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About SchiavinatoiteHide

Giuseppe Schiavinato
Pink, greyish
Specific Gravity:
6.548 (Calculated)
Crystal System:
For the Italian mineralogist, Giuseppe Schiavinato (Padua 10 December 1915 - Milano 25 June 1996), who supported the advancement of mineralogy in Italy.
The niobium analogue of béhierite. Forms a series with béhierite. Second mineral with essential Nb and B after nioboholtite.
Occurs intimately associated with Nb-rich béhierite, as portions in bipyramidal crystals.

Béhierite-schiavinatoite crystals may have a black encrusting of rynersonite. The crystals may be partially altered into microlite group or rynersonite (or vigezzite) (Pezzotta 2007).

Classification of SchiavinatoiteHide

Approval Year:
First Published:

A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc

Physical Properties of SchiavinatoiteHide

Pink, greyish
Colorless in thin section
None Observed
6.548 g/cm3 (Calculated)

Optical Data of SchiavinatoiteHide

Uniaxial (+)
RI values:
nε = 2.300
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of SchiavinatoiteHide

IMA Formula:

Crystallography of SchiavinatoiteHide

Crystal System:
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
Cell Parameters:
a = 6.219(5) Å, c = 5.487(5) Å
a:c = 1 : 0.882
Unit Cell V:
212.21 ų (Calculated from Unit Cell)
As portions in behierite crystals. Forms observed on the crystal: tetragonal bipyramid, a tetragonal prism.
None observed

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006854SchiavinatoiteDemartin F, Diella V, Gramaccioli C M, Pezzotta F (2001) Schiavinatoite, (Nb,Ta)BO4, the Nb analogue of behierite European Journal of Mineralogy 13 159-16520010293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
4.115 Å(100)
3.110 Å(84)
2.481 Å(36)
2.328 Å(49)
1.939 Å(29)
1.646 Å(25)
1.598 Å(42)
Very close to béhierite.

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of SchiavinatoiteHide

General Appearance of Type Material:
As a small portion of a greyish pink well-formed flattened bipyramidal Nb-rich behierite crystal (4mm large)
Place of Conservation of Type Material:
Collection of the Museo Civico di Storia Naturale, Milane, Italy. MSNM M31137.
Empirical Formula of Type Material:
(Nb0.52Ta0.48 ) Σ1.00BO4
Chemical Analysis of Type Material:
B2O316.60 %
Nb2O533.08 %
Ta2O550.37 %
Total:100.05 %
Geological Setting of Type Material:
In the highly evolved portion of a LCT granite pegmatite dyke of danburite subtype.
Associated Minerals at Type Locality:
Demartin, F., Diella, V., Gramaccioli, C. M., Pezzotta, F. (2001) Schiavinatoite, (Nb,Ta)BO4, the Nb analogue of behierite. European Journal of Mineralogy: 13: 159-165.

Synonyms of SchiavinatoiteHide

Other Language Names for SchiavinatoiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Schiavinatoite associated with RynersoniteCaTa2O6
2 photos of Schiavinatoite associated with QuartzSiO2
1 photo of Schiavinatoite associated with TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
1 photo of Schiavinatoite associated with ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
1 photo of Schiavinatoite associated with DanburiteCaB2Si2O8
1 photo of Schiavinatoite associated with Smoky QuartzSiO2
1 photo of Schiavinatoite associated with Londonite(Cs,K,Rb)Al4Be4(B,Be)12O28

Related Minerals - Nickel-Strunz GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
6.AC.35BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.40TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)Orth. mmm (2/m 2/m 2/m) : Pbca
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2OMon.
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
6.AC.65SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)
6.AC.70CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4

Fluorescence of SchiavinatoiteHide

None fluoresecence under both short and long wave UV light.

Other InformationHide

IR Spectrum:
Ampanodiana North pegmatite material [cm-1]: 3260w, 1062s, 920sh, 865s, 581, 504s, 470sh
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for SchiavinatoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Gramaccioli, C.M. (2000) Un nuovo minerale: la Schiavinatoite - Rend. Fis. Acc. Lincei, s. 9: 11(4): 197-199.
Demartin, F., Diella, V., Gramaccioli, C. M., Pezzotta, F. (2001) Schiavinatoite, (Nb,Ta)BO4, the Nb analogue of behierite. European Journal of Mineralogy: 13: 159-165.
Jambor, J.L., Roberts, A.C. (2001) New mineral names. American Mineralogist: 86: 1534-1537.
Mandarino, J.A. (2001) New minerals. The Canadian Mineralogist: 39: 1473-1502.
Grew, E.S., Anovitz, L.M. (2002) BORON: Mineralogy, Petrology and Geochemistry, second edition.
Pezzotta, F. (2007): Ta-Nb borates and other rare accessory phases in granitic pegmatites of the Itremo region, central Madagascar. Bergverksmuseet Skrift. 35: 97-98
Chukanov, N.V. (2014) Infrared spectra of mineral species: Extended library. Springer (Springer Geochemistry/Mineralogy), vol. 1, Dordrecht, 1726 pp.

Internet Links for SchiavinatoiteHide

Localities for SchiavinatoiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Vakinankaratra
    • Betafo
      • Andrembesoa
        • Tetezantsio-Andoabatokely Pegmatite Field
Chukanov, N.V. (2014): Infrared spectra of mineral species: Extended library. Springer (Springer Geochemistry/Mineralogy), vol. 1, Dordrecht, 1726 pp.
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
      • Anosiarivo Manapa
        • Antsentsindrano
Demartin, F. et al (2001): Schiavinatoite,(Nb,Ta)BO4, the Nb analogue of behierite. European Journal of Mineralogy 13, 159-165
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