Grossular Mineral Data

Advertisment

McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs

Adamsminerals.com- Online mineral store front for mineral collectors

For more than thirty (30) years, Excalibur Mineral Corp. has been providing private collectors, researchers, major universities and museums throughout the world with reliably identified, rare and unusual mineral samples for science an

Your premier supplier of quality mineral specimens from Southern Africa and the world at large

General Grossular Information

Chemical Formula:

Ca3Al2(SiO4)3

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

Empirical Formula:

Ca₃Al₂(SiO₄)₃

Environment:

Contact metasomatic deposits.

IMA Status:

Valid Species (Pre-IMA) 1811

Locality:

Isle of Mull, Scotland. Link to MinDat.org Location Data.

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.

Name Pronunciation:

Grossular + Pronunciation

Synonym:

Grossularite

Hessonite - brownish orange

ICSD 24944

PDF 39-368

Tsavorite - emerald green

Grossular Image

Images:

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

Images:

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

Images:

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

Cell Dimensions:

a = 11.851, Z = 8; V = 1,664.43 Den(Calc)= 3.59

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/I_o): 2.65(1), 1.58(0.9), 2.96(0.8),

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: ( 2 1 1)

Warning: this large pop-up is very compute intensive and may not work well with some computers.

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 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

Cleavage:

{???} Distinct

Color:

Brown, Colorless, Green, Gray, Yellow.

Density:

3.42 - 3.72, Average = 3.57

Diaphaneity:

Transparent to subtranslucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

6.5-7.5

Luminescence:

Fluorescent, Short UV=pink, Long UV=orange.

Luster:

Vitreous - Resinous

Streak:

brownish white

Optical Properties of Grossular

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

Optical Data:

Isotropic, n=1.734-1.75.

Calculated Properties of Grossular

Electron Density:

Bulk Density (Electron Density)=3.55 gm/cc
note: Specific Gravity of Grossular =3.57 gm/cc.

Fermion Index:

Fermion Index = 0.0093002212
Boson Index = 0.9906997788

Photoelectric:

PE_Grossular= 4.35 barns/electron
U=PE_Grossular x rElectron Density= 15.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Grossular is Not Radioactive

Grossular Classification

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

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

References:

NAME( Duda&Rejl90) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

Search for Grossular using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Grossular :

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

Ask about Grossular 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 Español

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:

Notes: