Babingtonite

Babingtonite

Infobox mineral
name = Babingtonite
category =
boxwidth =
boxbgcolor =


imagesize =
caption = Babingtonite from Baveno, Piemonte, Italy
formula = Ca2(Fe,Mn)FeSi5O14(OH)
molweight =
color = Dark green to black
habit = Prismatic crystals
system = Triclinic
twinning =
cleavage = Perfect on {001}, Good on {010} and {100}
fracture = Irregular/uneven
tenacity = Brittle
mohs = 5.5 to 6
luster = Vitreous
polish =
refractive = nα= 1.700 nβ= 1.710 nγ= 1.725
opticalprop =
birefringence = δ = 0.025
dispersion = r > v strong
pleochroism = Visible
fluorescence=
absorption =
streak =
gravity = 3.3
density =
melt =
fusibility =
diagnostic =
solubility =
diaphaneity = Translucent on thin edges, opaque
other =
references = [http://www.mindat.org/min-478.html Babingtonite at Mindat.org]

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).

It is the official mineral (mineral emblem) of the Commonwealth of Massachusetts. [ [http://www.mass.gov/legis/laws/mgl/2-18.htm General Laws of Massachusetts, Part I. Administration of the Government, Title I. Jurisdiction and Emblems of the Commonwealth, The General Court, Statutes and Public Documents, Chapter 2. Arms, Great Seal and other Emblems of the Commonwealth, Chapter 2: Section 18. Mineral or mineral emblem of commonwealth] ]

References

* [http://www.mindat.org/min-478.html Mindat with location data]
* [http://webmineral.com/data/Babingtonite.shtml Webmineral]
* [http://mineral.galleries.com/minerals/silicate/babingto/babingto.htm Mineral galleries]


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Look at other dictionaries:

  • Babingtonite — Babingtonite[1] Catégorie IX : silicates[2] …   Wikipédia en Français

  • Babingtonite — Bab ing*ton*ite, n. [From Dr. Babbington.] (Min.) A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color. It is a silicate of iron, manganese, and lime. [1913 Webster] || …   The Collaborative International Dictionary of English

  • babingtonite — ˈbabiŋtəˌnīt noun ( s) Etymology: William Babington died 1833 English mineralogist + English ite : a greenish black mineral Ca2(Fe,Mn)Si5O14OH consisting of a silicate of iron and calcium occurring in triclinic crystals (hardness 5.5 6) * * *… …   Useful english dictionary

  • babingtonite — noun A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color. It is a silicate of iron, manganese, and lime. <!SOED …   Wiktionary

  • babingtonite — bab·ing·ton·ite …   English syllables

  • Бабингтонит — Формула Ca2(Fe,Mn)FeSi5O …   Википедия

  • Arendal — Infobox Kommune name = Arendal idnumber = 0906 county = Aust Agder landscape = Sørlandet capital = Arendal demonym = Arendalitt language = Bokmål munwebpage = www.arendal.kommune.no governor = Torill Rolstad Larsen (Ap) governor as of = 2003… …   Wikipedia

  • William Babington (physician) — William Babington FRS (May 21, 1756 ndash; April 29, 1833) was a British physician and mineralogist. Life and work Babington was physician to Guy s Hospital from 1795 to 1811. He was president of the Geological Society of London from 1822 to 1824 …   Wikipedia

  • List of minerals A-B (complete) — It is currently not possible to have a complete list of minerals . The International Mineralogical Association is the international group that recognises new minerals and new mineral names, however minerals discovered before 1959 did not go… …   Wikipedia

  • Julgoldite — Infobox mineral name = Julgoldite category = Silicate mineral boxwidth = boxbgcolor = imagesize = caption = formula = (Ca,Mn)2(Fe2+,Fe3+,Mg)(Fe3+,Al)2(SiO4)(Si2O7)(OH)2(H2O) molweight = color = Black to greenish olive habit = blades or prisms.… …   Wikipedia

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