Schiavinatoite
A valid IMA mineral species
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About Schiavinatoite
Giuseppe Schiavinato
Formula:
Nb(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 with which it forms a series.
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).
Possibly crystallochemically related to xenotime-(Y) (Ondrejka et al., 2022).
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).
Possibly crystallochemically related to xenotime-(Y) (Ondrejka et al., 2022).
Unique Identifiers
Mindat ID:
7110
Long-form identifier:
mindat:1:1:7110:5
IMA Classification of Schiavinatoite
Approved
IMA Formula:
Nb5+BO4
Approval year:
1999
First published:
2001
Classification of Schiavinatoite
6.AC.15
6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Shv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Schiavinatoite
Vitreous
Transparency:
Transparent
Colour:
Pink, greyish
Comment:
Colorless in thin section
Streak:
White
Hardness:
8 on Mohs scale
Cleavage:
None Observed
Density:
6.548 g/cm3 (Calculated)
Optical Data of Schiavinatoite
Type:
Uniaxial (+)
RI values:
nε = 2.3
Surface Relief:
Unknown
Chemistry of Schiavinatoite
Mindat Formula:
Nb(BO4)
Elements listed:
Crystallography of Schiavinatoite
Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/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
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006854 | Schiavinatoite | 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 | 2001 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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) |
Comments:
Very close to béhierite.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Schiavinatoite
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:
| B2O3 | 16.60 % |
|---|---|
| Nb2O5 | 33.08 % |
| Ta2O5 | 50.37 % |
| 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:
Synonyms of Schiavinatoite
Other Language Names for Schiavinatoite
Common Associates
Associations Based on Photo Data:
| 6 photos of Schiavinatoite associated with Béhierite | Ta(BO4) |
| 6 photos of Schiavinatoite associated with Rynersonite | CaTa2O6 |
| 5 photos of Schiavinatoite associated with Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| 4 photos of Schiavinatoite associated with Quartz | SiO2 |
| 3 photos of Schiavinatoite associated with Microcline | K(AlSi3O8) |
| 2 photos of Schiavinatoite associated with Albite | Na(AlSi3O8) |
| 2 photos of Schiavinatoite associated with 'Elbaite-Liddicoatite Series' | |
| 2 photos of Schiavinatoite associated with Danburite | CaB2Si2O8 |
| 2 photos of Schiavinatoite associated with 'Smoky Quartz' | SiO2 |
| 1 photo of Schiavinatoite associated with Londonite | CsBe4Al4(B11Be)O28 |
Related Minerals - Strunz-mindat Grouping
| 6.AC.05 | Sinhalite | MgAl(BO4) |
| 6.AC.10 | Pseudosinhalite | Mg2Al3(BO3)2(OH)O3 |
| 6.AC.15 | Béhierite | Ta(BO4) |
| 6.AC.20 | Frolovite | Ca[B(OH)4]2 |
| 6.AC.25 | Hexahydroborite | Ca[B(OH)4]2 · 2H2O or CaB2O4 · 6H2O |
| 6.AC.30 | Henmilite | Ca2Cu[B(OH)4]2(OH)4 |
| 6.AC.35 | Bandylite | Cu[B(OH)4]Cl |
| 6.AC.40 | Teepleite | Na2[B(OH)4]Cl |
| 6.AC.45 | Moydite-(Y) | Y[B(OH)4](CO3) |
| 6.AC.50 | Carboborite | Ca2Mg[B(OH)4]2(CO3)2 · 4H2O |
| 6.AC.55 | Sulfoborite | Mg3[B(OH)4]2(SO4)(OH,F)2 |
| 6.AC.60 | Lüneburgite | Mg3[B2(OH)6](PO4)2 · 6H2O |
| 6.AC.65 | Seamanite | Mn2+3[B(OH)4](PO4)(OH)2 |
| 6.AC.70 | Cahnite | Ca2[B(OH)4](AsO4) |
Fluorescence of Schiavinatoite
None fluoresecence under both short and long wave UV light.
Other Information
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.
Internet Links for Schiavinatoite
mindat.org URL:
https://www.mindat.org/min-7110.html
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References for Schiavinatoite
Reference List:
Heyns, A.M., Range, K.-J., Wildenauer, M. (1990) The vibrational spectra of NbBO4, TaBO4, NaNb3O8 and NaTa3O8. Spectrochimica Acta Part A: Molecular Spectroscopy, 46 (11). 1621-1628 doi:10.1016/0584-8539(90)80274-3
Demartin, Francesco; Diella, Valeria; Gramaccioli, Carlo M.; Pezzotta, Federico (2001) Schiavinatoite, (Nb,Ta)BO4, the Nb analogue of behierite. European Journal of Mineralogy, 13 (1). 159-165 doi:10.1127/0935-1221/01/0013-0159
Mandarino, Joseph A. (2001) New minerals. The Canadian Mineralogist, 39 (5) 1473-1502 doi:10.2113/gscanmin.39.5.1473
Pezzotta, Federico (2007) Ta-Nb borates and other rare accessory phases in granitic pegmatites of the Itremo region, central Madagascar. Norsk Bergverksmuseum Skrift, 35. 97-98
Chukanov, Nikita V. (2014) Infrared spectra of mineral species Vol. 1 - Springer Geochemistry/Mineralogy. Springer Netherlands. doi:10.1007/978-94-007-7128-4
Ondrejka, Martin, Molnárová, Alexandra, Putiš, Marián, Bačík, Peter, Uher, Pavel, Voleková, Bronislava, Milovská, Stanislava, Mikuš, Tomáš, Pukančík, Libor (2022) Hellandite-(Y)–hingganite-(Y)–fluorapatite retrograde coronae: a novel type of fluid-induced dissolution–reprecipitation breakdown of xenotime-(Y) in the metagranites of Fabova Hoľa, Western Carpathians, Slovakia. Mineralogical Magazine, 86 (4) 586-605 doi:10.1180/mgm.2022.7
Localities for Schiavinatoite
Showing 3 localities.
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Madagascar | |
| Chukanov (2014) |
| Pezzotta (2007) | |
| Demartin et al. (2001) +1 other reference |
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Antsongombato gem mine, Antsentsindrano, Anosiarivo Manapa, Betafo District, Vakinankaratra, Madagascar