Manganoneptunite
A variety of Minerals
What is Manganoneptunite?
Neptunite is a silicate mineral with the formula KNa2Li(Fe, Mn)2Ti2Si8O24. With increasing manganese it forms a series with mangan-neptunite. Watatsumiite is the variety with vanadium replacing the titanium in the formula. It was first described in 1893 for an occurrence in the Narssârssuk pegmatite of West Greenland. It is also found within natrolite veins in glaucophane schist within serpentinite in San Benito County, California, US. It also occurs in Mont Saint-Hilaire, Quebec and in the Kola Peninsula of Russia. The mineral is named for Neptune, Roman god of the sea because of its association with aegirine from Àgir, the Scandinavian sea-god. The Gemological Institute of America (GIA) identified an 11.78-carat faceted specimen as neptunite based on Raman spectroscopy.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Manganoneptunite 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.
Manganoneptunite Localities Map
See where Manganoneptunite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Red
- Hardness (Mohs)
- 5 - 6
Chemical Properties
- Chemical Formula
- Na2KLiMn2+2Ti2Si8O24
- Elements
- K, Li, Mn, Na, O, Si, Ti
Also Known As
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Manganoneptunite FAQs
How do I identify Manganoneptunite?
Manganoneptunite can be identified by its hardness of 5 - 6 on the Mohs scale, Red color. Look for these key characteristics when examining specimens.
What color is Manganoneptunite?
Manganoneptunite typically appears in Red. Color can vary depending on impurities and formation conditions.
How hard is Manganoneptunite?
Manganoneptunite has a hardness of 5 - 6 on the Mohs scale. This gives it moderate hardness.
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