Ironstone Concretion
A variety of Sedimentary
What is Ironstone Concretion?
Ironstone Concretion are rounded mineral formations found in sedimentary rock layers, primarily composed of iron compounds. Formed under specific chemical conditions, they accumulate around a nucleus like a leaf or bone. Often rusty-brown or reddish, these dense formations can range from small nodules to large boulders. They might resemble fossils externally and can even encase real fossils internally. Found globally in rocks like sandstones and shales, they intrigue rock collectors and can be used decoratively when polished.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Ironstone Concretion before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Ironstone Concretion Localities Map
See where Ironstone Concretion is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Brown, black, yellow, gray, red
- Density
- 2.5 - 3 g/cm³
Chemical Properties
- Chemical Formula
- n{Fe2+, 3+1-25O1-32} p{SiO2}
- Elements
- Fe, O, Si
Also Known As
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Ironstone Concretion FAQs
How do I identify Ironstone Concretion?
Ironstone Concretion can be identified by its Brown color. Look for these key characteristics when examining specimens.
What color is Ironstone Concretion?
Ironstone Concretion typically appears in Brown, black, yellow, gray, red. Color can vary depending on impurities and formation conditions.
