# Grossite

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> Source: https://en.wikipedia.org/wiki/Grossite
> Source revision: 1313212407
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{{Short description|Oxide mineral}}
{{Infobox mineral
| name    = Grossite
| image       =Grossite.png
| alt         =
| caption     =
| category    = [Oxide minerals](/source/Oxide_minerals)
| formula     = CaAl<sub>4</sub>O<sub>7</sub>
| IMAsymbol   = Gss<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      = 4.CC.15
| dana        = 07.03.02.01
| system      = [Monoclinic](/source/Monoclinic)
| class       = Prismatic (2/m) <br/><small>(same [H-M symbol](/source/H-M_symbol))</small>
| symmetry    = ''C2/c''
| unit cell   = a = 12.94, b = 8.91 <br/>c = 5.44&nbsp;[Å]; β = 107.01°; Z&nbsp;=&nbsp;4
| color       = Colorless to white
| colour      =
| habit       = Lathlike or subhedral rounded grains in polycrystalline aggregates rimmed by melilite (in meteorites)
| twinning    =
| cleavage    =
| fracture    =
| tenacity    =
| mohs        =
| luster      = Vitreous
| streak      = White
| diaphaneity = Transparent
| gravity     = 2.88
| density     =
| polish      =
| opticalprop = Biaxial (+)
| refractive  = nα = 1.618 nβ = 1.618 nγ = 1.652
| birefringence = δ = 0.034
| pleochroism =
| 2V          = Measured: 15°
| dispersion  =
| extinction  =
| length fast/slow =
| fluorescence =
| absorption  =
| melt        =
| fusibility  =
| diagnostic  =
| solubility  =
| impurities  =
| alteration  =
| other       =
| prop1       =
| prop1text   =
| references = <ref name=HBM/><ref name=Mindat/><ref name=Webmin/>
}}
'''Grossite''' is a calcium aluminium [oxide mineral](/source/oxide_mineral) with formula CaAl<sub>4</sub>O<sub>7</sub>. It is a colorless to white vitreous mineral which crystallizes in the [monoclinic](/source/monoclinic) [crystal system](/source/crystal_system).<ref name=Mindat>[http://www.mindat.org/min-1754.html Mindat.org]</ref><ref name=Webmin>[http://webmineral.com/data/Grossite.shtml Webmineral data]</ref>

Grossite was first described 1994 for an occurrence in the [Hatrurim Formation](/source/Hatrurim_Formation) of [Israel](/source/Israel). It was named for [Shulamit Gross](/source/Shulamit_Gross) (1923–2012) of the [Geological Survey of Israel](/source/Geological_Survey_of_Israel).<ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/grossite.pdf Handbook of Mineralogy]</ref><ref name=Webmin/>

It occurs within high temperature [metamorphosed](/source/Metamorphism) impure [limestone](/source/limestone) of the Hatrurim Formation and also within calcium-aluminium rich inclusions in [chondritic meteorite](/source/chondrite)s. Associated minerals in the Hatrurium include [brownmillerite](/source/brownmillerite), [mayenite](/source/mayenite) and [larnite](/source/larnite). In meteorites it occurs with [perovskite](/source/perovskite), [melilite](/source/melilite), [hibonite](/source/hibonite), [spinel](/source/spinel) and calcium rich [pyroxene](/source/pyroxene).<ref name=HBM/>

==See also==
* [Glossary of meteoritics](/source/Glossary_of_meteoritics)
 
==References==
{{Reflist}}

{{Meteorites}}

Category:Oxide minerals
Category:Monoclinic minerals
Category:Minerals in space group 15
Category:Meteorite minerals

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