Diadochite
A variety of Minerals
What is Diadochite?
Diadochite is a phospho-sulfate mineral. It is a secondary mineral formed by the weathering and hydration of other minerals. Its formula is Fe2(PO4)(SO4)OH·5H2O. Well crystallized forms are referred to as destinezite, which has been given official recognition by the International Mineralogical Association with diadochite being the poorly formed to amorphous variety. It has a greenish yellow to brown colour and forms nodules or crusts. Its appearance has been compared to cauliflower. Identified originally in Belgium in 1831, it has been found in many places throughout the world. It occurs as a secondary mineral in mineral gossans, coal deposits, phosphate rich pegmatites and cave guano deposits.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Diadochite 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.
Quick Facts
Physical Properties
- Color
- Yellow to greenish-yellow or brown, reddish brown, light green, light yellow; pale yellow to yellowish brown in transmitted light.
- Hardness (Mohs)
- 3 - 4
- Rock tumbling
- Not recommended
- Density
- 2.32 g/cm³
- Streak
- Yellow to yellow-brown
Chemical Properties
- Chemical Formula
- Fe3+2(PO4)(SO4)(OH) · 5H2O
- Elements
- Fe, H, O, P, S
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Diadochite FAQs
How do I identify Diadochite?
Diadochite can be identified by its hardness of 3 - 4 on the Mohs scale, Yellow to greenish-yellow or brown color. Look for these key characteristics when examining specimens.
What color is Diadochite?
Diadochite typically appears in Yellow to greenish-yellow or brown, reddish brown, light green, light yellow; pale yellow to yellowish brown in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Diadochite?
Diadochite has a hardness of 3 - 4 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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