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Schiavinatoite

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About SchiavinatoiteHide

Giuseppe Schiavinato
Formula:
(Nb,Ta)(BO4)
Colour:
Pink, greyish
Lustre:
Vitreous
Hardness:
8
Specific Gravity:
6.548 (Calculated)
Crystal System:
Tetragonal
Name:
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

Approved
Approval Year:
1999
First Published:
2001
6.AC.15

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

Physical Properties of SchiavinatoiteHide

Vitreous
Transparency:
Transparent
Colour:
Pink, greyish
Comment:
Colorless in thin section
Streak:
White
Hardness:
Cleavage:
None Observed
Density:
6.548 g/cm3 (Calculated)

Optical Data of SchiavinatoiteHide

Type:
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:
Moderate

Chemical Properties of SchiavinatoiteHide

Formula:
(Nb,Ta)(BO4)
IMA Formula:
Nb(BO4)

Crystallography of SchiavinatoiteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I41/amd
Cell Parameters:
a = 6.219(5) Å, c = 5.487(5) Å
Ratio:
a:c = 1 : 0.882
Unit Cell V:
212.21 ų (Calculated from Unit Cell)
Z:
4
Morphology:
As portions in behierite crystals. Forms observed on the crystal: tetragonal bipyramid, a tetragonal prism.
Twinning:
None observed

X-Ray Powder DiffractionHide

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

Occurrences of SchiavinatoiteHide

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:
Reference:
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:
Rynersonite4 photos of Schiavinatoite associated with Rynersonite on mindat.org.
Quartz2 photos of Schiavinatoite associated with Quartz on mindat.org.
Tourmaline1 photo of Schiavinatoite associated with Tourmaline on mindat.org.
Elbaite1 photo of Schiavinatoite associated with Elbaite on mindat.org.
Danburite1 photo of Schiavinatoite associated with Danburite on mindat.org.
Smoky Quartz1 photo of Schiavinatoite associated with Smoky Quartz on mindat.org.
Londonite1 photo of Schiavinatoite associated with Londonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3Mon.
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.20FroloviteCa[B(OH)4]2Tric.
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4Tric.
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.
Madagascar
 
  • Antananarivo Province
    • Vakinankaratra Region
      • Betafo District
        • Andrembesoa Commune
          • 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 Commune
          • Antsentsindrano
Demartin, F. et al (2001): Schiavinatoite,(Nb,Ta)BO4, the Nb analogue of behierite. European Journal of Mineralogy 13, 159-165
Mineral and/or Locality  
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