Stevensite

{{Short description|Smectite, questionable phyllosilicate mineral}}

{{Infobox mineral

|image=300px

| IMAsymbol = Stv{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

|color=White, pale yellow, pale brown, pale pink

|mohs=2 1/2

|streak=White

}}

Stevensite is a white clay mineral composed of hydrated calcium, sodium and magnesium silicate, with the chemical formula

(Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂.{{Cite web|title=Wisconsin Geological & Natural History Survey » Stevensite |url=https://wgnhs.wisc.edu/minerals/stevensite/ |access-date=2021-09-05|website=wgnhs.wisc.edu|date=18 June 2021 }} The mineral is a member of smectite. The mineral is named after Edwin Augustus Stevens.{{Cite web|title=Stevensite|url=https://www.mindat.org/min-3770.html|access-date=2021-09-05|website=www.mindat.org}}

Stevensite can be found at the Dean Quarry.{{Cite book|last1=Kloprogge|first1=J. Theo|url=https://books.google.com/books?id=9CqlCgAAQBAJ&dq=Stevensite&pg=PA79|title=Photo Atlas of Mineral Pseudomorphism|last2=Lavinsky|first2=Rob|last3=Young|first3=Stretch|date=2017-08-02|publisher=Elsevier|isbn=978-0-12-803703-4|pages=79|language=en}}