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Magnesiocarpholite Mineral Data
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General Magnesiocarpholite Information
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 Chemical Formula: |
MgAl2Si2O6(OH)4 |
| Composition: |
Molecular Weight = 298.46 gm |
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Magnesium 8.14 % Mg 13.50 % MgO |
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Aluminum 18.08 % Al 34.16 % Al2O3 |
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Silicon 18.82 % Si 40.26 % SiO2 |
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Hydrogen 1.35 % H 12.07 % H2O |
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Oxygen 53.61 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
MgAl2Si2O6(OH)4 |
| Environment: |
High-pressure/low-temperature mineral occurring in blueschist metamorphic rocks. |
| IMA Status: |
Approved IMA 1979 |
| Locality: |
Monticiano-Roccastrada Unit (Verrucano Formation, SouthernTuscany (Monte Leoni and Monte Argentario). Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named as the Mg-dominant member of the carpholite series. |
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Magnesiocarpholite Crystallography
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| Axial Ratios: |
a:b:c =0.6829:1:0.2543 |
| Cell Dimensions: |
a = 13.726, b = 20.099, c = 5.112, Z = 8; V = 1,410.29 Den(Calc)= 2.81 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C cca |
| X Ray Diffraction: |
By Intensity(I/Io): 5.66(1), 2.59(0.45), 5.02(0.45), |
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Physical Properties of Magnesiocarpholite
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| Cleavage: |
{???} Good |
| Color: |
Gray green, White. |
| Diaphaneity: |
Translucent |
| Habit: |
Columnar - Forms columns |
| Habit: |
Fibrous - Crystals made up of fibers. |
| Hardness: |
5-5.5 - Apatite-Knife Blade |
| Luster: |
Silky |
| Streak: |
white |
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Optical Properties of Magnesiocarpholite
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| Gladstone-Dale: |
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2135,KC= 0.2225
Ncalc = 1.63 |
| Optical Data: |
Biaxial (-), a=1.59, b=1.6, g=1.61, bire=0.0200, 2V(Calc)=88, 2V(Meas)=50-60. |
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Calculated Properties of Magnesiocarpholite
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| Electron Density: |
Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Magnesiocarpholite =2.81 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEMagnesiocarpholite = 1.46 barns/electron
U=PEMagnesiocarpholite x rElectron Density= 4.12 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Magnesiocarpholite is Not Radioactive |
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Magnesiocarpholite Classification
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| Dana Class: |
65.01.05.03 (65)Inosilicate Single-Width Unbranched Chains, W=1 |
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(65.01)with chains P=2 |
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(65.01.05)Carpholite group |
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65.01.05.01 Carpholite MnAl2Si2O6(OH)4 C cca 2/m 2/m 2/m |
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65.01.05.02 Ferrocarpholite (Fe,Mg)Al2Si2O6(OH)4 C cca 2/m 2/m 2/m |
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65.01.05.03 Magnesiocarpholite MgAl2Si2O6(OH)4 C cca 2/m 2/m 2/m |
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65.01.05.04 Balipholite BaMg2LiAl3Si4O12(OH,F)8 C cca 2/m 2/m 2/m |
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65.01.05.05 Potassiccarpholite! (K,Na,[])(Li,Mn)2Al)4Si4O12(OH)4(F,OH)4 C cca 2/m 2/m 2/m |
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65.01.05.06 Vanadiocarpholite! MnVAl(Si2O6)(OH)4 C cca 2/m 2/m 2/m |
| Strunz Class: |
09.DB.05 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DB -Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals |
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09.DB.05 Carpholite MnAl2Si2O6(OH)4 C cca 2/m 2/m 2/m |
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09.DB.05 Balipholite BaMg2LiAl3Si4O12(OH,F)8 C cca 2/m 2/m 2/m |
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09.DB.05 Ferrocarpholite (Fe,Mg)Al2Si2O6(OH)4 C cca 2/m 2/m 2/m |
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09.DB.05 Magnesiocarpholite MgAl2Si2O6(OH)4 C cca 2/m 2/m 2/m |
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09.DB.05 Potassiccarpholite! (K,Na,[])(Li,Mn)2Al)4Si4O12(OH)4(F,OH)4 C cca 2/m 2/m 2/m |
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09.DB.05 Vanadiocarpholite! MnVAl(Si2O6)(OH)4 C cca 2/m 2/m 2/m |
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Other Magnesiocarpholite Information
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| References: |
NAME( EurJMin, v 13, p 533) PHYS. PROP.(EurJMin, v 13, p 533) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Magnesiocarpholite :
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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Print or Cut-and-Paste your Magnesiocarpholite Specimen Label here :
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Magnesiocarpholite
MgAl2Si2O6(OH)4
Dana No: 65.01.05.03 Strunz No: 09.DB.05
Locality:
Notes:
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