Tangeite
A variety of Minerals
What is Tangeite?
Tangeite, also known as calciovolborthite, is a calcium, copper vanadate mineral with formula: CaCu(VO4)(OH). It occurs as a secondary mineral that can be found in sandstone and also in the oxidized zones of vanadium bearing deposits. It was named in 1925 by Aleksandr Evgenievich Fersman for its discovery locality in the Tange Gorge, Ferghana Valley, Alai Mountains, Kyrgyzstan.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Tangeite 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, yellow-green, olive green, green to dark green; light green in transmitted light.
- Hardness (Mohs)
- 3.5
- Rock tumbling
- Not recommended
- Density
- 3.84 g/cm³
- Streak
- light yellow green
Chemical Properties
- Chemical Formula
- CaCu(VO4)(OH)
- Elements
- Ca, Cu, H, O, V
Also Known As
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Tangeite FAQs
How do I identify Tangeite?
Tangeite can be identified by its hardness of 3.5 on the Mohs scale, yellow color. Look for these key characteristics when examining specimens.
What color is Tangeite?
Tangeite typically appears in yellow, yellow-green, olive green, green to dark green; light green in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Tangeite?
Tangeite has a hardness of 3.5 on the Mohs scale. This gives it moderate hardness.
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