Stibiotantalite
A variety of Minerals
What is Stibiotantalite?
Stibiotantalite is a mineral consisting of Sb(Ta,Nb)O4 (antimony, tantalum or niobium, and oxygen). It is found in complex granite pegmatites. If the quantity of niobium exceeds the tantalum content, the mineral is called stibiocolumbite. It is translucent to transparent, medium hard (5.5 mohs), appears yellow to dark brown, reddish or greenish brown, with an adamantine luster. Stibiotantalite is found in veins and walls associated with tin mines. It is a fairly rare to rare mineral. Due to its relative softness, it is more likely to be found in mineral collections than in jewelry.
Optical Properties
- Refractive Index
- 2.37-2.45
- Birefringence
- 0.08
- Optical Character
- Biaxial positive
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Stibiotantalite 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.
Stibiotantalite Localities Map
See where Stibiotantalite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Yellow to dark brown, reddish or greenish brown
- Hardness (Mohs)
- 5.5
- Density
- 7.58 g/cm³
- Streak
- Light yellow, yellow-brown
Chemical Properties
- Chemical Formula
- Sb(Ta,Nb)O4
- Elements
- O, Sb, Ta
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Stibiotantalite FAQs
How do I identify Stibiotantalite?
Stibiotantalite can be identified by its hardness of 5.5 on the Mohs scale, Yellow to dark brown color. Look for these key characteristics when examining specimens.
What color is Stibiotantalite?
Stibiotantalite typically appears in Yellow to dark brown, reddish or greenish brown. Color can vary depending on impurities and formation conditions.
How hard is Stibiotantalite?
Stibiotantalite has a hardness of 5.5 on the Mohs scale. This gives it moderate hardness.
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