Silvialite Mineral Data (original) (raw)

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

Silvialite Image

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

Click Here for Larger Silvialite Image Silvialite 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 - 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),

Click Here for Large Silvialite Structure Window 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

| | Teertstra D K , Schindler M , Sherriff B L , Hawthorne F C , Mineralogical Magazine , 63 (1999) p.321-329, Silvialite, a new sulfate-dominant member of the scapolite group with, an Al-Si composition near the I4/m-P42/n phase transition, Locality: McBride Province, Australia | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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:

76.03.01.03 (76)Tectosilicate Al-Si Framework

(76.03)with other Be/Al/Si frameworks

(76.03.01)Scapolite group

76.03.01.00 Scapolite* (Na,Ca)4[Al3Si9O24]Cl P 41/n 4/m

76.03.01.01 Marialite Na4Al3Si9O24Cl I 4/m 4/m

76.03.01.02 Meionite Ca4Al6Si6O24CO3 P 4/m 4/m

76.03.01.03 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

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

Silvialite

(Ca,Na)4Al6Si6O24(SO4,CO3)
Dana No: 76.03.01.03 Strunz No: 09.FB.15
Locality:

Notes: