Gregoryite
A variety of Minerals
What is Gregoryite?
Gregoryite is an anhydrous carbonate mineral that is rich in potassium and sodium with the chemical formula (Na2,K2,Ca)CO3. It is one of the two main ingredients of natrocarbonatite, found naturally in the lava of Ol Doinyo Lengai volcano, the other being nyerereite. Because of its anhydrous nature, gregoryite reacts quickly with the environment, causing the dark lava to be converted to white substance within hours. Gregoryite was first described in 1980 and named after the British geologist and author John Walter Gregory (1864–1932), who studied the East African Rift Valley. It occurs associated with nyerereite, alabandite, halite, sylvite, fluorite and calcite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Gregoryite 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.
Gregoryite Localities Map
See where Gregoryite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Brown, milky white.
Chemical Properties
- Chemical Formula
- (Na2,K2,Ca)CO3
- Elements
- C, Ca, K, Na, O
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Gregoryite FAQs
How do I identify Gregoryite?
Gregoryite can be identified by its Brown color. Look for these key characteristics when examining specimens.
What color is Gregoryite?
Gregoryite typically appears in Brown, milky white.. Color can vary depending on impurities and formation conditions.
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