bakerite
{{Short description|Borosilicate mineral}}
{{Infobox mineral
| name = Bakerite
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| image = Bakerite.jpg
| imagesize = 260px
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| caption = Bakerite sample
| category = Nesosilicate
| formula = Ca4B4(BO4)(SiO4)3(OH)3·H2O
| molweight =
| strunz = 9.AJ.20
| system = Monoclinic
| class = Prismatic (2/m)
(same H-M symbol)
| symmetry = P21/c
| unit cell = a = 4.85 Å,
b = 7.627 Å,
c = 9.659 Å; β = 90.255°; Z = 1
| color = Colorless, white
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| mohs = {{frac|4|1|2}}
| luster = Vitreous, dull
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| diaphaneity = Translucent
| gravity = 2.88
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| polish =
| opticalprop = Biaxial (-)
| refractive = nα = 1.624 nβ = 1.635 nγ = 1.654
| birefringence = δ = 0.030
| pleochroism =
| 2V = Measured: 87° to 88°
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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.{{cite web|url=http://webmineral.com/data/Bakerite.shtml|title=Bakerite mineral data|accessdate=2009-05-08|work=WebMineral.com| archiveurl= https://web.archive.org/web/20090405145926/http://webmineral.com/data/Bakerite.shtml| archivedate= 5 April 2009 | url-status= live}} Discredited mineral: IMA2016-A.
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.[http://www.mindat.org/min-490.html Mindat.org] It was named for Richard C. Baker, a director of the Pacific Coast Borax Company.[http://rruff.geo.arizona.edu/doclib/hom/bakerite.pdf Handbook of Mineralogy]Hildebrand, GH. (1982) Borax Pioneer: Francis Marion Smith. San Diego: Howell-North Books. p. 89. ({{ISBN|0-8310-7148-6}})