Almandine Mineral Data + Say ALMANDINE

General Almandine Information
Help on Chemical Formula: Chemical Formula: Fe++3Al2(SiO4)3
Help on Composition: Composition: Molecular Weight = 497.75 gm
   Aluminum  10.84 %  Al   20.48 % Al2O3
   Iron      33.66 %  Fe   43.30 % FeO
   Silicon   16.93 %  Si   36.21 % SiO2
   Oxygen    38.57 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+3Al2(SiO4)3
Help on Environment: Environment: Metamorphic and pegmatitic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) Prehistoric
Help on Locality: Locality: Alabanda in Asia Minor. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Synonym: Synonym: Almandite
  ICSD 28030
  PDF 41-1423
 

Almandine Image

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Almandine

Comments: Two reddish brown crystals of almandine on matrix.
Location: Fanny Gorge mine, Spruce Pine, Mitchell County, North Carolina, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals
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Almandine   Hypersthene

Comments: Dark green blocky crystals hypersthene with reddish almandine.
Location: Barton Garnet Mine, North Creek, Warren County, Adirondacks, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Almandine Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 11.526, Z = 8; V = 1,531.21 Den(Calc)= 4.32
Help on Crystal System: 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/Io): 2.569(1), 1.54(0.5), 2.873(0.4),
Help on Forms: Forms:

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Forms: [ 1 1 2]

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Novak G A , Gibbs G V , American Mineralogist , 56 (1971) p.791-825, The crystal chemistry of the silicate garnets, sample Al

View Additional jPOWD Structure files for Almandine
[1] [10] [11] [12] [2] [3] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Almandine

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Brownish red, Red, Black, Black red.
Help on Density: Density: 4.09 - 4.31, Average = 4.19
Help on Diaphaniety: Diaphaniety: Transparent to Subtransparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Massive - Lamellar - Distinctly foliated fine-grained forms.
Help on Hardness: Hardness: 7-8
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white
 

Optical Properties of Almandine

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1921,KPDmeas= 0.1976,KC= 0.1991
Help on Optical Data: Optical Data: Isotropic, n=1.83.
 

Calculated Properties of Almandine

Help on Electron Density: Electron Density:

relectron=4.08 gm/cc
note: rAlmandine =4.20 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01522
Boson Index = 0.98478
Help on Photoelectric: Photoelectric:

PEAlmandine = 11.03 barns/electron
U=PEAlmandine x relectron= 45.06 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Almandine is Not Radioactive
 

Almandine Classification
Help on Dana Class: Dana Class: 51.4.3a.2 (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
Help on Strunz Class: Strunz Class: VIII/A.08-20 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 Almandine Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Almandine :
1 - Alkali-Nuts(English) 2 -Am. Min. Crystal Structure Database 3 - Amethyst Galleries' Mineral Gallery 4 - Applied Mineralogy 5 -Athena 6 - CalTech Mineral Spectroscopy 7 - Crocoite.com Mineral Locations 8 - Franklin Minerals(Dunn) 9 -Google Images 10 -Google Scholar 11 -Handbook of Mineralogy (MinSocAm) 12 -Handbook of Mineralogy (UofA) 13 - HyperPhysics 14 -MinDAT 15 -MinMax(Deutsch) 16 -MinMax(English) 17 - Mineral and Gemstone Kingdom 18 -Mineral of the Month 19 -Mineralienatlas (Deutsch) 20 - Minerals of Wisconsin 21 - Philatelic Mineralogy 22 -QUT Mineral Atlas 23 - Scandinavian mineral gallery 24 - UCLA - Petrography Thin-Sections 25 -University of Colorado - Mineral Structure Data 26 -University of Texas at Austin 27 - WWW-MINCRYST

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Almandine

Fe++3Al2(SiO4)3
Dana No: 51.4.3a.2 Strunz No: VIII/A.08-20
Locality:

 

Notes:

 
 
   
 
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