Magadiite
A variety of Minerals
What is Magadiite?
Magadiite is a hydrous sodium silicate mineral (NaSi7O13(OH)3·4(H2O)) which precipitates from alkali brines as an evaporite phase. It forms as soft (Mohs hardness of 2) white powdery monoclinic crystal masses. The mineral is unstable and decomposes during diagenesis leaving a distinctive variety of chert (Magadi-type chert). The mineral was first described by Hans P. Eugster in 1967 for an occurrence in Lake Magadi, Kenya, and is also found at Olduvai Gorge, Tanzania. It is also reported from alkalic intrusive syenites as in Mont Saint-Hilaire, Canada.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Magadiite 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.
Magadiite Localities Map
See where Magadiite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Hardness (Mohs)
- 2
Chemical Properties
- Chemical Formula
- Na2Si14O29 · 11H2O
- Elements
- H, Na, O, Si
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Magadiite FAQs
How do I identify Magadiite?
Magadiite can be identified by its hardness of 2 on the Mohs scale. Look for these key characteristics when examining specimens.
How hard is Magadiite?
Magadiite has a hardness of 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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