Where is Iron-rich Sandstone found?
Sedimentary rock, likely ferruginous sandstone
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Open the appIron-rich Sandstone 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 Iron-rich Sandstone
Colorado Plateau, USA
Extensive formations like the Navajo Sandstone and Entrada Sandstone exhibit significant iron staining, particularly in areas like Zion National Park and Arches National Park, giving them their characteristic red and orange colors.
Western Australia
The Hamersley Basin contains vast deposits of banded iron formations (BIFs) and associated iron-rich sedimentary rocks, though these are often more iron-rich than typical ferruginous sandstone.
Nubian Sandstone Aquifer System, North Africa
Large areas of iron-stained sandstones are found across Egypt, Sudan, Libya, and Chad, forming significant aquifer systems.
Devonian Old Red Sandstone, UK
Widespread in parts of Scotland, Wales, and England, these sandstones are often rich in hematite, giving them a distinctive red color.
Collecting tips
- Look for Reddish Hues. The most obvious indicator is the characteristic red, orange, or brown coloration. This color is often more pronounced on weathered surfaces.
- Examine Grain Size and Texture. Confirm it's a sandstone by observing sand-sized grains. The iron cement may make the rock feel denser and harder than typical quartz sandstone.
- Check for Iron Staining. Iron oxides can sometimes be seen as a coating on individual grains or as a pervasive cement. A streak test (on an unglazed porcelain plate) might yield a reddish-brown streak if hematite is abundant.
- Consider the Geological Context. Look for it in sedimentary sequences, particularly those deposited in oxidizing environments or near sources of iron-rich minerals.
Quick Check
- Color:
- Reddish-brown, orange, yellow, purplish
- Luster:
- Dull to earthy
- Streak:
- Reddish-brown (if hematite is dominant), yellowish-brown (if goethite/limonite is dominant), or white (if iron content is low and quartz dominates the streak)
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