Mineralogy Database

Andradite Mineral Data

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General Andradite Information

Help on Chemical  Formula: Chemical Formula: Ca3Fe+++2(SiO4)3
Help on Composition: Composition: Molecular Weight = 508.18 gm
   Calcium  23.66 %  Ca   33.11 % CaO
   Iron     21.98 %  Fe   28.28 % FeO
   Silicon  16.58 %  Si   35.47 % SiO2
   Oxygen   37.78 %  O
           ______        ______ 
           100.00 %       96.85 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Fe2+2(SiO4)3
Help on Environment: Environment: Igneous and metamorphic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1868
Help on Locality: Locality: Magnet Cove, Arkansas. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Andradite is named after the Brazilian mineralogist J. B. de Andrada e Silva (1763-1838). Demantoid is named after its adamantine luster.
Help on Name Pronunciation: Name Pronunciation: Andradite + Pronunciation Say ANDRADITE
Help on Synonym: Synonym: Demantoid - green
  ICSD 27370
  Melanite - black
  PDF 10-288
  Topazolite - yellow
 

Andradite Image

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  Andradite   Clinochlore

Comments: Transparent topazolite, the yellow variety of andradite on clinochlore.
Location: Yellow Cat Mine, New Idria District, San Benito County. California, USA. Scale: 2.7 x 2.5 cm.
© Fabre Minerals

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  Andradite

Comments: Andradite (var. Demantoid) Garnet.
Location: Namgar mine, Erongo Mts. Namibia. Scale: 3.5 x 3.2 cm.
© Fabre Minerals

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  Glagolevite   Andradite

Comments: Pearly white plates of glagolevite with olive-colored andradite dodecohedrons.
Location: Zheleznyi Mine (Iron Mine), Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 12x10 mm.
© Pavel M. Kartashov

Andradite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 12.05, Z = 8; V = 1,749.69 Den(Calc)= 3.86
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): 2.696(1), 1.6112(0.6), 3.015(0.6),
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Physical Properties of Andradite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black, Yellowish brown, Red, Greenish yellow, Gray.
Help on Density: Density: 3.7 - 4.1, Average = 3.9
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Andradite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.149 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.16 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.228,KPDmeas= 0.2256,KC= 0.1965
Ncalc = 1.73 - 1.81
Help on Optical Data: Optical Data: Isotropic, n=1.87-1.89.
 

Calculated Properties of Andradite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.84 gm/cc
note: Specific Gravity of Andradite =3.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAndradite = 10.08 barns/electron
U=PEAndradite x rElectron Density= 38.70 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Andradite is Not Radioactive
 

Andradite Classification

Help on  Dana Class: Dana Class: 51.04.03b.01 (51)Nesosilicate Insular SiO4 Groups Only
  (51.04)with cations in [6] and >[6] coordination
  (51.04.03b)Garnet group (Ugrandite series)
 
51.04.03b.01 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03b.02 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03b.03 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03b.04 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03b.05 Yamatoite? (Mn,Ca)3(V,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 Andradite Information

Help on References: References: NAME( ODonoghue90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Andradite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - CalTech Mineral Spectroscopy
7 - EUROmin Project
8 - Ecole des Mines de Paris
9 - Franklin Minerals(Dunn)
10 - Franklin Minerals(Palache)
11 - GeoScienceWorld
12 - Google Images
13 - Google Scholar
14 - Handbook of Mineralogy (MinSocAm)
15 - Handbook of Mineralogy (UofA)
16 - HyperPhysics
17 - MinDAT
18 - Mineral and Gemstone Kingdom
19 - Mineral of the Month
20 - Mineralienatlas (Deutsch)
21 - Online Mineral Museum
22 - Philatelic Mineralogy
23 - QUT Mineral Atlas
24 - Ruff.Info
25 - Scandinavian mineral gallery
26 - Tradeshop.com - The Rainbow of Gems
27 - UCLA - Petrography Thin-Sections
28 - University of Colorado - Mineral Structure Data
29 - University of Texas at Austin
30 - WWW-MINCRYST

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

Andradite

Ca3Fe+++2(SiO4)3
Dana No: 51.04.03b.01 Strunz No: 09.AD.25
Locality:

 

Notes:

 

 
   
 


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