Faujasite-Na

(Na,Ca,Mg)2(Si,Al)12O24 · 15H2O
IMA status
  • Approved
  • Grandfathered
IMA symbol
Fau-Na
Also known as
  • Faujasiet-Na

Where it forms, where it's found

Type locality
Limberg Quarries
  1. Sasbach am Kaiserstuhl
  2. Emmendingen
  3. Freiburg Region
  4. Baden-Württemberg
  5. Germany

48.1490°, 7.6028°

14recorded occurrences
Source · OpenStreetMap

Physical

Hardness
123456789105/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond
Lustre
Vitreous

Optical

Optical type
Isotropic
Isotropy testPPL ↔ XPL diagnostic
PPL intrinsic colour; no change on stage rotation
XPL extinct at every orientation

Crystallography

Crystal system
Isometric
Space group
Fd-3m
Cell parameters
a = 24.68(4) Å
Z
4
Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen3915.999623.961
41.88%
14SiSiliconSilicon1228.085337.020
22.62%
13AlAluminiumAluminium1226.982323.784
21.74%
20CaCalciumCalcium240.07880.156
5.38%
12MgMagnesiumMagnesium224.30548.610
3.26%
11NaSodiumSodium222.99045.980
3.09%
1HHydrogenHydrogen301.00830.240
2.03%
Total1489.751100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • Faujasiet-Na

In other languages

German
Faujasit-Na
Spanish
Faujasita-Na
Italian
faujasite-Na
Chinese
钠八面沸石

Classification

Strunz
10th ed.

9.GD.30

  • 9SilicatesClass
  • 9.GTektosilicates with zeolitic H2O; zeolite familyDivision
  • 9.GDChains of 6-membered rings – tabular zeolitesGroup
  • 9.GD.30Faujasite-NaSpecies

Group, growth & confusion

In the same group
2 members

Literature, links & citation

Citations
  1. 1958Bergerhoff, G., Baur, W.H., Nowacki, W. (1958) Über die Kristallstruktur des Faujasites. Neues Jahrbuch für Mineralogie, Monatshefte: 1958: 193-200.
  2. 1997Coombs, Douglas S., Alberti, Alberto, Armbruster, Thomas, Artioli, Gilberto, Colella, Carmine, Galli, Ermanno, Grice, Joel D., Liebau, Friedrich, Mandarino, Joseph A., Minato, Hideo, et al. (1997) Recommended nomenclature for zeolite minerals; report of the Subcommittee on Zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadian Mineralogist, 35 (6). 1571-1606
  3. 2001(2001) Faujasite-Na. Handbook of Mineralogy. Mineralogical Society of America
  4. 2018Fantini, Riccardo, Arletti, Rossella, Pastero, Linda, Quartieri, Simona, Di Renzo, Francesco, Cámara, Fernando, Vezzalini, Giovanna (2018) Structure of natural and NH4-exchanged Sasbach faujasite: a single-crystal study. European Journal of Mineralogy, 30 (3) 515-523 doi:10.1127/ejm/2018/0030-2745DOI: 10.1127/ejm/2018/0030-2745
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Faujasite-Na — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/faujasite-na-6922},
  note      = {Accessed 2026-05-11}
}