Chlormagaluminite Mineral Data

Chlormagaluminite Mineral Data

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General Chlormagaluminite Information

Chemical Formula:

(Mg,Fe++)4Al2(OH)12(Cl2,CO3)·2(H2O)

Composition:

Molecular Weight = 472.53 gm

Magnesium 18.00 % Mg 29.85 % MgO

Aluminum 11.42 % Al 21.58 % Al₂O₃

Iron 5.91 % Fe 7.60 % FeO

Hydrogen 3.41 % H 30.50 % H₂O

Carbon 1.27 % C 4.66 % CO₂

Chlorine 7.50 % Cl 7.50 % Cl

- % Cl -1.69 % -O=Cl₂

Oxygen 52.48 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_3.5Fe²⁺_0.5Al₂(OH)₁₂Cl(CO₃)_0.5·2(H₂O)

Environment:

In skarns associated with magnetite and chlorite.

IMA Status:

Approved IMA 1982

Locality:

Kapaev explosion pipe, Angara River, southern Siberian Platform, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after its composition (Chloride, Magnesium, Aluminum).

Synonym:

Chlormanasseite

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Chlormagaluminite Crystallography

Axial Ratios:

a:c = 1:2.92249

Cell Dimensions:

a = 5.29, c = 15.46, Z = 1; V = 374.67 Den(Calc)= 2.09

Crystal System:

HexagonalSpace Group: P 6/mcm, P 6cm, P 6c2

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

By Intensity(I/I_o): 1.839(1), 7.67(1), 2.34(0.9),

Physical Properties of Chlormagaluminite

Cleavage:

[0001] Good

Color:

Colorless, Yellow brown.

Density:

1.98 - 2.09, Average = 2.03

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Pyramidal - Crystals are shaped like pyramids.

Hardness:

1.5-2.5 - Hardness very near Gypsum

Luster:

Pearly

Streak:

white

Optical Properties of Chlormagaluminite

Gladstone-Dale:

CI meas= -0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2632,KPDmeas= 0.2703,KC= 0.2559

Optical Data:

Uniaxial (+), w=1.54, e=1.56, bire=0.0200.

Calculated Properties of Chlormagaluminite

Electron Density:

r_electron=2.13 gm/cc
note: r_{Chlormagaluminite}=2.09 gm/cc.

Fermion Index

Fermion Index = 0.01965
Boson Index = 0.98035

Photoelectric:

PE_{Chlormagaluminite}= 2.99 barns/electron
U=PE_{Chlormagaluminite} x r_electron= 6.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chlormagaluminite is Not Radioactive

Chlormagaluminite Classification

Dana Class:

10.6.10.1 (10)Oxyhalides and Hydroxyhalides

(10.6)where Am Bn (O,OH)p Xq

(10.6.10)Dana Group

10.6.10.1 Chlormagaluminite (Mg,Fe)4Al2(OH)12(Cl2,CO3)·2(H2O) P 6/mcm, P 6cm, P 6c2 Hex

Strunz Class:

V/E.02-20 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.02 - Manasseite group

V/E.02-05 Quintinite-2H Mg4Al2(OH)12CO3·4(H2O) P 6₃22 6 2 2

V/E.02-05* Quintinite-3T Mg4Al2(OH)12CO3·4(H2O) P 3₁12,P 3₂12 3 2

V/E.02-07 Caresite Fe4Al2(OH)12CO3·3(H2O) P 3₁12 or P 3₂12 3 2

V/E.02-08 Charmarite-2H Mn4Al2(CO3)(OH)12·3(H2O) P 6₃22 6 2 2

V/E.02-08* Charmarite-3T Mn4Al2(CO3)(OH)12·3(H2O) P 3₁12 3 2

V/E.02-09 Zaccagnaite! Zn4Al2(OH)12(CO3)·3(H2O) P 6₃/mmc 6/m 2/m 2/m

V/E.02-10 Manasseite Mg6Al2(CO3)(OH)16·4(H2O) P 6₃/mmc 6/m 2/m 2/m

V/E.02-20 Chlormagaluminite (Mg,Fe)4Al2(OH)12(Cl2,CO3)·2(H2O) P 6/mcm, P 6cm, P 6c2 Hex

V/E.02-30 Barbertonite Mg6Cr2(CO3)(OH)16·4(H2O) P 6₃/mmc 6/m 2/m 2/m

V/E.02-40 Sjogrenite Mg6Fe2(CO3)(OH)14·5(H2O) P 6₃/mmc 6/m 2/m 2/m

Other Chlormagaluminite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Chlormagaluminite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 -École des Mines de Paris

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

Chlormagaluminite

(Mg,Fe++)4Al2(OH)12(Cl2,CO3)·2(H2O)
Dana No: 10.6.10.1 Strunz No: V/E.02-20
Locality:

Notes: