Searlesite

Searlesite
Searlesite, near Green River, Wyoming
General
CategoryPhyllosilicate
Formula
(repeating unit)		NaBSi2O5(OH)2
IMA symbolSle[1]
Strunz classification9.EF.15
Crystal systemMonoclinic
Crystal classSphenoidal (2)
(same H-M symbol)
Space groupP21
Unit cella = 7.98 Å, b = 7.06 Å
c = 4.9 Å; β = 93.95°
Identification
ColorWhite, light brown
Mohs scale hardness1–2
LusterVitreous
Optical propertiesBiaxial (−)
Refractive indexnα = 1.516 nβ = 1.531 nγ = 1.535
Birefringenceδ = 0.019

Searlesite is a sodium borosilicate mineral, with the chemical formula NaBSi2O5(OH)2. It was discovered in 1914 at Searles Lake, California, and was named to honor John W. Searles (16 November 1828 – 7 October 1897), California pioneer, who drilled the well that yielded the first known Searlesite.

Searlesite is usually found disseminated in fine-grained lacustrine strata and often associated with altering volcanic ash. It may be a minor component of borate deposits, but it is rarely found concentrated or in megascopic crystals and so has not been developed as an ore mineral of boron. However, several lithium deposits including Rhyolite Ridge and Bonnie Claire intend to produce boric acid from searlesite in the future. XRD has shown some material in the high grade deep zone at Bonnie Claire is up to 38% searlesite, and is the primary ore mineral for their future boron extraction stream.[2] It occurs interbedded with oil shales or marls (Green River Formation, US) and in boron-bearing evaporite deposits (California, US); rarely in vugs in phonolite (Point of Rocks, New Mexico).

References

  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. ^ "Nevada Lithium Resources Identifies Extensive High-Grade Boron Mineralization up to 15,000 ppm in the High-Grade Lithium Zone at its Bonnie Claire Lithium Project". Junior Mining Network. 2024-05-22. Retrieved 2024-10-17.
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