Schiavinatoite
A variety of Minerals
What is Schiavinatoite?
Schiavinatoite is a very rare mineral, a natural niobium borate of the formula (Nb,Ta)BO4. Schiavinatoite is classified as monoborate. It contains tetrahedral borate anion instead of planar BO3 group, which is more common among minerals. Schiavinatoite is one of the most simple niobium minerals. It forms a solid solution with its tantalum-analogue, béhierite. Both minerals possess zircon-type structure (tetragonal, space group I41/amd) and occur in pegmatites. Schiavinatoite and nioboholtite are minerals with essential niobium and boron.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Schiavinatoite 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.
Schiavinatoite Localities Map
See where Schiavinatoite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Schiavinatoite
Schiavinatoite was detected in miaroles of a pegmatite at Antsongombato, Madagascar. It coexists with an apatite-group mineral, béhierite, danburite, elbaite–liddicoatite, feldspar, pollucite, quartz, rhodizite, and spodumene.
Composition of Schiavinatoite
The main facts about schiavinatoite's structure: isostructural with zircon niobium coordination number of 8 (coordination polyhedron is distorted triangular dodecahedron) tetrahedrally-coordinated boron chains of edge-sharing BO4 and NbO8 polyhedra, parallel to [001] edge-sharing dodecahedra link the chains
Quick Facts
Physical Properties
- Color
- Pink, greyish
- Hardness (Mohs)
- 8
- Density
- 6.548 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- (Nb,Ta)(BO4)
- Elements
- B, Nb, O, Ta
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Schiavinatoite FAQs
How do I identify Schiavinatoite?
Schiavinatoite can be identified by its hardness of 8 on the Mohs scale, Pink color. Look for these key characteristics when examining specimens.
What color is Schiavinatoite?
Schiavinatoite typically appears in Pink, greyish. Color can vary depending on impurities and formation conditions.
How hard is Schiavinatoite?
Schiavinatoite has a hardness of 8 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.
What is the formation of schiavinatoite of Schiavinatoite?
Schiavinatoite was detected in miaroles of a pegmatite at Antsongombato, Madagascar. It coexists with an apatite-group mineral, béhierite, danburite, elbaite–liddicoatite, feldspar, pollucite, quartz, rhodizite, and spodumene.
What is the composition of schiavinatoite of Schiavinatoite?
The main facts about schiavinatoite's structure: isostructural with zircon niobium coordination number of 8 (coordination polyhedron is distorted triangular dodecahedron) tetrahedrally-coordinated boron chains of edge-sharing BO4 and NbO8 polyhedra, parallel to [001] edge-sharing dodecahedra link the chains
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