# Humite

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> Source: https://en.wikipedia.org/wiki/Humite
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{{Short description|Nesosilicate mineral}}
{{Infobox mineral
| name        = Humite
| category    = [Nesosilicates](/source/Silicate_minerals)
| image       = Humite-155029.jpg
| imagesize   = 260px
| caption     = Humite specimen, Italy
| formula     = (Mg,Fe)<sub>7</sub>(SiO<sub>4</sub>)<sub>3</sub>(F,OH)<sub>2</sub>.
| IMAsymbol   = Hu<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.AF.50
| system      = [Orthorhombic](/source/Orthorhombic)
| class       = Dipyramidal (mmm) <br/>[H–M Symbol](/source/H%E2%80%93M_Symbol): (2/m 2/m 2/m)
| symmetry    = ''Pbnm''
| unit cell   = a = 10.24, b = 20.72 <br/>c = 4.73&nbsp;[Å]; Z&nbsp;=&nbsp;4
| color       = White, yellow, dark orange, brown
| habit       = 
| twinning    = 
| cleavage    = Poor
| fracture    = Uneven to subconchoidal
| tenacity    = Brittle
| mohs        = 6–6.5
| luster      = Vitreous
| refractive  = n<sub>α</sub> =1.607–1.643, n<sub>β</sub>=1.619–1.653, n<sub>γ</sub>=1.639–1.675
| opticalprop = Biaxial (+)  
| birefringence = 0.0320
| pleochroism = 
| dispersion  = Weak, r > v
| 2V          = Calculated = 70–78°, measured = 68–81°
| streak      = White
| gravity     = 3.20 – 3.32
| density     = 
| melt        = 
| fusibility  = 
| diagnostic  = 
| solubility  = 
| diaphaneity = Transparent
| other       = 
| references  = <ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/humite.pdf Handbook of Mineralogy]</ref><ref name=Webmin>[http://webmineral.com/data/Humite.shtml Webmineral data]</ref><ref name=Mindat>[http://www.mindat.org/min-1947.html Mindat w/ locations]</ref>
}}
{{for|the eponymous group of minerals|Humite (mineral group)}}

'''Humite''' is a [mineral](/source/mineral) found in the [volcanic](/source/volcanic)ally ejected masses of [Vesuvius](/source/Vesuvius). It was first described in 1813 and named for [Abraham Hume](/source/Sir_Abraham_Hume%2C_2nd_Baronet) (1749–1838).<ref>{{Cite book| last1 = Deer | first1 = W.  | last2 = Howie | first2 = R. | last3 = Zussman | first3 = J. | title = Rock-forming Minerals: Volume 1A, Second Edition, Orthosilicates | publisher = The Geological Society | date = 1997 | location = Bath, UK | isbn = 1-897799-88-8}}</ref>

==See also==
{{Portal|Earth sciences}}
* [Alleghanyite](/source/Alleghanyite)
* [Chondrodite](/source/Chondrodite)
* [Clinohumite](/source/Clinohumite)
* [Jerrygibbsite](/source/Jerrygibbsite)

==References==
{{reflist}}

==External links==
{{Commons category-inline}}

Category:Magnesium minerals
Category:Iron(II) minerals
Category:Gemstones
Category:Humite group
Category:Orthorhombic minerals
Category:Minerals in space group 62

{{silicate-mineral-stub}}

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