Where is Orthoclase with Limonite found?
KAlSi3O8 with FeO(OH)·nH2O
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Open the appOrthoclase with Limonite occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Orthoclase with Limonite
Worldwide in granitic and pegmatitic terrains
Orthoclase is a major constituent of felsic igneous rocks and pegmatites, which are found globally. Limonite staining can occur wherever these rocks are exposed to weathering.
Hydrothermal alteration zones
Areas where hot, iron-rich fluids have circulated through rocks containing orthoclase can lead to limonite deposition.
Sedimentary environments
Orthoclase grains in arkosic sandstones or other sediments can be stained by limonite during diagenesis or weathering.
Collecting tips
- Look for weathered outcrops. Limonite is a product of weathering, so examine exposed rock faces, stream beds, and road cuts in areas known for granitic or pegmatitic intrusions.
- Observe color variations. The characteristic yellow, brown, or reddish-brown staining will be the primary indicator of limonite on orthoclase.
- Check for cleavage. Even with limonite staining, the underlying orthoclase will retain its characteristic two cleavages at 90 degrees, which can be observed on fresh breaks.
Quick Check
- Color:
- Orthoclase: white, pink, salmon-orange, gray. Limonite: yellow, brown, reddish-brown, ochre (as a coating/stain).
- Luster:
- Orthoclase: vitreous to pearly. Limonite: dull, earthy, sometimes sub-metallic.
- Streak:
- Orthoclase: white. Limonite: yellowish-brown to brownish-red.
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