Polyphite-VII
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Formula:
Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6
Lustre:
Vitreous
Hardness:
5
Crystal System:
Triclinic
This page provides mineralogical data about Polyphite-VII.
Unique Identifiers
Mindat ID:
7241
Long-form identifier:
mindat:1:1:7241:6
Similar Names
| Polyphite-VIII | Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 |
Physical Properties of Polyphite-VII
Vitreous
Hardness:
5 on Mohs scale
Optical Data of Polyphite-VII
Type:
Biaxial (-)
RI values:
nα = 1.6 nβ = 1.658 nγ = 1.676
Max. Birefringence:
δ = 0.076
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
r < v weak
Chemistry of Polyphite-VII
Mindat Formula:
Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6
Element Weights:
Crystallography of Polyphite-VII
Crystal System:
Triclinic
Synonyms of Polyphite-VII
Other Information
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 Polyphite-VII
mindat.org URL:
https://www.mindat.org/min-7241.html
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Please feel free to link to this page.
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References for Polyphite-VII
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