Majorite Mineral Data

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

IMA Status:

Approved IMA 1970

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 27373

PDF 25-843

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Majorite Crystallography

Cell Dimensions:

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

Crystal System:

Isometric - HexoctahedralH-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),

Forms:

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Forms: [ 2 1 1]

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Crystal Structure:

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Hazen R M , Downs R T , Finger L W , Conrad P G , Gasparik T , American Mineralogist , 79 (1994) p.581-584, Crystal chemistry of Ca-bearing majorite

View Additional jPOWD Structure files for Majorite
[1] [10] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Majorite

Cleavage:

None

Color:

Yellow brown, Purple red.

Density:

Diaphaniety:

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

Optical Data:

Isotropic, n=1.8.

Calculated Properties of Majorite

Electron Density:

r_electron=3.74 gm/cc
note: r_Majorite=3.80 gm/cc.

Fermion Index

Fermion Index = 0.02968
Boson Index = 0.97032

Photoelectric:

PE_Majorite= 5.79 barns/electron
U=PE_Majorite x r_electron= 21.69 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Majorite is Not Radioactive

Majorite Classification

Dana Class:

51.4.3a.5 (51)Nesosilicate Insular SiO4 Groups Only

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

(51.4.3a)Garnet group (Pyralspite series)

51.4.3a.1 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

51.4.3a.2 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

51.4.3a.3 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

51.4.3a.4 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

51.4.3a.5 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

51.4.3a.6 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

Strunz Class:

VIII/A.08-60 VIII - Silicates

VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral and cubic orientation [8+6]

VIII/A.08 - Garnet group, Pyrope - Henritermierite

VIII/A.08-10 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-20 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-30 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-40 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-50 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-60 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-70 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-80 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

VIII/A.08-90 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

VIII/A.08-100 Hydrougrandite? (Ca,Mg,Fe)3(Fe,Al)2(SiO4)3-x(OH)4x I a3d 4/m 3 2/m

VIII/A.08-110 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-120 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

VIII/A.08-125 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

VIII/A.08-130 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-138 Yamatoite! (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-140 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-150 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

VIII/A.08-160 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Majorite Information

References:

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

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Majorite

Mg3(Fe,Al,Si)2(SiO4)3
Dana No: 51.4.3a.5 Strunz No: VIII/A.08-60
Locality:

Notes: