Sanbornite

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Sanbornite
Sanbornite with celsian.jpg
Sanbornite (white) with celsian (gray)—Incline, Maricopa County, California
General
Category Phyllosilicate minerals
Formula Ba(Si2O5)
IMA symbol Sabn [1]
Strunz classification 9.EF.10
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group Pmcn
Unit cell a = 4.62  Å, b = 7.68 Å
c = 13.52 Å; Z = 4
Identification
Formula mass 273.50 g/mol
ColorColorless, White
Crystal habit Platy modulated layers
Cleavage Perfect
Mohs scale hardness5
Luster Vitreous
Streak White
Diaphaneity Transparent to translucent
Specific gravity 3.74
Optical propertiesBiaxial (−)
Refractive index nα = 1.597, nβ = 1.616, nγ = 1.624
Birefringence δ = 0.0270
Dispersion Weak
References [2] [3]

Sanbornite is a rare barium phyllosilicate mineral with formula Ba Si 2 O 5. Sanbornite is a colorless to white to pale green, platey orthorhombic mineral with Mohs hardness of 5 and a specific gravity of 3.74.

Contents

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

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