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Grossular Mineral Data

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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 Name Pronunciation: Name Pronunciation: Grossular + Pronunciation Say GROSSULAR
Help on Synonym: Synonym: Grossularite
  Hessonite - brownish orange
  ICSD 24944
  PDF 39-368
  Tsavorite - emerald green
 

Grossular Image

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  Diopside   Grossular

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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  Vesuvianite   Grossular

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 - 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): 2.65(1), 1.58(0.9), 2.96(0.8),
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Forms: ( 2 1 1)

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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 Diaphaneity: Diaphaneity: 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: Fluorescent, Short UV=pink, Long UV=orange.
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
Ncalc = 1.71 - 1.78
Help on Optical Data: Optical Data: Isotropic, n=1.734-1.75.
 

Calculated Properties of Grossular

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.55 gm/cc
note: Specific Gravity of Grossular =3.57 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0093002212
Boson Index = 0.9906997788
Help on Photoelectric: Photoelectric: PEGrossular = 4.35 barns/electron
U=PEGrossular x rElectron Density= 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: 51.04.03b.02 (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 Grossular Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Collectors Book of Fluorescent Minerals) 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 - Athena
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineral and Gemstone Kingdom
14 - Mineral of the Month
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - Philatelic Mineralogy
18 - QUT Mineral Atlas
19 - Ruff.Info
20 - Scandinavian mineral gallery
21 - UCLA - Petrography Thin-Sections
22 - University of Colorado - Mineral Structure Data
23 - University of Texas at Austin
24 - WWW-MINCRYST

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

Grossular

Ca3Al2(SiO4)3
Dana No: 51.04.03b.02 Strunz No: 09.AD.25
Locality:

 

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