Majorite Mineral Data

General Majorite Information

Chemical Formula:

Mg3(Fe,Al,Si)2(SiO4)3

Composition:

Molecular Weight = 437.99 gm

Magnesium 16.65 % Mg 27.61 % MgO

Aluminum 3.70 % Al 6.98 % Al₂O₃

Iron 15.30 % Fe 21.88 % Fe₂O₃

Silicon 20.52 % Si 43.90 % SiO₂

Oxygen 43.84 % O

______ ______

100.00 % 100.37 % = TOTAL OXIDE

Empirical Formula:

Mg₃Fe³⁺_1.2Al_0.6Si_0.2(SiO₄)₃

Environment:

Formed from low-calcium, high-aluminum pyroxene, olivine, and shock-induced glass, by high-pressure impact metamorphism in bolides.

IMA Status:

Approved IMA 1970

Locality:

In the Coorara, Catherwood, Pampa del Infierno, Tenham, and Peace River chondritic meteorites. Link to MinDat.org Location Data.

Name Origin:

Named for Alan Major, who assisted A.E. Ringwood in the high-pressure synthesis of garnet from pyroxene.

Name Pronunciation:

Majorite

Synonym:

ICSD 27373

PDF 25-843

Majorite Image

Images:

Lingunite Ringwoodite Majorite

Comments: BSE image showing chondritic xenoliths and impact melt veins of lingunite (Lgt). Olivine (Olv), pyroxene (Pyx), maskelynite (Ms glass), ringwoodite (Rgt), and majorite (Mjt). Meteoritics & Planetary Science 43, No 5, 823-828 (2008).
Location: Polished thin section of the Sixiangkou meteorite. Scale: See Image.
© Meteoritics & Planetary Science

Majorite Crystallography

Cell Dimensions:

a = 11.524, Z = 8; V = 1,530.42 Den(Calc)= 3.80

Crystal System:

Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I a3d

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

By Intensity(I/I_o): 1.54(1), 2.58(1), 2.88(0.6),

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Physical Properties of Majorite

Cleavage:

None

Color:

Yellow brown, Purple red.

Density:

Diaphaneity:

Transparent to Translucent

Hardness:

7-7.5 - Quartz-Garnet

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Majorite

Gladstone-Dale:

CI meas= 0.13 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.084 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2105,KPDmeas= 0.2,KC= 0.2299
Ncalc = 1.87 - 1.92

Optical Data:

Isotropic, n=1.8.

Calculated Properties of Majorite

Electron Density:

Bulk Density (Electron Density)=3.74 gm/cc
note: Specific Gravity of Majorite =3.80 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Majorite= 5.79 barns/electron
U=PE_Majorite x rElectron Density= 21.69 barns/cc.

Radioactivity:

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

Majorite Classification

Dana Class:

51.04.03a.05 (51)Nesosilicate Insular SiO4 Groups Only

(51.04)with cations in [6] and >[6] coordination

(51.04.03a)Garnet group (Pyralspite series)

51.04.03a.01 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

51.04.03a.02 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

51.04.03a.03 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

51.04.03a.04 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

51.04.03a.05 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

51.04.03a.06 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

Strunz Class:

09.AD.25 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AD -Nesosilicates without additional anions;

09.AD.25 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

09.AD.25 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

09.AD.25 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

09.AD.25 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

09.AD.25 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

09.AD.25 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

09.AD.25 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m

09.AD.25 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Majorite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Majorite :
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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Majorite

Mg3(Fe,Al,Si)2(SiO4)3
Dana No: 51.04.03a.05 Strunz No: 09.AD.25
Locality:

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