Share

WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Babingtonite
Babingtonite - Newington.jpg
General
Category Inosilicate
Formula
(repeating unit)
Ca2(Fe,Mn)FeSi5O14(OH)
Strunz classification 9.DK.05
Crystal system Triclinic
Crystal class Pinacoidal (1)
(same H-M symbol)
Space group P1
Identification
Color Dark green to black
Crystal habit Prismatic crystals
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][3]

It is the official mineral (mineral emblem) of the Commonwealth of Massachusetts.[4]

Image gallery[edit]

References[edit]

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

Powered by YouTube
Wikipedia content is licensed under the GFDL and (CC) license