Magnesiocarpholite Mineral Data

Magnesiocarpholite Mineral Data

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General Magnesiocarpholite Information

Chemical Formula:

MgAl2Si2O6(OH)4

Composition:

Molecular Weight = 298.46 gm

Magnesium 8.14 % Mg 13.50 % MgO

Aluminum 18.08 % Al 34.16 % Al₂O₃

Silicon 18.82 % Si 40.26 % SiO₂

Hydrogen 1.35 % H 12.07 % H₂O

Oxygen 53.61 % O

______ ______

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

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C cca

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

By Intensity(I/I_o): 5.66(1), 2.59(0.45), 5.02(0.45),

Crystal Structure:

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Viswanathan K , American Mineralogist , 66 (1981) p.1080-1085, The crystal structure of a Mg-rich carpholite, Locality: southeast Sfinari, West Crete

View Additional jPOWD Structure files for Magnesiocarpholite
[1] [2]

Physical Properties of Magnesiocarpholite

Cleavage:

[???] Good

Color:

Gray green, White.

Diaphaniety:

Translucent

Habit:

Columnar - Forms columns

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Silky

Streak:

white

Optical Properties of Magnesiocarpholite

Gladstone-Dale:

CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2135,KC= 0.2225

Optical Data:

Biaxial (-), a=1.59, b=1.6, g=1.61, bire=0.0200, 2V(Calc)=88, 2V(Meas)=50-60.

Calculated Properties of Magnesiocarpholite

Electron Density:

r_electron=2.82 gm/cc
note: r_{Magnesiocarpholite}=2.81 gm/cc.

Fermion Index

Fermion Index = 0.01719
Boson Index = 0.98281

Photoelectric:

PE_{Magnesiocarpholite}= 1.46 barns/electron
U=PE_{Magnesiocarpholite} x r_electron= 4.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesiocarpholite is Not Radioactive

Magnesiocarpholite Classification

Dana Class:

65.1.5.3 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.1)with chains P=2

(65.1.5)Carpholite group

65.1.5.1 Carpholite MnAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

65.1.5.2 Ferrocarpholite (Fe,Mg)Al2Si2O6(OH)4 C cca 2/m 2/m 2/m

65.1.5.3 Magnesiocarpholite MgAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

65.1.5.4 Balipholite BaMg2LiAl3Si4O12(OH,F)8 C cca 2/m 2/m 2/m

65.1.5.5 Potassic-carpholite! (K,Na,[])(Li,Mn)2Al)4Si4O12(OH)4(F,OH)4 C cca 2/m 2/m 2/m

65.1.5.6 Vanadiocarpholite! MnVAl(Si2O6)(OH)4 C cca 2/m 2/m 2/m

Strunz Class:

VIII/F.03-10 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si2O6]4-

VIII/F.03 - Magnesiocarpholite - Vinogradovite series

VIII/F.03-10 Magnesiocarpholite MgAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

VIII/F.03-20 Ferrocarpholite (Fe,Mg)Al2Si2O6(OH)4 C cca 2/m 2/m 2/m

VIII/F.03-30 Carpholite MnAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

VIII/F.03-40 Balipholite BaMg2LiAl3Si4O12(OH,F)8 C cca 2/m 2/m 2/m

VIII/F.03-50 Lorenzenite Na2Ti2Si2O9 P bcn 2/m 2/m 2/m

VIII/F.03-60 Lintisite Na3LiTi2Si4O14·2(H2O) C 2/c 2/m

VIII/F.03-70 Vinogradovite (Na,K)4Ti4(Si,Al)8O26·3(H2O,Na) A2/a 2/m

VIII/F.03-80 Paravinogradovite! (Na,[])2(Ti,Fe)4(Si2O6)2(Si3AlO10)(OH)4·H2O P1 1

Other Magnesiocarpholite Information

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Magnesiocarpholite

MgAl2Si2O6(OH)4
Dana No: 65.1.5.3 Strunz No: VIII/F.03-10
Locality:

Notes: