Bakerite

Bakerite

Bakerite sample
General
Category Nesosilicate
Formula
(repeating unit)
Ca4B4(BO4)(SiO4)3(OH)3·H2O
Strunz classification 09.AJ.20
Crystal system Monoclinic
Unit cell

a = 4.85Å, b = 7.627Å, c = 9.659Å

β = 90.255°
Identification
Color Colorless, white
Crystal symmetry 2/m - Prismatic
Mohs scale hardness
Luster Vitreous, dull
Diaphaneity Translucent
Specific gravity 2.88
Optical properties Biaxial (-)
Refractive index nα = 1.624 nβ = 1.635 nγ = 1.654
Birefringence δ = 0.030
2V angle Measured: 87° to 88°

Bakerite is the common name given to hydrated calcium boro-silicate hydroxide, a borosilicate mineral (chemical formula Ca4B4(BO4)(SiO4)3(OH)3·(H2O)) that occurs in volcanic rocks in the Baker, California area.[1]

It was first described in 1903 for an occurrence in the Corkscrew Canyon Mine of the Black Mountains, Furnace Creek District, Death Valley National Park, Inyo County, California, US.[2] It was named for Richard C. Baker, a director of the Pacific Coast Borax Company.[3][4]

References

  1. "Bakerite mineral data". WebMineral.com. Archived from the original on 5 April 2009. Retrieved 2009-05-08.
  2. Mindat.org
  3. Handbook of Mineralogy
  4. Hildebrand, GH. (1982) Borax Pioneer: Francis Marion Smith. San Diego: Howell-North Books. p. 89. (ISBN 0-8310-7148-6)


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