Andradite Mineral Data + Say ANDRADITE


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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 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.
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Andradite

Comments: Andradite (var. Demantoid) Garnet.
Location: Namgar mine, Erongo Mts. Namibia. Scale: 3.5 x 3.2 cm.
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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 - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.696(1), 1.6112(0.6), 3.015(0.6),
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.791-823, The crystal chemistry of the silicate garnets, sample An

View Additional jPOWD Structure files for Andradite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [3] [30] [4] [5] [6] [7] [8] [9]
 

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 Diaphaniety: Diaphaniety: 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: None.
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
Help on Optical Data: Optical Data: Isotropic, n=1.87-1.89.
 

Calculated Properties of Andradite

Help on Electron Density: Electron Density:

relectron=3.84 gm/cc
note: rAndradite =3.90 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.0129
Boson Index = 0.9871
Help on Photoelectric: Photoelectric:

PEAndradite = 10.08 barns/electron
U=PEAndradite x relectron= 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: 51.4.3b.1 (51)Nesosilicate Insular SiO4 Groups Only
  (51.4)with cations in [6] and >[6] coordination
  (51.4.3b)Garnet group (Ugrandite series)
 
51.4.3b.1 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m
 
51.4.3b.2 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.4.3b.3 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
51.4.3b.4 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m
 
51.4.3b.5 Yamatoite? (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m
Help on Strunz Class: Strunz Class: VIII/A.08-110 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 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 - Applied Mineralogy 6 -Athena 7 - CalTech Mineral Spectroscopy 8 - Crocoite.com Mineral Locations 9 - EUROmin Project 10 - Franklin Minerals(Dunn) 11 - Franklin Minerals(Palache) 12 -Google Images 13 -Google Scholar 14 -Handbook of Mineralogy (MinSocAm) 15 -Handbook of Mineralogy (UofA) 16 - HyperPhysics 17 -MinDAT 18 -MinMax(Deutsch) 19 -MinMax(English) 20 - Mineral and Gemstone Kingdom 21 -Mineral of the Month 22 -Mineralienatlas (Deutsch) 23 - Minerals of Wisconsin 24 - Philatelic Mineralogy 25 -QUT Mineral Atlas 26 - Scandinavian mineral gallery 27 - Tradeshop.com - The Rainbow of Gems 28 - UCLA - Petrography Thin-Sections 29 -University of Colorado - Mineral Structure Data 30 -University of Texas at Austin 31 - WWW-MINCRYST 32 -École des Mines de Paris

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Andradite

Ca3Fe+++2(SiO4)3
Dana No: 51.4.3b.1 Strunz No: VIII/A.08-110
Locality:

 

Notes:

 
 
   
 
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