMA) 1938

Locality:

Blythe, Riverside Co., and at the Redington mercury mine, Knoxville, Napa Co., California, USA. Link to MinDat.org Location Data.

Name Origin:

Named for its magnesium content and relation to copiapite.

Name Pronunciation:

Magnesiocopiapite

Synonym:

ICSD 2917

PDF 42-599

Magnesiocopiapite Image

Images:

Guildite Magnesiocopiapite

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 - Pinacoidal H-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),

Physical Properties of Magnesiocopiapite

Cleavage:

{010} Perfect, {101} Indistinct

Color:

Green yellow, Yellow, Yellow green, Orange.

Density:

2.08 - 2.17, Average = 2.12

Diaphaneity:

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= 0.068 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2465,KPDmeas= 0.2529,KC= 0.2645
Ncalc = 1.55 - 1.58

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:

Bulk Density (Electron Density)=2.17 gm/cc
note: Specific Gravity of Magnesiocopiapite =2.13 gm/cc.

Fermion Index:

Fermion Index = 0.0073612525
Boson Index = 0.9926387475

Photoelectric:

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

Radioactivity:

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

Magnesiocopiapite Classification

Dana Class:

31.10.05.02 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.10)miscellaneous

(31.10.05)Copiapite Group

31.10.05.01 Copiapite FeFe4(SO4)6(OH)2•20(H2O) P1 1

31.10.05.02 Magnesiocopiapite MgFe4(SO4)6(OH)2•20(H2O) P1 1

31.10.05.03 Cuprocopiapite CuFe4(SO4)6(OH)2•20(H2O) P1 1

31.10.05.04 Ferricopiapite Fe2/3Fe4(SO4)6(OH)2•20(H2O) P1 1

31.10.05.05 Calciocopiapite CaFe4(SO4)6(OH)2•19(H2O) P1 1

31.10.05.06 Zincocopiapite ZnFe4(SO4)6(OH)2•18(H2O) P1 1

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

Strunz Class:

07.DB.35 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DB -With only medium-sized cations; insular octahedra and finite groups

07.DB.35 Aluminocopiapite Al2/3Fe4(SO4)6O(OH)2•20(H2O) P1 1

07.DB.35 Copiapite FeFe4(SO4)6(OH)2•20(H2O) P1 1

07.DB.35 Calciocopiapite CaFe4(SO4)6(OH)2•19(H2O) P1 1

07.DB.35 Cuprocopiapite CuFe4(SO4)6(OH)2•20(H2O) P1 1

07.DB.35 Ferricopiapite Fe2/3Fe4(SO4)6(OH)2•20(H2O) P1 1

07.DB.35 Magnesiocopiapite MgFe4(SO4)6(OH)2•20(H2O) P1 1

07.DB.35 Zincocopiapite ZnFe4(SO4)6(OH)2•18(H2O) P1 1

Other Magnesiocopiapite Information

References:

NAME( AntBidBlaNic5) 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 - 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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Magnesiocopiapite

MgFe+++4(SO4)6(OH)2•20(H2O)
Dana No: 31.10.05.02 Strunz No: 07.DB.35
Locality:

Notes:

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