Tapiolite-(fe)
Tapiolite-(Fe)
A variety of Minerals
What is Tapiolite-(fe)?
Tapiolite [(Fe, Mn)(Nb, Ta)2O6] is a black mineral series that is an ore of niobium and tantalum. The tapiolite group includes tapiolite-(Fe) or ferrotapiolite and tapiolite-(Mn) or manganotapiolite. Tapiolite-(Fe) is by far the more common of the two. The minerals have a submetallic luster and a high specific gravity with tapiolite-Fe having a higher specific gravity (7.90) versus 7.72 for tapiolite-Mn. The mineral was named in 1863 after the forest god Tapio of Finnish mythology, and the original tapiolite material came from Sukula, Tammela, Tavastia Proper, Finland. Tapiolite is very close to columbite and tantalite. Those minerals have the same chemical composition, but different crystal symmetry orthorhombic for tantalite or columbite and tetragonal for tapiolite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Tapiolite-(fe) 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.
Tapiolite-(fe) Localities Map
See where Tapiolite-(fe) is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Black
- Hardness (Mohs)
- 6 - 6.5
- Density
- 8.17 g/cm³
- Streak
- Brownish black
Chemical Properties
- Chemical Formula
- Fe2+Ta2O6
- Elements
- Fe, O, Ta
Also Known As
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Tapiolite-(fe) FAQs
How do I identify Tapiolite-(fe)?
Tapiolite-(fe) can be identified by its hardness of 6 - 6.5 on the Mohs scale, Black color. Look for these key characteristics when examining specimens.
What color is Tapiolite-(fe)?
Tapiolite-(fe) typically appears in Black. Color can vary depending on impurities and formation conditions.
How hard is Tapiolite-(fe)?
Tapiolite-(fe) has a hardness of 6 - 6.5 on the Mohs scale. This gives it moderate hardness.
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