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![Mineralogy Database Mineralogy Database](/images/Hedyphane_Crystal.gif) |
Schiavinatoite Mineral Data
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General Schiavinatoite Information
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Chemical Formula: |
(Nb,Ta)BO4 |
Composition: |
Molecular Weight = 209.97 gm |
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Tantalum 41.36 % Ta 50.51 % Ta2O5 |
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Niobium 23.01 % Nb 32.91 % Nb2O5 |
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Boron 5.15 % B 16.58 % B2O3 |
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Oxygen 30.48 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Nb0.52Ta0.48(BO4) |
Environment: |
In miarolitic cavities and intergranular mineral in a B-rich granitic pegmatite. Nb-analogue of behierite. |
IMA Status: |
Approved IMA 2001 (Dana # Added) |
Locality: |
Antsongombato, south of Betafo, Malagasy Republic. Link to MinDat.org Location Data. |
Name Origin: |
Named for Italian mineralogist Giuseppe Schiavinato (1915-1996). |
Synonym: |
IMA1999-051 |
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Schiavinatoite Image |
Images:
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Images:
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Schiavinatoite Crystallography
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Axial Ratios: |
a:c = 1:0.88229 |
Cell Dimensions: |
a = 6.219, c = 5.487, Z = 4; V = 212.22 Den(Calc)= 6.57 |
Crystal System: |
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/amd |
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), |
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Physical Properties of Schiavinatoite
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Cleavage: |
None |
Color: |
Grayish pink. |
Diaphaneity: |
Transparent |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Hardness: |
8 - Topaz |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Schiavinatoite
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Gladstone-Dale: |
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1979,KC= 0.2001 Ncalc = 2.31 |
Optical Data: |
Uniaxial (+), e=2.3. |
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Calculated Properties of Schiavinatoite
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Electron Density: |
Bulk Density (Electron Density)=5.84 gm/cc note: Specific Gravity of Schiavinatoite =6.57 gm/cc. |
Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
Photoelectric: |
PESchiavinatoite = 515.65 barns/electron U=PESchiavinatoite x rElectron Density=3,012.62 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Schiavinatoite is Not Radioactive |
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Schiavinatoite Classification
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Dana Class: |
24.01.02.02 (24)Borates - Anhydrous |
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(24.01)where (A)2 XO4 |
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(24.01.02)Dana Group |
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24.01.02.01 Behierite (Ta,Nb)BO4 I 41/amd 4/m 2/m 2/m |
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24.01.02.02 Schiavinatoite! (Nb,Ta)BO4 I 41/amd 4/m 2/m 2/m |
Strunz Class: |
06.AC.15 06 - BORATES |
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06.A - Monoborates |
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06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc. |
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06.AC.15 Behierite (Ta,Nb)BO4 I 41/amd 4/m 2/m 2/m |
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06.AC.15 Schiavinatoite! (Nb,Ta)BO4 I 41/amd 4/m 2/m 2/m |
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Other Schiavinatoite Information
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References: |
NAME( AmMin, Vol 86, p 1536) PHYS. PROP.(AmMin, Vol 86, p 1536) OPTIC PROP.(AmMin, Vol 86, p 1536) |
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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Print or Cut-and-Paste your Schiavinatoite Specimen Label here :
Schiavinatoite
(Nb,Ta)BO4
Dana No: 24.01.02.02 Strunz No: 06.AC.15
Locality:
Notes:
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