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Feldspathoid

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About FeldspathoidHide

A family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too little silica to form feldspar. There is considerable structural variation, so it is not a true group. Feldspathoids take the places of feldspars in igneous rocks that are undersaturated with respect to silica or that contain more alkalis and aluminium than can be accommodated in the feldspars. Feldspathoids commonly occur with feldspars, and also with amphiboles, olivine, and pyroxenes, but never with quartz or other polymorphs of silica.


Synonyms of FeldspathoidHide

Relationship of Feldspathoid to other SpeciesHide

Group Members:
Cancrinite Group 
  Afghanite (Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6Trig. 3m : P3 1c
  Alloriite (Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6Trig. 3m : P3 1c
  Balliranoite (Na,K)6Ca2(Si6Al6O24)Cl2(CO3)Hex. 6 : P63
  Biachellaite (Na,Ca,K)8(Al6Si6O24)(SO4)2(OH)0.5 · H2OTrig. 3 : P3
  Bystrite (Na,K)7Ca(Al6Si6O24)(S5)ClHex.
  Cancrinite (Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
  Cancrisilite Na7(Al5Si7O24)(CO3) · 3H2OHex.
  Carbobystrite Na8(Al6Si6O24)(CO3) · 3.5H2OTrig. 3m : P3 1c
  Davyne (Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2Hex. 6/m : P63/m
  Depmeierite Na8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x<0.5)Hex. 6 : P63
  Fantappièite [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2OTrig. 3 : R3
  Franzinite (Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2OHex.
  Giuseppettite (Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2Hex.
  Hydroxycancrinite Na8(Al6Si6O24)(OH)2 · 2H2OHex.
  Kircherite Na5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2OTrig. 3 2 : R3 2
  Kyanoxalite Na7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)Hex. 6 : P63
  Liottite (Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4Hex.
  Marinellite (Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2OTrig. 3m : P3 1c
  Microsommite Na4K2Ca2(Al6Si6O24)(SO4)Cl2Hex.
  Pitiglianoite Na6K2(Al6Si6O24)(SO4) · 2H2OHex.
  Quadridavyne (Na,K)6Ca2(Al6Si6O24)Cl4Hex.
  Sacrofanite (Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6•2H2OHex.
  Sulfhydrylbystrite Na5K2Ca[Al6Si6O24](S5)2(SH)Trig. 3m : P3 1c
  Tounkite (Na,Ca,K)8(Al6Si6O24)(SO4)2Cl · H2OHex.
  Vishnevite (Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2OHex. 6 : P63
Carnegieite NaAlSiO4Tric.
Davidsmithite (Ca,□)2Na6Al8Si8O32Hex. 6 : P63
Kalsilite KAlSiO4Hex. 6 2 2 : P63 2 2
Leucite K(AlSi2O6)Tet. 4/m : I41/a
Metaleucite 
Nepheline Na3K(Al4Si4O16)Hex. 6 : P63
Sodalite Group 
  Haüyne (Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)Iso. 4 3m : P4 3n
  Lazurite Na6Ca2(Al6Si6O24)(SO4,S,S2,S3,Cl,OH)2Iso. 4 3m : P4 3n
  Nosean Na8(Al6Si6O24)(SO4) · H2OIso. 4 3m : P4 3n
  Sodalite Na8(Al6Si6O24)Cl2Iso. 4 3m : P4 3n
  Tsaregorodtsevite (N(CH3)4)(AlSi5O12)Orth.
  Vladimirivanovite Na6Ca2(Al6Si6O24)(SO4,S3,S2,Cl)2 · H2OOrth. mmm (2/m 2/m 2/m)
Trikalsilite (K,Na)AlSiO4Hex.
Trinepheline NaAlSiO4Hex. 6 : P61
Yoshiokaite (Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3

Other InformationHide

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

Feldspathoid in petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

Internet Links for FeldspathoidHide

Localities for FeldspathoidHide

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 ListShow

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