{{infobox mineral | name = Scawtite | image = Scawtite.jpg | alt = | caption = | category = Silicate mineral | formula = Ca<sub>7</sub>(Si<sub>3</sub>O<sub>9</sub>)<sub>2</sub>CO<sub>3</sub>·2H<sub>2</sub>O | IMAsymbol = Scw<ref>{{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}}</ref> | strunz = 9.CK.15 | dana = 64.2.1.1 | system = Monoclinic | class = Prismatic (2/m) <br/><small>(same H-M symbol)</small> | symmetry = ''C2/m'' | unit cell = a = 10.12&nbsp;Å, b = 15.18&nbsp;Å <br/>c = 6.62&nbsp;Å; β = 100.55°; Z&nbsp;=&nbsp;2 | color = Colorless | habit = Platy - micaceous, parallel to radiating clusters | twinning = | cleavage = Perfect on {001}, poor on {010} | fracture = | tenacity = | mohs = 4–5 | luster = Vitreous | streak = | diaphaneity = Transparent | gravity = 2.77 | density = | polish = | opticalprop = Biaxial (+) | refractive = n<sub>α</sub> = 1.597 - 1.603 n<sub>β</sub> = 1.606 - 1.609 n<sub>γ</sub> = 1.618 - 1.621 | birefringence = δ = 0.021 | pleochroism = | 2V = Measured from 74° to 78° | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref name=HBM>[http://www.handbookofmineralogy.com/pdfs/scawtite.pdf Scawtite in the Handbook of Mineralogy]</ref><ref name=Mindat>[http://www.mindat.org/min-3552.html Scawtite on Mindat.org]</ref><ref name=Webmin>[http://www.webmineral.com/data/Scawtite.shtml#.VoaFYrY4HRY Scawtite data on Webmineral]</ref> }} '''Scawtite''' is a hydrous calcium silicate mineral with carbonate, formula: Ca<sub>7</sub>(Si<sub>3</sub>O<sub>9</sub>)<sub>2</sub>CO<sub>3</sub>·2H<sub>2</sub>O. It crystallizes in the monoclinic crystal system as thin plates or flat prisms.<ref name=Mindat/>

Scawtite was first described in 1929 for an occurrence at Scawt Hill in Northern Ireland.<ref name=Mindat/>

Scawtite occurs as in skarns and hydrothermal veins in limestone. Associated minerals include melilite, spurrite, tobermorite, thomsonite, larnite, grossular, bultfonteinite, calcite, analcime, foshagite and hillebrandite.<ref name=HBM/>

==References== {{Reflist}}

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Category:Silicate minerals Category:Monoclinic minerals Category:Minerals in space group 12