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Schiavinatoite

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Ampanodiana South pegmatite, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa Commune, Betafo District, Vakinankaratra Region, Antananarivo Province, Madagascar
© fabreminerals.com

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Formula:
(Nb,Ta)(BO
 
4
)
System:TetragonalColour:Pink, greyish
Lustre:VitreousHardness:8
Name:For Guiseppe Schiavinato (1915-96).


The niobium analogue of Behierite.

Classification of Schiavinatoite

IMA status:Approved 1999
Nickel-Strunz 10th (pending) edition ID:6.AC.15

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
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Type Occurrence of Schiavinatoite

Type Locality:Antsongombato gem mine, FKT Antsentsindrano, Andrembesoa Commune, Betafo District, Vakinankaratra Region, Antananarivo Province, Madagascar

Physical Properties of Schiavinatoite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Pink, greyish
Streak:White
Hardness (Mohs):8

Crystallography of Schiavinatoite

Crystal System:Tetragonal

Optical Data of Schiavinatoite

Type:Uniaxial (+)
RI values: nε = 2.300
Maximum Birefringence:δ = 0.000

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Schiavinatoite

Formula:
(Nb,Ta)(BO
 
4
)
Essential elements:B, Nb, O
All elements listed in formula:B, Nb, O, Ta

Relationship of Schiavinatoite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.AC.05Sinhalite
MgAl(BO
 
4
)
6.AC.10Pseudosinhalite
Mg
 
2
Al
 
3
(BO
 
3
)
 
2
(OH)O
 
3
6.AC.15Behierite
(Ta
5+
 
,Nb
5+
 
)(BO
 
4
)
6.AC.20Frolovite
Ca[B(OH)
 
4
]
 
2
6.AC.25Hexahydroborite
Ca[B(OH)
 
4
]
 
2
 · 6H
 
2
O
6.AC.30Henmilite
Ca
 
2
Cu[B(OH)
 
4
]
 
2
(OH)
 
4
6.AC.35Bandylite
Cu[B(OH)
 
4
]Cl
6.AC.40Teepleite
Na
 
2
[B(OH)
 
4
]Cl
6.AC.45Moydite-(Y)
Y[B(OH)
 
4
](CO
 
3
)
6.AC.50Carboborite
Ca
 
2
Mg[B(OH)
 
4
]
 
2
(CO
 
3
)
 
2
 · 4H
 
2
O
6.AC.55Sulfoborite
Mg
 
3
[B(OH)
 
4
]
 
2
(SO
 
4
)(OH,F)
 
2
6.AC.60Lüneburgite
Mg
 
3
[B
 
2
(OH)
 
6
](PO
 
4
)
 
2
 · 6H
 
2
O
6.AC.65Seamanite
Mn
2+
3
[B(OH)
 
4
](PO
 
4
)(OH)
 
2
6.AC.70Cahnite
Ca
 
2
[B(OH)
 
4
](AsO
 
4
)

Other Names for Schiavinatoite

Synonyms:
IMA1999-051
Other Languages:
German:Schiavinatoit
Russian:Скиавинатоит
Spanish:Schiavinatoita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Schiavinatoite

Reference List:

- +
Gramaccioli, Carlo Maria (2000) - Un nuovo minerale: la Schiavinatoite - Rend. Fis. Acc. Lincei, s. 9, v. 11 (2000) 4, pp. 197 - 199.

European Journal of Mineralogy (2001): 13: 159-165.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Schiavinatoite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Schiavinatoite details from Handbook of Mineralogy (PDF)
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    • Localities for Schiavinatoite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Madagascar
     
    • Antananarivo Province
      • Vakinankaratra Region
        • Betafo District
          • Andrembesoa Commune
            • FKT Antsentsindrano
    		Demartin, F. et al (2001): Schiavinatoite,(Nb,Ta)BO4, the Nb analogue of behierite. European Journal of Mineralogy 13, 159-165
            • Tetezantsio-Andoabatokely Pegmatite Field
    		Pezzotta, Federico (2007): Ta-Nb borates and other rare accessory phases in granitic pegmatites of the Itremo region, central Madagascar. Bergverksmuseet Skrift 35,97-98
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