Sanbornite

Phyllosilicate mineral
(repeating unit)Ba(Si2O5)IMA symbolSabn[1]Strunz classification9.EF.10Crystal systemOrthorhombicCrystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)Space groupPmcnUnit cella = 4.62 Å, b = 7.68 Å
c = 13.52 Å; Z = 4IdentificationFormula mass273.50 g/molColorColorless, WhiteCrystal habitPlaty modulated layersCleavagePerfectMohs scale hardness5LusterVitreousStreakWhiteDiaphaneityTransparent to translucentSpecific gravity3.74Optical propertiesBiaxial (−)Refractive indexnα = 1.597, nβ = 1.616, nγ = 1.624Birefringenceδ = 0.0270DispersionWeakReferences[2][3]

Sanbornite is a rare barium phyllosilicate mineral with formula BaSi2O5. Sanbornite is a colorless to white to pale green, platey orthorhombic mineral with Mohs hardness of 5 and a specific gravity of 3.74.

It was first described from Incline, Mariposa County, California in 1932[4] and named for mineralogist Frank B. Sanborn (1862–1936).

See also

Footnotes

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Sanbornite: Sanbornite mineral information and data
  3. ^ Sanbornite Mineral Data
  4. ^ Rogers, A.F. (1932) Sanbornite, a new barium silicate mineral from Mariposa County, California. Amer. Mineral., 17, 161–172

References

  • Mindat w/ locations
  • Webmineral w/ images
  • Mineral galleries


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