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Silvialite

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About SilvialiteHide

Formula:
(Ca,Na)4(Al6Si6O24)(SO4,CO3)
Colour:
White, slightly yellowish
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.75
Crystal System:
Tetragonal
Member of:
Name:
For Silvia Hillebrand, daughter of Gustav Tschermak von Sessenegg (1836-1927), Austrian mineralogist. The name was first suggested in 1914 for the then-hypothetical sulphate analogue of Meionite.
Sulphate-dominant member of the Scapolite Group.



Classification of SilvialiteHide

Approved
Approval Year:
1998
9.FB.15

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions

Physical Properties of SilvialiteHide

Vitreous
Transparency:
Transparent
Colour:
White, slightly yellowish
Streak:
White
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
parallel to {100}
Fracture:
Conchoidal
Density:
2.75 g/cm3 (Measured)    2.77 g/cm3 (Calculated)

Optical Data of SilvialiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.585 nε = 1.558
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of SilvialiteHide

Formula:
(Ca,Na)4(Al6Si6O24)(SO4,CO3)
IMA Formula:
Ca4Al6Si6O24(SO4)

Crystallography of SilvialiteHide

Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
I4/m
Cell Parameters:
a = 12.160(3) Å, c = 7.560(1) Å
Ratio:
a:c = 1 : 0.622
Unit Cell V:
1,117.86 ų (Calculated from Unit Cell)
Z:
2
Comment:
Contains disordered carbonate and sulfate groups along the fourfold axis.

Occurrences of SilvialiteHide

Paragenetic Mode(s):

Type Occurrence of SilvialiteHide

Place of Conservation of Type Material:
Systematic Reference Series of the National Mineral Collection at the Geological Survey of Canada, Ottawa, Ontario, under catalogue number NMC 68080.
Geological Setting of Type Material:
mafic and ultramafic xenoliths from the lower crust or upper mantle
Associated Minerals at Type Locality:

Synonyms of SilvialiteHide

Other Language Names for SilvialiteHide

Relationship of Silvialite to other SpeciesHide

Member of:
Other Members of this group:
AlgeriteCa4Al6Si6O24CO3
MarialiteNa4Al3Si9O24ClTet. 4/m : I4/m
MeioniteCa4Al6Si6O24CO3Tet. 4/m : I4/m
ScapoliteThis term generally refers to just the marialite-meionite series, not the full scapolite group, ...Tet.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Pargasite2 photos of Silvialite associated with Pargasite on mindat.org.
Sanidine1 photo of Silvialite associated with Sanidine on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.FB.05Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6Trig. 3m : P3 1c
9.FB.05Bystrite(Na,K)7Ca(Al6Si6O24)(S5)ClHex.
9.FB.05Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
9.FB.05CancrisiliteNa7(Al5Si7O24)(CO3) · 3H2OHex.
9.FB.05Davyne(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2Hex. 6/m : P63/m
9.FB.05Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2OHex.
9.FB.05Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2Hex.
9.FB.05HydroxycancriniteNa8(Al6Si6O24)(OH)2 · 2H2OHex.
9.FB.05Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4Hex.
9.FB.05MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2Hex.
9.FB.05PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2OHex.
9.FB.05Quadridavyne(Na,K)6Ca2(Al6Si6O24)Cl4Hex.
9.FB.05Sacrofanite(Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6•2H2OHex.
9.FB.05Tounkite(Na,Ca,K)8(Al6Si6O24)(SO4)2Cl · H2OHex.
9.FB.05Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2OHex. 6 : P63
9.FB.05Marinellite(Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2OTrig. 3m : P3 1c
9.FB.05Farneseite(Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2OHex. 6/m : P63/m
9.FB.05Alloriite(Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6Trig. 3m : P3 1c
9.FB.05Fantappièite[Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2OTrig. 3 : R3
9.FB.05KyanoxaliteNa7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)Hex. 6 : P63
9.FB.05Balliranoite(Na,K)6Ca2(Si6Al6O24)Cl2(CO3)Hex. 6 : P63
9.FB.05CarbobystriteNa8(Al6Si6O24)(CO3) · 3.5H2OTrig. 3m : P3 1c
9.FB.05DepmeieriteNa8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x<0.5)Hex. 6 : P63
9.FB.05KircheriteNa5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2OTrig. 3 2 : R3 2
9.FB.10BicchuliteCa2(Al2SiO6)(OH)2Iso. 4 3m : I4 3m
9.FB.10DanaliteBe3Fe2+4(SiO4)3SIso. 4 3m : P4 3n
9.FB.10GenthelviteBe3Zn4(SiO4)3SIso. 4 3m : P4 3n
9.FB.10Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)Iso. 4 3m : P4 3n
9.FB.10HelvineBe3Mn2+4(SiO4)3SIso. 4 3m : P4 3n
9.FB.10KamaishiliteCa2(Al2SiO6)(OH)2Tet.
9.FB.10LazuriteNa6Ca2(Al6Si6O24)(SO4,S,S2, S3,Cl,OH)2Iso. 4 3m : P4 3n
9.FB.10NoseanNa8(Al6Si6O24)(SO4) · H2OIso. 4 3m : P4 3n
9.FB.10SodaliteNa8(Al6Si6O24)Cl2Iso. 4 3m : P4 3n
9.FB.10Tsaregorodtsevite(N(CH3)4)(AlSi5O12)Orth.
9.FB.10TugtupiteNa4BeAlSi4O12ClTet. 4 : I4
9.FB.15MarialiteNa4Al3Si9O24ClTet. 4/m : I4/m
9.FB.15MeioniteCa4Al6Si6O24CO3Tet. 4/m : I4/m

Fluorescence of SilvialiteHide

Other InformationHide

Notes:
faint deep-red cathodoluminesecnce.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for SilvialiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Teertstra, D. K., Schindler, M., Sherriff, B.L., Hawthorne, F.C. (1999): Silvialite, a new sulfate-dominant member of the scapolite group with an Al-Si composition near the I4/m-P42/n phase transition. Mineralogical Magazine 63, 321-329.
Neues Jahrbuch für Mineralogie, Geologie und Paläontologie: 39: 79-125.
Sokolova, E., Hawthorne, F.C. (2008): The crystal chemistry of the scapolite-group minerals. I. crystal structure and long-range order. The Canadian Mineralogist 46, 1527-1554.

Internet Links for SilvialiteHide

Localities for SilvialiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • Queensland
    • Charters Towers Region
      • McBride Province
[AmMin 85:264] MM 1999, 321-9; Stolz, A. J. (1987). Fluid activity in the lower crust and upper mantle: mineralogical evidence bearing on the origin of amphibole and scapolite in ultramafic and mafic granulite xenoliths. Mineralogical Magazine, 51(5), 719-732.
Canada
 
  • Québec
    • Côte-Nord
      • Manicouagan RCM
Teertstra D K, Schindler M, Sherriff B L, Hawthorne F C (1999) Silvialite, a new sulfate-dominant member of the scapolite group with an Al-Si composition near the I4/m-P42/n phase transition. Mineralogical Magazine 63, 321-329
Germany
 
  • Thuringia
    • Gera
      • Weida
Witzke, T. (2000): Lapis 25(1), 47-48; Richter, E. & Rüger, F. (2010): Lapis 35(2), 13-22, 54
Mineral and/or Locality  
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