Mineralogy Database

Schiavinatoite Mineral Data

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General Schiavinatoite Information

Help on Chemical  Formula: Chemical Formula: (Nb,Ta)BO4
Help on Composition: Composition: Molecular Weight = 209.97 gm
   Tantalum  41.36 %  Ta   50.51 % Ta2O5
   Niobium   23.01 %  Nb   32.91 % Nb2O5
   Boron      5.15 %  B    16.58 % B2O3
   Oxygen    30.48 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Nb0.52Ta0.48(BO4)
Help on Environment: Environment: In miarolitic cavities and intergranular mineral in a B-rich granitic pegmatite. Nb-analogue of behierite.
Help on IMA Status: IMA Status: Approved IMA 2001 (Dana # Added)
Help on Locality: Locality: Antsongombato, south of Betafo, Malagasy Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Italian mineralogist Giuseppe Schiavinato (1915-1996).
Help on Synonym: Synonym: IMA1999-051

Schiavinatoite Image

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Comments: Black, 3mm euhedral crystal of schiavinatoite in matrix.
Location: Ampanodiana Sud, Tetezantsio, Mahaiza, Madagascar. Scale: 3x2x2cm.
© Tom Loomis / Dakota Matrix

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  Schiavinatoite   Rynersonite

Comments: Brown, columnar schiavinatoite with minor white rynersonite sticks on quartz.
Location: Ampanodiana Sud, Tetezantsio, Mahaiza, Antananarivo, Madagascar. Scale: See Image.
© Jeff Weissman / Photographic Guide to Mineral Species

Schiavinatoite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.88229
Help on Cell Dimensions: Cell Dimensions: a = 6.219, c = 5.487, Z = 4; V = 212.22 Den(Calc)= 6.57
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/amd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.115(1)(101), 3.11(0.84)(200), 2.328(0.49)(112),1.598(0.42)(312), 2.481(0.36)(211), 1.939(0.29)(301),

Physical Properties of Schiavinatoite

Help on Cleavage: Cleavage: None
Help on Color: Color: Grayish pink.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 8 - Topaz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Schiavinatoite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1979,KC= 0.2001
Ncalc = 2.31
Help on Optical Data: Optical Data: Uniaxial (+), e=2.3.

Calculated Properties of Schiavinatoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.84 gm/cc
note: Specific Gravity of Schiavinatoite =6.57 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PESchiavinatoite = 515.65 barns/electron
U=PESchiavinatoite x rElectron Density=3,012.62 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schiavinatoite is Not Radioactive

Schiavinatoite Classification

Help on  Dana Class: Dana Class: (24)Borates - Anhydrous
  (24.01)where (A)2 XO4
  (24.01.02)Dana Group Behierite (Ta,Nb)BO4 I 41/amd 4/m 2/m 2/m Schiavinatoite! (Nb,Ta)BO4 I 41/amd 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 06.AC.15 06 - BORATES
  06.A - Monoborates
  06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.
06.AC.15 Behierite (Ta,Nb)BO4 I 41/amd 4/m 2/m 2/m
06.AC.15 Schiavinatoite! (Nb,Ta)BO4 I 41/amd 4/m 2/m 2/m

Other Schiavinatoite Information

Help on References: References: NAME( AmMin, Vol 86, p 1536) PHYS. PROP.(AmMin, Vol 86, p 1536) OPTIC PROP.(AmMin, Vol 86, p 1536)
Help on See Also: See Also: Links to other databases for Schiavinatoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 06.AC.15





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