Grossular Mineral Data + Say GROSSULAR

General Grossular Information
Help on Chemical Formula: Chemical Formula: Ca3Al2(SiO4)3
Help on Composition: Composition: Molecular Weight = 450.45 gm
   Calcium   26.69 %  Ca   37.35 % CaO
   Aluminum  11.98 %  Al   22.64 % Al2O3
   Silicon   18.71 %  Si   40.02 % SiO2
   Oxygen    42.62 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Al2(SiO4)3
Help on Environment: Environment: Contact metasomatic deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1811
Help on Locality: Locality: Isle of Mull, Scotland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Grossular is from the Latin grossularia meaning "gooseberry." Hessonite is from the Greek hesson, meaning "slight" in reference to the smaller specific gravity.
Help on Synonym: Synonym: Grossularite
  Hessonite - brownish orange
  ICSD 24944
  PDF 39-368
  Tsavorite - emerald green
 

Grossular Image

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Grossular   Diopside

Comments: Pale blue prismatic crystal of diopside with orange-brown grossular.
Location: Val d'Aosta, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals
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Grossular

Comments: Gemmy, transparent, cinnamon-colored grossular crystals averaging 7 mm in size.
Location: Jeffrey mine, Asbestos, Quebec, Canada. Scale: 3.5 x 4 x 1.5 cm.
© Dan Weinrich
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Grossular   Vesuvianite

Comments: Blocky, tan-colored vesuvianite with white grossular (garnet).
Location: Sierra de la Cruz, Lago Jaco, Coahuila, Mexico. Scale: 3.5 x 4.5 cm.
© Fabre Minerals

Grossular Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 11.851, Z = 8; V = 1,664.43 Den(Calc)= 3.59
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): 2.65(1), 1.58(0.9), 2.96(0.8),
Help on Forms: Forms:

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Forms: [ 2 1 1]

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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 Mn-Gr

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

Physical Properties of Grossular

Help on Cleavage: Cleavage: [???] Distinct
Help on Color: Color: Brown, Colorless, Green, Gray, Yellow.
Help on Density: Density: 3.42 - 3.72, Average = 3.57
Help on Diaphaniety: Diaphaniety: Transparent to subtranslucent
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 6.5-7.5
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: brownish white
 

Optical Properties of Grossular

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2067,KPDmeas= 0.2078,KC= 0.2085
Help on Optical Data: Optical Data: Isotropic, n=1.734-1.75.
 

Calculated Properties of Grossular

Help on Electron Density: Electron Density:

relectron=3.55 gm/cc
note: rGrossular =3.57 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.0093
Boson Index = 0.9907
Help on Photoelectric: Photoelectric:

PEGrossular = 4.35 barns/electron
U=PEGrossular x relectron= 15.44 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Grossular is Not Radioactive
 

Grossular Classification
Help on Dana Class: Dana Class: 51.4.3b.2 (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.08-70 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 Grossular 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 Grossular :
1 - Alkali-Nuts(English) 2 -Am. Min. Crystal Structure Database 3 - Amethyst Galleries' Mineral Gallery 4 - Applied Mineralogy 5 -Athena 6 - Crocoite.com Mineral Locations 7 - Franklin Minerals(Dunn) 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 - HyperPhysics 13 -MinDAT 14 -MinMax(Deutsch) 15 -MinMax(English) 16 - Mineral and Gemstone Kingdom 17 -Mineral of the Month 18 -Mineralienatlas (Deutsch) 19 - Minerals of Wisconsin 20 - Philatelic Mineralogy 21 -QUT Mineral Atlas 22 - Scandinavian mineral gallery 23 - UCLA - Petrography Thin-Sections 24 -University of Colorado - Mineral Structure Data 25 -University of Texas at Austin 26 - WWW-MINCRYST

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Grossular

Ca3Al2(SiO4)3
Dana No: 51.4.3b.2 Strunz No: VIII/A.08-70
Locality:

 

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