Tuhualite Mineral Data + 
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- 66.3.4.1 Tuhualite [](Na,K)FeFe[Si6O15] C mca 2/m 2/m 2/m
- 66.3.4.2 Zektzerite NaLiZrSi6O15 C mca 2/m 2/m 2/m
- 66.3.4.3 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m
- VIII/F.30-10 Zektzerite NaLiZrSi6O15 C mca 2/m 2/m 2/m
- VIII/F.30-20 Tuhualite [](Na,K)FeFe[Si6O15] C mca 2/m 2/m 2/m
- VIII/F.30-30 Pellyite Ba2Ca(Fe,Mg)2Si6O17 C mcm 2/m 2/m 2/m
General Tuhualite Information |
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 Chemical Formula: |
[ ](Na,K)Fe++Fe+++[Si6O15] | ||
| Composition: |
Molecular Weight = 546.41 gm | ||
| Potassium 1.43 % K 1.72 % K2O | |||
| Sodium 3.37 % Na 4.54 % Na2O | |||
| Iron 20.44 % Fe 13.15 % FeO / 14.61 % Fe2O3 | |||
| Silicon 30.84 % Si 65.98 % SiO2 | |||
| Oxygen 43.92 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Na0.8K0.2Fe2+Fe3+Si6O15 | ||
| Environment: |
In volcanic rock. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1932 | ||
| Locality: |
Mayor (Tuhua) Island, Bay of Plenty (Opo Bay), Norht Island, New Zealand. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the locality. | ||
| Synonym: |
ICSD 17017 | ||
| PDF 10-440 | |||
Tuhualite Image | |||
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Images:
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Tuhualite Crystallography |
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| Axial Ratios: |
a:b:c =0.8281:1:0.585 | ||
| Cell Dimensions: |
a = 14.31, b = 17.28, c = 10.11, Z = 8; V = 2,499.97 Den(Calc)= 2.90 | ||
| Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mca | ||
| X Ray Diffraction: |
By Intensity(I/Io): 7.16(1), 2.77(0.9), 3.18(0.8), | ||
Physical Properties of Tuhualite |
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| Cleavage: |
[100] Good, [010] Good, [001] Good | ||
| Color: |
Blue violet, Dark blue, Black. | ||
| Density: |
2.89 | ||
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
| Hardness: |
3-4 - Calcite-Fluorite | ||
| Streak: |
reddish gray | ||
Optical Properties of Tuhualite |
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| Optical Data: |
Biaxial (+), a=1.608, b=1.612, g=1.621, bire=0.0130, 2V(Calc)=68, 2V(Meas)=61-70. | ||
| Pleochroism (x): |
deep purple. | ||
| Pleochroism (y): |
violet. | ||
| Pleochroism (z): |
pale pink. | ||
Calculated Properties of Tuhualite |
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| Electron Density: |
relectron=2.85 gm/cc |
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| Fermion Index |
Fermion Index = 0.01894 Boson Index = 0.98106 |
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| Photoelectric: |
PETuhualite = 7.44 barns/electron |
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| Radioactivity: |
GRapi = 20.32 (Gamma Ray American Petroleum Institute Units) Estimated Radioactivity from Tuhualite |
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Tuhualite Classification |
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| Dana Class: |
66.3.4.1 (66)Inosilicate Double-Width Unbranched Chains, W=2 | ||
| (66.3)with chains P>2 | |||
| (66.3.4)P=6 (Tahualite group) | |||
| Strunz Class: |
VIII/F.30-20 VIII - Silicates | ||
| VIII/F - Inosilicates (chain and band) Six chains [Si6O18]12- and six bands [Si12O30]12- | |||
| VIII/F.30 - Zektzerite - Pellyite series | |||
Other Tuhualite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Tuhualite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST 15 -École des Mines de Paris Search for Tuhualite using: Visit our Advertisers for Tuhualite : Translate Tuhualite Mineral Data : Ask about Tuhualite here : Print or Cut-and-Paste your Tuhualite Specimen Label here :
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- barely detectable 
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