# Sweetite

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Sweetite
> Markdown URL: https://mediated.wiki/source/Sweetite.md
> Source: https://en.wikipedia.org/wiki/Sweetite
> Source revision: 1197258764
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Infobox mineral
| name        = Sweetite
| category    = Hydroxide mineral
| boxwidth    = 
| boxbgcolor  = 
| image       = 
| imagesize   = 
| caption     = 
| formula     = Zn(OH)<sub>2</sub>
| IMAsymbol   = Sw<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>
| molweight   = 99.40 g/mol
| strunz      = 4.FA.10
| system      = [Tetragonal](/source/Tetragonal) <br/>Unknown space group
| class       = Trapezohedral (422) <br/>[H-M symbol](/source/H-M_symbol): (422)
| symmetry    = ''P4<sub>1</sub>2<sub>1</sub>2'' (no. 92) or ''P4<sub>3</sub>2<sub>1</sub>2'' (no. 96)
| unit cell   = a = 8.22, c = 14.34&nbsp;[Å] <br/>V = 968.93&nbsp;Å<sup>3</sup>; Z&nbsp;=&nbsp;20
| color       = Colorless, white
| habit       = Bipyramidal
| twinning    = 
| cleavage    = None
| fracture    = Irregular
| tenacity    = 
| mohs  = 3
| luster      = Vitreous
| refractive = n<sub>ω</sub> = 1.635  n<sub>ε</sub> = 1.628
| opticalprop = Uniaxial (−) 
| birefringence = 0.007
| pleochroism = 
| streak      = White
| gravity     = 3.33 
| density     = 
| melt        = 
| fusibility  = 
| diagnostic  = 
| solubility  = 
| diaphaneity = Transparent to translucent
| other       = 
| references  = <ref name=Webmin>[http://webmineral.com/data/Sweetite.shtml Webmineral data]</ref><ref name=Mindat>[http://www.mindat.org/min-3846.html Mindat.org]</ref><ref>[http://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Sweetit Mineral Atlas]</ref><ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/sweetite.pdf Handbook of Mineralogy]</ref>
}}
'''Sweetite''' has a general formula of Zn(OH)<sub>2</sub>.<ref name=Webmin/> The name is given after a curator of mineral department of the British Museum, Jessie May Sweet (1901–1979).<ref>Ralph, Jolyon. "Sweetite" Mindat.org. 2010. 17 Sep 2010</ref> It occurs in an [oxidized](/source/oxidized) [vein](/source/Vein_(geology)) in [limestone](/source/limestone) bedrock with [galena](/source/galena), [ashoverite](/source/ashoverite), [wülfingite](/source/w%C3%BClfingite), [anglesite](/source/anglesite), [cerussite](/source/cerussite), [hydrocerussite](/source/hydrocerussite), [litharge](/source/litharge), [fluorite](/source/fluorite), [palygorskite](/source/palygorskite) and [calcite](/source/calcite).<ref name=HBM/>

Sweetite is [tetragonal](/source/tetragonal), which means crystallographically it contains one axis of unequal length and two axes of equal length. The angles between three of the axes are all 90°. It belongs to the space group 4/m. Some crystals show evidence of a basal plane and a few are tabular.<ref>Clark, A.M., Fejer, E.E., Couper, A.G., and Jones G.C. (1984) Sweetite, a new mineral from Derbyshire. Mineralogical Magazine, 48, 267–269.</ref> In terms of its optical properties, sweetite has two indices of refraction, 1.635 along the ordinary ray and 1.628 along the extraordinary ray.<ref>Ralph, Jolyon. "Sweetite" Mindat.org. 2010. 7 Nov 2010</ref> The index of refraction is the velocity of light in vacuum divided by the velocity of light in medium. It also has the birefringence of 0.007.<ref>"Sweetite" (http://webmineral.com/data/Sweetite.shtml). Mineral Data. http://webmineral.com/data/Sweetite.shtml. Retrieved 7 November 2010.</ref> The birefringence means the decomposition of light into two rays when passing through a mineral. Sweetite is 1.64–1.65 in relief, which is medium to high in intensity and means a measure of the relative difference between the index of refraction of a mineral and its surrounding medium.<ref name=Webmin/> 

Sweetite is mostly found from a limestone quarry 200–300 m northwest of Milltown, near Ashover, Derbyshire, England.<ref name=HBM/>

== References ==
{{Reflist}}

Category:Hydroxide minerals
Category:Zinc minerals
Category:Tetragonal minerals
Category:Minerals in space group 92
Category:Minerals in space group 96
Category:Minerals described in 1983

{{mineral-stub}}

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Adapted from the Wikipedia article [Sweetite](https://en.wikipedia.org/wiki/Sweetite) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Sweetite?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.