Povondraite (original) (raw)
A valid IMA mineral species
About PovondraiteHide
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Formula:
NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
Colour:
Dark brown to brownish black
Name:
Named in honour of Pavel Povondra (7 December 1924, Žamberk, Ústí nad Orlicí District, Pardubice Region, Czech Republic - 9 September 2013), mineralogist at Charles University, Prague, Czech Republic, for his extensive work on the chemistry of the tourmaline group.
Povondraite was redefined (IMA 90-E) from the original “ferridravite” (Walenta and Dunn, 1979) because the initially assumed site assignments were incorrect and did not correspond to the Fe3+-equivalent of dravite (Grice et al. 1993). Hawthorne and Henry (1999) suggested that Mg is ordered at the Z site and should be part of the end-member formula.
The type locality was originally given imprecisely as the San Francisco mine. However, povondraite does not occur in the asbestos mine itself, but rather in the rock unit known as the Locotal Breccia, several hundred meters from the asbestos ore veins.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:3274:8
1c0e55ac-3677-4bec-b4b0-9fc107c6d09e
IMA Classification of PovondraiteHide
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IMA status notes:
Renamed by the IMA
IMA Formula:
NaFe3+3(Fe3+4Mg2)(Si6O18)(BO3)3(OH)3O
Approval history:
Renamed by IMA: 1990
Classification of PovondraiteHide
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9.CK.05
9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
61.3.1.6
61 : CYCLOSILICATES Six-Membered Rings
3 : Six-Membered Rings with borate groups
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Pov | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Pov | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of PovondraiteHide
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Colour:
Dark brown to brownish black
Comment:
Light is transmitted only in thin splinters.
Density:
3.26(3) g/cm3 (Measured) 3.33 g/cm3 (Calculated)
Optical Data of PovondraiteHide
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RI values:
_n_ω = 1.820 _n_ε = 1.751
δ = 0.069
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Comments:
E : light brown and O: dark brown, blackish brown to opaque.
Chemistry of PovondraiteHide
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Mindat Formula:
NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
Common Impurities:
K,Mg,Al,Cu,Pb,Sn,Ti,V,H2O
Crystallography of PovondraiteHide
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Class (H-M):
3_m_ - Ditrigonal Pyramidal
Cell Parameters:
a = 16.18 Å, c = 7.44 Å
Unit Cell V:
1,686.79 ų (Calculated from Unit Cell)
Morphology:
Equant and simple. Crystals are comprised of the second-order hexagonal prism {1120} and the trigonal pyramids, {1011} and {2021}.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0001555 | Povondraite | Grice J D, Ercit T S, Hawthorne F C (1993) Povondraite, a redefinition of the tourmaline ferridravite American Mineralogist 78 433-436 |  |
1993 | San Francisco mine, Villa Tunari, Bolivia | 0 | 293 |
| 0018783 | Povondraite | Grice J D, Ercit T S (1993) Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Neues Jahrbuch fur Mineralogie, Abhandlungen 165 245-266 | 1993 | San Francisco mine, Villa Tu nari, Bolivia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.63 Å | (100) |
| 6.63 Å | (90) |
| 4.05 Å | (90) |
| 3.05 Å | (90) |
| 3.61 Å | (80) |
| 5.13 Å | (70) |
| 4.71 Å | (70) |
Geological EnvironmentHide
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Geological Setting:
Saltdome caprock
Type Occurrence of PovondraiteHide
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General Appearance of Type Material:
Crystals (to several mm), intergrown or forming subparallel aggregates. Not easily recognized as tourmaline. Crystals are not elongated along the c axis, but are more equant in habit.
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Canada, M35899.
National Museum of Natural History, Washington, D.C., USA, 144478.
Geological Setting of Type Material:
Schist, possibly limited to younger fissures. Rare.
Associated Minerals at Type Locality:
Synonyms of PovondraiteHide
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Other Language Names for PovondraiteHide
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Relationship of Povondraite to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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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 PovondraiteHide
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References for PovondraiteHide
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Reference List:
Henry, Darell J., Novak, Milan, Hawthorne, Frank C., Ertl, Andreas, Dutrow, Barbara L., Uher, Pavel, Pezzotta, Federico (2011) Nomenclature of the tourmaline-supergroup minerals. American Mineralogist, 96 (5) 895-913 doi:10.2138/am.2011.3636
Localities for PovondraiteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.