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Limonite

Limonite

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: October 2021
Limonite Rough
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Table of Contents
  • General Information
  • Limonite Colors
  • Alternate Names
  • Countries of Origin
  • History
  • Care

Limonite gets its name from the Greek words for “marshy lake” because it is found in marshes. Limonite is a mineraloid that contains varied amounts of goethite and hematite, forming from weathering of hematite, magnetite, and pyrite. It is often found as a pseudomorph as it replaces other minerals.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Limonite
Species
Limonite
Transparency
Opaque-Translucent
Hardness
4-5.5
Streak
Brown
Specific Gravity
2.700-4.300
Toughness
Poor
Luster
Dull, Adamantine, Vitreous
Stability
Brittle
Fracture
Conchoidal, Uneven, fibrous
Cleavage
Indeterminable
Chemical Name
Iron ore
Chemical Formula
FeO(OH)·nH2O
Crystal System
NA
Chemistry Classification
Mineraloid

Limonite Colors

  • Black Limonite
    Black
  • Brown Limonite
    Brown
  • Yellow Limonite
    Yellow

Alternate Names

bog iron, brown iron, brown hematite and brown ocher

Countries of Origin

Russian Federation; United States of America; Ukraine; India; Cuba; Unknown; Luxembourg; Congo (the Democratic Republic of the); Brazil; Italy; Australia; France; Germany

History

Limonite has been used as pigment since the Neolithic. It is still used today for yellow and brown pigments. There is evidence that Limonite has been mined for iron production since 2500 BCE and it used to be called “bog iron”. It is considered too impure for modern iron commercial mining.

Care

Limonite can be very soft. Please take care when handling. Soluble in hydrochloric acid.

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