World Library  
Flag as Inappropriate
Email this Article
 

Babingtonite

Babingtonite
Triclinic crystals of babingtonite with prehnite, from Qiaojia, Qiaojia Co., Zhaotong, Yunnan, China (size: 71 mm x 55 mm, 71 g)
General
Category Inosilicate
Formula
(repeating unit)
Ca2(Fe,Mn)FeSi5O14(OH)
Strunz classification 09.DK.05
Identification
Color Dark green to black
Crystal habit Prismatic crystals
Crystal system Triclinic
Cleavage Perfect on {001}, Good on {010} and {100}
Fracture Irregular/uneven
Tenacity Brittle
Mohs scale hardness 5.5 to 6
Luster Vitreous
Diaphaneity Translucent on thin edges, opaque
Specific gravity 3.3
Refractive index nα= 1.700 nβ= 1.710 nγ= 1.725
Birefringence δ = 0.025
Pleochroism Visible
Dispersion r > v strong
References [1]

Babingtonite is a calcium iron manganese inosilicate mineral with the formula Ca2(Fe,Mn)FeSi5O14(OH). It is unusual in that iron(III) completely replaces the aluminium so typical of silicate minerals. It is a very dark green to black translucent (in thin crystals or splinters) mineral crystallizing in the triclinic system with typically radial short prismatic clusters and druzy coatings. It occurs with zeolite minerals in cavities in volcanic rocks. Babingtonite contains both iron(II) and iron(III) and shows weak magnetism. It has a Mohs hardness of 5.5 to 6 and a specific gravity of 3.3.

It was first described in 1824 from samples from Arendal, Aust-Agder, Norway (which is its type locality) and was named after the Irish physician and mineralogist William Babington (1757–1833).[2]

It is the official mineral (mineral emblem) of the Commonwealth of Massachusetts.[3]

References

  1. ^ http://www.mindat.org/min-478.html Babingtonite at Mindat.org
  2. ^ http://webmineral.com/data/Babingtonite.shtml Webmineral
  3. ^ Massachusetts: Mineral or mineral emblem of commonwealth
  • Mineral galleries
Babingtonite (dark) on Prehnite, Qiaojia, Qiaojia County, Yunnan Province, China . Crystal is 1.3 cm. high
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.