{{Short description|Nesosilicate mineral}} {{Infobox mineral | name = Hodgkinsonite | boxwidth = | boxbgcolor = | image = Hodgkinsonite-256921.jpg | imagesize = 260px | alt = | caption = Hodgkinsonite from Franklin Mine, Franklin, New Jersey USA. The translucent and lustrous crystals reach 8 mm and the main crystal here is doubly terminated. | category = Nesosilicate | formula = Zn<sub>2</sub>MnSiO<sub>4</sub>(OH)<sub>2</sub> | IMAsymbol = Hgk<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 = | strunz = 9.AE.20 | system = Monoclinic | class = Prismatic (2/m) <br/><small>(same H-M symbol)</small> | symmetry = ''P2''<sub>1</sub>/a | unit cell = a = 11.76, b = 5.31 <br/>c = 8.18&nbsp;[Å]; β = 95.42°, Z&nbsp;=&nbsp;4 | color = | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | mohs = {{frac|4|1|2}} - 5 | luster = | streak = | diaphaneity = | gravity = | density = | polish = | opticalprop = Biaxial (-) | refractive = n<sub>α</sub> = 1.720 n<sub>β</sub> = 1.741 n<sub>γ</sub> = 1.746 | birefringence = δ = 0.026 | pleochroism = | 2V = | dispersion = r < v moderate | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }}

'''Hodgkinsonite''' is a rare zinc manganese silicate mineral Zn<sub>2</sub>MnSiO<sub>4</sub>(OH)<sub>2</sub>. It crystallizes in the monoclinic system and typically forms radiating to acicular prismatic crystals with variable color from pink, yellow-red to deep red. Hodgkinsonite was discovered in 1913 by H. H. Hodgkinson, for whom it is named in Franklin, New Jersey, and it is only found in that area.<ref>[http://mineral.galleries.com/minerals/silicate/hodgkins/hodgkins.htm Mineral Galleries] {{Webarchive|url=https://web.archive.org/web/20081018221324/http://mineral.galleries.com/minerals/silicate/hodgkins/hodgkins.htm |date=2008-10-18 }}. Accessed August 22, 2008.</ref>

==References== {{Reflist}} *http://rruff.geo.arizona.edu/doclib/hom/hodgkinsonite.pdf Manual of Mineralogy *http://webmineral.com/data/Hodgkinsonite.shtml Webmineral *http://www.mindat.org/min-1913.html Mindat ==External links==

*http://franklin-sterlinghill.com/palache/hodgkinsonite.stm {{Commons}}

Category:Nesosilicates Category:Geology of New Jersey Category:Monoclinic minerals Category:Minerals in space group 14

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