Humite: Difference between revisions

Humite
Humite
	Humite specimen, Italy
Allgemein
Kategorie	Nesosilicates
Formula; (repeating unit)	(Mg,Fe)7(SiO4)3(F,OH)2.
IMA symbol	Hu
Strunz classification	9.AF.50
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) ; H–M Symbol: (2/m 2/m 2/m)
Space group	Pbnm
Unit cell	a = 10.24, b = 20.72 ; c = 4.73 [Å]; Z = 4
Identification
Color	White, yellow, dark orange, brown
Cleavage	Poor
Fracture	Uneven to subconchoidal
Tenacity	Brittle
Mohs scale hardness	6–6.5
Luster	Vitreous
Streak	White
Diaphaneity	Transparent
Specific gravity	3.20 – 3.32
Optical properties	Biaxial (+)
Refractive index	nα =1.607–1.643, nβ=1.619–1.653, nγ=1.639–1.675
Birefringence	0.0320
2V angle	Calculated = 70–78°, measured = 68–81°
Dispersion	Weak, r > v
References

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Latest revision as of 21:26, 18 January 2024

Humite is a mineral found in the volcanically ejected masses of Vesuvius. It was first described in 1813 and named for Abraham Hume (1749–1838).^[5]

References

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ Handbook of Mineralogy
^ Webmineral data
^ Mindat w/ locations
^ Deer, W.; Howie, R.; Zussman, J. (1997). Rock-forming Minerals: Volume 1A, Second Edition, Orthosilicates. Bath, UK: The Geological Society. ISBN 1-897799-88-8.

External links

Media related to Humite at Wikimedia Commons

This article about a specific silicate mineral is a stub. You can help Wikipedia by expanding it.

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[HBM-2] Handbook of Mineralogy

[Webmin-3] Webmineral data

[Mindat-4] Mindat w/ locations

[5] Deer, W.; Howie, R.; Zussman, J. (1997). Rock-forming Minerals: Volume 1A, Second Edition, Orthosilicates. Bath, UK: The Geological Society. ISBN 1-897799-88-8.

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+{{Infobox mineral
-[[Image:Humite with Spinel.jpg|thumb|right|Humite specimen with [[spinel]] (purple) intergrowth]]
+| name        = Humite
-'''Humite''' is an [[orthorhombic]] mineral of a transparent vitreous brown to orange color. It is found in the [[volcanic]]ally ejected masses of [[Vesuvius]]. It is a [[Silicate minerals|nesosilicate]] of [[iron]] and [[magnesium]] which also contains [[fluorine]] and [[hydroxide]]. The formula is: ([[magnesium|Mg]],[[iron|Fe]])<sub>7</sub>([[silicon|Si]][[oxygen|O]]<sub>4</sub>)<sub>3</sub>([[fluorine|F]],O[[hydrogen|H]])<sub>2</sub>.
+| category    = [[Silicate minerals|Nesosilicates]]
+| 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]]
+| class       = Dipyramidal (mmm) <br/>[[H–M 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]] found in the [[volcanic]]ally ejected masses of [[Vesuvius]]. It was first described in 1813 and named for [[Sir Abraham Hume, 2nd Baronet|Abraham Hume]] (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>
-It was first described in 1813 and named for [[Abraham Hume]] (1749-1838).
-Humite is also used as the name of a group of closely related minerals -- humite, [[clinohumite]], [[chondrodite]], and [[norbergite]]. These minerals are similar in structure and in chemistry. Deer et al. (1997) note that a general formula for the humite-group minerals can be simply expressed as nM<sub>2</sub>SiO<sub>4</sub> . M(OH,F)<sub>2</sub> , where M is Mg, Fe, Ti etc. and n = 1 (norbergite), 2 (chondrodite), 3 (humite), and 4 (clinohumite). Deer et al. (1997) also note that although the formula above correctly describes the chemistries of these minerals, structural formulas are more complex.
 ==See also==
+{{Portal|Earth sciences}}
+* [[Alleghanyite]]
+* [[Chondrodite]]
+* [[Clinohumite]]
 * [[Jerrygibbsite]]
 ==References==
+{{reflist}}
-*Deer, W. A., Howie, R. A., and Zussman, J., 1997, ''Rock-forming minerals: Volume 1A, Second Edition, Orthosilicates.'' The Geological Society, Bath, UK. ISBN 1-897799-8-8
 ==External links==
+{{Commons category-inline}}
-*[http://webmineral.com/data/Humite.shtml Webmineral]
-*[http://www.mindat.org/min-1947.html Mindat w/ locations]
 [[Category:Magnesium minerals]]
-[[Category:Iron minerals]]
+[[Category:Iron(II) minerals]]
-[[Category:Hydroxide minerals]]
-[[Category:Nesosilicates]]
 [[Category:Gemstones]]
 [[Category:Humite group]]
+[[Category:Orthorhombic minerals]]
-{{mineral-stub}}
+[[Category:Minerals in space group 62]]
+{{silicate-mineral-stub}}
-[[fr:Humite]]
-[[hr:Humit]]
-[[it:Humite]]
-[[lt:Humitas]]
-[[nl:Humiet]]
-[[uk:Гуміт (вугілля)]]
-[[zh:矽鎂石]]