Mineralogy Database

Almandine Mineral Data

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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 Name Pronunciation: Name Pronunciation: Almandine + Pronunciation Say ALMANDINE
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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  Hypersthene   Almandine

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 - Hexoctahedral H-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),
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Forms: ( 1 1 2)

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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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.81 - 1.86
Help on Optical Data: Optical Data: Isotropic, n=1.83.
 

Calculated Properties of Almandine

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.08 gm/cc
note: Specific Gravity of Almandine =4.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAlmandine = 11.03 barns/electron
U=PEAlmandine x rElectron Density= 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: 51.04.03a.02 (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
Help on  Strunz Class: 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 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 - Athena
5 - CalTech Mineral Spectroscopy
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineral and Gemstone Kingdom
15 - Mineral of the Month
16 - Mineralienatlas (Deutsch)
17 - Online Mineral Museum
18 - Philatelic Mineralogy
19 - QUT Mineral Atlas
20 - Ruff.Info
21 - Scandinavian mineral gallery
22 - UCLA - Petrography Thin-Sections
23 - University of Colorado - Mineral Structure Data
24 - University of Texas at Austin
25 - WWW-MINCRYST

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Print or Cut-and-Paste your Almandine Specimen Label here :

Almandine

Fe++3Al2(SiO4)3
Dana No: 51.04.03a.02 Strunz No: 09.AD.25
Locality:

 

Notes:

 

 
   
 


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