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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Inline

Revision as of 10:03, 10 February 2022

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]

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.
^ 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.

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@@ Line 6: / Line 6: @@
 | 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|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|journal=Mineralogical Magazine|volume=85|pages=291–320}}</ref>
 | strunz      = 9.AF.50
 | system      = [[Orthorhombic]]