Mindat Logo

Limonite

This page is currently not sponsored. Click here to sponsor this page.



Formula:
FeO(OH) · nH
 
2
O
Colour:Light brown to brown, ...Hardness:4 - 5½
Name:Named in 1813 by Johann Friedrich Ludwig Hausmann from the greek λειμωυ for meadow alluding to its common occurrences in bogs.


Currently used for unidentified massive hydroxides and oxides of iron, with no visible crystals, and a yellow-brown streak. 'Limonite' is most commonly the mineral species goethite, but can also consist of varying proportions of maghemite, hematite, lepidocrocite, hisingerite, pitticite, jarosite group species, etc.

Classification of Limonite

IMA status:Not Approved
Explanation of status:It is a generic term used for undifferentiated hydrated iron oxides - often hydrated goethite.
mindat.org URL:http://www.mindat.org/min-2402.html
Please feel free to link to this page.

Occurrences of Limonite

Geological Setting:A very common material in the oxidized zones of iron-bearing deposits, it is produced by the decomposition of many iron minerals, particularly pyrite, with water being retained in varying amounts.

Physical Properties of Limonite

Lustre:Earthy
Diaphaneity (Transparency):Opaque
Colour:Light brown to brown, may be yellowish-brown
Streak:Yellowish brown to red
Hardness (Mohs):4 - 5½
Comment:Massive may be very soft.
Density (measured):2.7 - 4.3 g/cm3

Crystallography of Limonite

Morphology:While "limonite" is amorphous, a number of minerals are noted for decomposing to it without losing their crystal shape - particularly pyrite crystals. Any "crystals" of "limonite" are actually pseudomorphs of other minerals which have decomposed in this fashion.

Chemical Properties of Limonite

Formula:
FeO(OH) · nH
 
2
O
Simplified for copy/paste:FeO(OH)·nH2O
Essential elements:Fe, H, O
All elements listed in formula:Fe, H, O
Analytical Data:While a "generic" formula is often given as stated here, "limonite" is really quite variable in composition - both in its levels of hydration and hydroxylation and in its cationic content. There really is no formual for it...

Other Names for Limonite

Synonyms:
Bog IronBog OreBrown HematiteBrown OcherBrown Umber
Eisenoxyd-HydratFerrite (of Vogelsang)FerrohydriteFerrum limosumGel-Goethite
HydroferriteHydrosideriteHyposideriteMarsh OreMeadow Ore
MinetteMorasterzOrtsteinPecheisensteinPerlimonite
RaseneisensteinSeeerzSumpferzUmberXanthosiderite (of Schmid)
Yellow Ochre
Other Languages:
Czech:Limonit
Estonian:Limoniit
French:Limonite
German:Limonit
Berggelb
Blauerz
Bohnerz
Brauneisen
Ferrohydrit
Gelbeisenstein
Glanzeisenstein
Hydrosiderit
Hyposiderit
Perlimonit
Toneisenerz
Toneisenstein
Hebrew:לימוניט
Japanese:褐鉄鉱
Lithuanian:Limonitas
Polish:Limonit
Portuguese:Limonite
Romanian:Limonit
Russian:Лимонит
Simplified Chinese:褐铁矿
黄针铁矿
Slovak:Limonit
Spanish:Limonita
Ferrohydrita
Globoso
Hierro arcilloso
Hydrosiderita
Hyposiderita
Palustre
Perlimonita
Swedish:Limonit
Gul Jernmalm
Myrmalm
Sjömalm
Traditional Chinese:褐鐵礦
黃針鐵礦
Varieties:
AdlersteinAlumolimoniteAuriferous LimoniteAvasiteBean Ore
Chromiferous LimoniteLiminitogeliteLimniteStilpnosiderite

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Limonite

Reference List:

- +
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume I: 685-686.

Mindat.org articles about Limonite

Article entries:
Oregon's First Iron SmelterBill Tompkins

Internet Links for Limonite

Search Engines:
  • Look for Limonite on Google
  • Look for Limonite images on Google
  • Mineral Dealers:
  • Fine Minerals from Weinrich Minerals, Inc.
  • Buy minerals from YourMineralCollection
  • Wilensky Fine Minerals
  • Fine minerals from bisbeeborn.com
  • Fine and rare minerals from mintreasure.com
  • Buy fine minerals and gemstones from Pala International
  • The Arkenstone - Fine Minerals
  • Buy rare minerals from Excalibur Minerals
  • Buy from David K Joyce minerals
  • Top quality minerals from Kristalle of California
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Find Limonite on www.crystalclassics.co.uk
  • Specimens:The following Limonite specimens are currently listed for sale on minfind.com.

    Localities for Limonite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Mineral and/or Locality  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: December 23, 2014 00:37:24
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds