Silvialite Mineral Data


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
  IMA1998-010
 

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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 - DipyramidalH-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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.78 gm/cc
note: rSilvialite =2.80 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00898
Boson Index = 0.99102
Help on Photoelectric: Photoelectric:

PESilvialite = 2.94 barns/electron
U=PESilvialite x relectron= 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: 76.3.1.3 (76)Tectosilicate Al-Si Framework
  (76.3)with other Be/Al/Si frameworks
  (76.3.1)Scapolite group
 
76.3.1.0 Scapolite* (Na,Ca)4[Al3Si9O24]Cl P 41/n 4/m
 
76.3.1.1 Marialite Na4Al3Si9O24Cl I 4/m 4/m
 
76.3.1.2 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m
 
76.3.1.3 Silvialite ! (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m
Help on  Strunz Class: Strunz Class: VIII/J.13-25 VIII - Silicates
  VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders
  VIII/J.13 - Sodalite group, Marialite - Kalborsite series
 
VIII/J.13-10 Marialite Na4Al3Si9O24Cl I 4/m 4/m
 
VIII/J.13-20 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m
 
VIII/J.13-25 Silvialite (Ca,Na)4Al6Si6O24(SO4,CO3) I 4/m 4/m
 
VIII/J.13-30 Sarcolite NaCa6Al4Si6O24F(?) I 4/m 4/m
 
VIII/J.13-40 Kalborsite K6Al4Si6BO20(OH)4Cl P 42m 4 2m
 

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 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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

Silvialite

(Ca,Na)4Al6Si6O24(SO4,CO3)
Dana No: 76.3.1.3 Strunz No: VIII/J.13-25
Locality:

 

Notes:

 

 
   
 
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