Tokyoite
A variety of Minerals
What is Tokyoite?
Tokyoite is a rare barium manganese vanadate mineral with the chemical formula: Ba2(Mn,Fe)OH(VO4)2. It is the manganese analogue of the iron rich gamagarite and the barium analogue of the lead vanadate, brackebuschite. It occurs in low-grade metamorphosed sedimentary manganese ore deposits associated with hyalophane, braunite and tamaite. It was first reported for an occurrence in the Shiromaru Mine, Okutama, Tama district, Tokyo Prefecture, Kantō region, Honshu Island, Japan and approved by the IMA in 2003. It has been found in two mines in Italy and one in Japan, for which it was named.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Tokyoite 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.
Tokyoite Localities Map
See where Tokyoite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Red black
- Hardness (Mohs)
- 4.5 - 5
- Density
- 4.62 g/cm³
- Streak
- Deep brownish red
Chemical Properties
- Chemical Formula
- Ba2Mn3+(VO4)2(OH)
- Elements
- Ba, H, Mn, O, V
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Tokyoite FAQs
How do I identify Tokyoite?
Tokyoite can be identified by its hardness of 4.5 - 5 on the Mohs scale, Red black color. Look for these key characteristics when examining specimens.
What color is Tokyoite?
Tokyoite typically appears in Red black. Color can vary depending on impurities and formation conditions.
How hard is Tokyoite?
Tokyoite has a hardness of 4.5 - 5 on the Mohs scale. This gives it moderate hardness.
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