Mineralogy Database

Silvialite Mineral Data

Search Webmineral :

General Silvialite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na)4Al6Si6O24(SO4,CO3)
Help on Composition: Composition: Molecular Weight = 939.25 gm
   Sodium     2.45 %  Na    3.30 % Na2O
   Calcium   12.80 %  Ca   17.91 % CaO
   Aluminum  17.24 %  Al   32.57 % Al2O3
   Silicon   17.94 %  Si   38.38 % SiO2
   Carbon     0.51 %  C     1.87 % CO2
   Sulfur     2.05 %  S     5.11 % SO3
   Oxygen    47.01 %  O
            ______        ______ 
            100.00 %       99.15 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3NaAl6Si6O24(SO4)0.6(CO3)0.4
Help on Environment: Environment: Garnet-granulite mantle-derived xenolith in olivine nephelinite. A member of the scapolite group.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: McBride Province, North Queensland, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Silvia Hillebrand, daughter of G. Tschermak, was first suggested in 1914 for the then-hypothetical SO4 analog of meionite.
Help on Synonym: Synonym: ICSD 88935

Silvialite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: BSE image of silvialite (Sil), plagioclase (An70)-calcite symplectite (P-C) corona, and plagioclase (An45, P). MinMag, v63:321.
Location: Upper-mantle garnet-granulite xenoliths hosted by olivine nephelinite, from McBride Province, North Queensland, Australia. Scale: Scale Bar 100 µm.
© Mineralogical Magazine

Silvialite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.62436
Help on Cell Dimensions: Cell Dimensions: a = 12.134, c = 7.576, Z = 2; V = 1,115.44 Den(Calc)= 2.80
Help on Crystal System: Crystal System: Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: I 4/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.45(1), 3.07(0.4), 3.82(0.2),2.69(0.15), 3.04(0.15),

Physical Properties of Silvialite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Slightly yellowish white, Colorless.
Help on Density: Density: 2.75
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Silvialite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2041,KPDmeas= 0.2078,KC= 0.2041
Ncalc = 1.56 - 1.57
Help on Optical Data: Optical Data: Uniaxial (-), e=1.558, w=1.585, bire=0.0270.

Calculated Properties of Silvialite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Silvialite =2.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0089869017
Boson Index = 0.9910130983
Help on Photoelectric: Photoelectric: PESilvialite = 2.94 barns/electron
U=PESilvialite x rElectron Density= 8.17 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Silvialite is Not Radioactive

Silvialite Classification

Help on  Dana Class: Dana Class: (76)Tectosilicate Al-Si Framework
  (76.03)with other Be/Al/Si frameworks
  (76.03.01)Scapolite group Scapolite* (Na,Ca)4[Al3Si9O24]Cl P 41/n 4/m Marialite Na4Al3Si9O24Cl I 4/m 4/m Meionite Ca4Al6Si6O24CO3 P 4/m 4/m Silvialite! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m
Help on  Strunz Class: Strunz Class: 09.FB.15 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FB -Tektosilicates with additional anions
09.FB.15 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m
09.FB.15 Marialite Na4Al3Si9O24Cl I 4/m 4/m
09.FB.15 Scapolite* (Na,Ca)4[(Al,Si)12O24]Cl P 41/n 4/m
09.FB.15 Silvialite! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m

Other Silvialite Information

Help on References: References: NAME( AmMin, V85, p264) PHYS. PROP.(AmMin, V85, p264) OPTIC PROP.(AmMin, V85, p264)
Help on See Also: See Also: Links to other databases for Silvialite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Silvialite using:

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

Visit our Advertisers for Silvialite :

Ask about Silvialite 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 Espaņol

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


Dana No: Strunz No: 09.FB.15





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.