Sanbornite

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Sanbornite
Sanbornite with celsian.jpg
sanbornite (white) with celsian (gray)—Incline, Maricopa County, California
General
Category Phyllosilicate
Formula
(repeating unit)
Ba(Si2O5)
Strunz classification 09.EF.10
Crystal symmetry Orthorhombic 2/m 2/m 2/m
Unit cell a = 4.62Å, b = 7.68Å, c = 13.52Å
Identification
Formula mass 273.50 g
Color Colorless, White
Crystal habit Platy modulated layers
Crystal system Orthorhombic – Dipyramidal
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 [1][2]

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 and named for mineralogist Frank B. Sanborn (1862–1936).

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