Davisite

{{short description|Inosilicate mineral}} {{Infobox mineral | name = Davisite | boxwidth = | boxbgcolor = | image = | imagesize = | alt = | caption = | struct image = | struct caption = | struct imagesize = | struct2 image = | struct2 caption = | struct2 imagesize= | SMILES = | Jmol = | category = Inosilicate minerals (single chain) | group = Pyroxene group, clinopyroxene subgroup | formula = CaScAlSiO₆ | IMAsymbol = | molweight = | strunz = | dana = | system = | class = | symmetry = | unit cell = | color = | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | toughness = | mohs = | luster = | streak = | diaphaneity = | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }} '''Davisite''' is an exceedingly rare mineral of the pyroxene group, with formula CaScAlSiO₆. It is the scandium-dominant member.<ref>Ma, C., and Rossmann, G.R., 2009: Davisite, CaScAlSiO₆, a new pyroxene from the Allende meteorite</ref><ref name=Mindat>Mindat, http://www.mindat.org/min-38829.html</ref> It stands for scandium-analogue of other pyroxene-group members, esseneite, grossmanite and kushiroite.<ref name=Mindat /> Davisite is one of scarce minerals containing essential scandium.<ref>[http://www.mindat.org/element/Scandium Scandium, The mineralogy of Scandium - Mindat. org]</ref>

It is named for Andrew M. Davis, an American meteoriticist and professor of astronomy and geoscience at the University of Chicago.

Based on a synthesized sample, the mineral likely crystallizes in the monoclinic crystal system with space group ''C2/c''.<ref>{{cite journal |last1=Ohashi |first1=H. |last2=Ii |first2=N. |journal=Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists |volume=73 |year=1978 |pages=267–273 |title=Structure of calcium scandium aluminum silicate (CaScAlSiO6)-pyroxene|doi=10.2465/ganko1941.73.267 |doi-access=free }}</ref>

==References== {{reflist}}

Category:Calcium minerals Category:Scandium minerals Category:Aluminium minerals Category:Monoclinic minerals Category:Minerals in space group 15 Category:Clinopyroxene subgroup

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