goethite
Definition
Noun: A red, yellow, or brown mineral; an oxide of iron that is a common constituent of rust. It is an iron oxyhydroxide with the chemical formula α-FeO(OH).
Usage
"Goethite" is a technical term used primarily in the fields of geology, mineralogy, and chemistry. It refers to a specific, naturally occurring mineral.
Examples
- Geologists identified the brown streaks in the rock as goethite.
- The presence of goethite is a key indicator of certain weathering processes.
- This sample of rust contains a mixture of hematite and goethite.
Advanced Usage
- In mineral classification: Goethite is an important ore mineral for iron, though less so than hematite or magnetite. It often forms through the weathering of other iron-bearing minerals.
- In pigment history: Historically, powdered goethite was used as a pigment, known as yellow ochre.
Variants and Related Words
- Limonite: A term often used for a mixture of various iron oxides and hydroxides, including goethite, that has a yellowish-brown color.
- Iron Oxyhydroxide: The broader chemical classification for goethite.
Synonyms
- Iron(III) oxide-hydroxide (chemical synonym)
Related Phrases
- Botryoidal goethite: Describing goethite that has formed in a rounded, grape-like cluster shape.
- Goethite pseudomorph: A specimen where goethite has replaced another mineral but retains the original mineral's crystal shape.
Noun
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a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust
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