Humite
(repeating unit)(Mg,Fe)7(SiO4)3(F,OH)2. IMA symbol Hu[1] 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 [2][3][4]
H–M Symbol: (2/m 2/m 2/m)
c = 4.73 [Å]; Z = 4
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]
See also
Earth sciences portal
- Alleghanyite
- Chondrodite
- Clinohumite
- Jerrygibbsite
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
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