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Sanbornite
Sanbornite
	Sanbornite (white) with celsian (gray)—Incline, Maricopa County, California
General
Category	Phyllosilicate
Formula; (repeating unit)	Ba(Si2O5)
IMA symbol	Sabn
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
Color	Colorless, White
Crystal habit	Platy modulated layers
Cleavage	Perfect
Mohs scale hardness	5
Luster	Vitreous
Streak	White
Diaphaneity	Transparent to translucent
Specific gravity	3.74
Optical properties	Biaxial (−)
Refractive index	nα = 1.597, nβ = 1.616, nγ = 1.624
Birefringence	δ = 0.0270
Dispersion	Weak
References

Sanbornite is a rare barium phyllosilicate mineral with formula Ba Si₂O₅. 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).

Footnotes

^ 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.
^ Sanbornite: Sanbornite mineral information and data
^ Sanbornite Mineral Data
^ Rogers, A.F. (1932) Sanbornite, a new barium silicate mineral from Mariposa County, California. Amer. Mineral., 17, 161–172

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