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 % Al2 O3
Iron 15.30 % Fe 21.88 % Fe2 O3
Silicon 20.52 % Si 43.90 % SiO2
Oxygen 43.84 % O
______ ______
100.00 % 100.37 % = TOTAL OXIDE
Empirical Formula:
Mg3 Fe3+ 1.2 Al0.6 Si0.2 (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
X Ray Diffraction:
By Intensity(I/Io ): 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:
4
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:
PEMajorite = 5.79 barns/electronU=PEMajorite x r Electron 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 4 3d 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
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