Chlormagaluminite Mineral Data

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

Diaphaneity:

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
Ncalc = 1.51 - 1.53

Optical Data:

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

Calculated Properties of Chlormagaluminite

Electron Density:

Bulk Density (Electron Density)=2.13 gm/cc
note: Specific Gravity of Chlormagaluminite =2.09 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

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

Chlormagaluminite Classification

Dana Class:

10.06.10.01 (10)Oxyhalides and Hydroxyhalides

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

(10.06.10)Dana Group

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

Strunz Class:

05.DA.45 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DA -With medium-sized cations

05.DA.45 Brugnatellite Mg6Fe(CO3)(OH)13•4(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Barbertonite Mg6Cr2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Chlormagaluminite (Mg,Fe)4Al2(OH)12(Cl2,CO3)•2(H2O) P 6/mcm, P 6cm, P 6c2 Hex

05.DA.45 Zaccagnaite! Zn4Al2(OH)12(CO3)•3(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Manasseite Mg6Al2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Sjogrenite Mg6Fe2(CO3)(OH)16•4(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 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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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: 10.06.10.01 Strunz No: 05.DA.45
Locality:

Notes: