Magnesioaubertite Mineral Data

Magnesioaubertite Mineral Data +

General Magnesioaubertite Information

Chemical Formula:

(Mg,Cu)Al(SO4)2Cl·14(H2O)

Composition:

Molecular Weight = 540.89 gm

Magnesium 3.37 % Mg 5.59 % MgO

Aluminum 4.99 % Al 9.43 % Al₂O₃

Copper 2.94 % Cu 3.68 % CuO

Hydrogen 5.22 % H 46.63 % H₂O

Sulfur 11.86 % S 29.60 % SO₃

Chlorine 6.55 % Cl 6.55 % Cl

- % Cl -1.48 % -O=Cl₂

Oxygen 65.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_0.75Cu_0.25Al(SO₄)₂Cl·14(H₂O)

IMA Status:

Approved IMA 1988

Locality:

Link to MinDat.org Location Data.

Magnesioaubertite Image

Images:

Click Here for Larger Magnesioaubertite Image

Magnesioaubertite Pickeringite

Comments: Aqua crystalline magnesioaubertite with white pickeringite.
Location: Grotto di Faraglione, Vulcano, Sicily, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnesioaubertite Crystallography

Axial Ratios:

a:b:c =0.478:1:0.4765

Cell Dimensions:

a = 6.31, b = 13.2, c = 6.29, Z = 1; alpha = 91.7°, beta = 94.5°, gamma = 82.6° V = 517.71 Den(Calc)= 1.73

Crystal System:

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

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

By Intensity(I/I_o): 4.5(1), 3.97(0.8), 5.61(0.7),

Physical Properties of Magnesioaubertite

Color:

Blue.

Density:

1.8

Diaphaniety:

Transparent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Optical Properties of Magnesioaubertite

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2764,KPDmeas= 0.2656,KC= 0.2686

Optical Data:

Biaxial (-), a=1.466, b=1.481, g=1.4875, bire=0.0215, 2V(Calc)=66, 2V(Meas)=112-114.

Calculated Properties of Magnesioaubertite

Electron Density:

r_electron=1.88 gm/cc
note: r_{Magnesioaubertite}=1.80 gm/cc.

Fermion Index

Fermion Index = 0.00457
Boson Index = 0.99543

Photoelectric:

PE_{Magnesioaubertite}= 2.66 barns/electron
U=PE_{Magnesioaubertite} x r_electron= 4.99 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesioaubertite is Not Radioactive

Magnesioaubertite Classification

Dana Class:

31.9.8.3 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.9)where (A+ B++) (XO4) Zq·x(H2O)

(31.9.8)Dana Group

31.9.8.1 Aubertite CuAl(SO4)2Cl·14(H2O) P1 1

31.9.8.2 Svyazhinite MgAl(SO4)2F·14(H2O) P1,P 1 Tri

31.9.8.3 Magnesioaubertite (Mg,Cu)Al(SO4)2Cl·14(H2O) P1 1

Strunz Class:

VI/D.07-30 VI - Sulfates,Chromates,Molybdates and Tungstates

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

VI/D.07 - Wilcoxite - Aubertite series

VI/D.07-10 Wilcoxite MgAl(SO4)2F·18(H2O) P 1,P1 Tri

VI/D.07-20 Svyazhinite MgAl(SO4)2F·14(H2O) P1,P 1 Tri

VI/D.07-30 Magnesioaubertite (Mg,Cu)Al(SO4)2Cl·14(H2O) P1 1

VI/D.07-40 Aubertite CuAl(SO4)2Cl·14(H2O) P1 1

Other Magnesioaubertite Information

References:

PHYS. PROP.(Am.Min.,Vol.75,p1433,1990) OPTIC PROP.(Am.Min.,Vol.75,p1433,1990)

See Also:

Links to other databases for Magnesioaubertite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Magnesioaubertite

(Mg,Cu)Al(SO4)2Cl·14(H2O)
Dana No: 31.9.8.3 Strunz No: VI/D.07-30
Locality:

Notes: