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 % Al2 O3
Iron 5.91 % Fe 7.60 % FeO
Hydrogen 3.41 % H 30.50 % H2 O
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:
Mg3.5 Fe2+ 0.5 Al2 (OH)12 Cl(CO3 )0.5 •2(H2 O)
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
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:
Hexagonal Space Group: P 6/mcm, P 6cm, P 6 c2
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEChlormagaluminite = 2.99 barns/electronU=PEChlormagaluminite x r Electron 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 6 c2 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 6 c2 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:
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