Almandine Mineral Data

Almandine Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About


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

Click Here for Larger Almandine Image in a New Browser Window Images:
Click Here for Larger Almandine Image

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
Click Here for Larger Almandine Image in a New Browser Window Images:
Click Here for Larger Almandine Image

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:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: ( 1 1 2)

Warning: this large pop-up is very compute intensive and may not work well with some computers.
Click Here for Large Almandine Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


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 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

Search for Almandine using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Almandine :

A Bijoux Google Search for Almandine
Adam's Minerals Google Search for Almandine
Cape Minerals Google Search for Almandine
Dakota Matrix Minerals Google Search for Almandine
Excalibur Mineral Corp. Google Search for Almandine
Exceptional Minerals Google Search for Almandine
John Betts Fine Minerals Search for Almandine
McDougall Minerals Google Search for Almandine
Mineral News Website Link
Rock and Mineral Shows Google Search for Almandine
Weinrich Minerals, Inc. Google Search for Almandine

Ask about Almandine here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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: