Povondraite
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About Povondraite
Formula:
NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
Colour:
Dark brown to brownish black
Lustre:
Resinous
Hardness:
7
Crystal System:
Trigonal
Member of:
Name:
Named in honor of Pavel Povondra (7 December 1924, Žamberk - 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, but 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.
Visit gemdat.org for gemological information about Povondraite.
The type locality was originally given imprecisely as the San Francisco mine, but 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.
Visit gemdat.org for gemological information about Povondraite.
Classification of Povondraite
Approved
IMA status notes:
Renamed by the IMA
Approval history:
Renamed by IMA: 1990
8/E.19-75
9.CK.05
9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
Dana 7th ed.:
61.3.1.8
61.3.1.6
61 : CYCLOSILICATES Six-Membered Rings
3 : Six-Membered Rings with borate groups
61 : CYCLOSILICATES Six-Membered Rings
3 : Six-Membered Rings with borate groups
Physical Properties of Povondraite
Resinous
Colour:
Dark brown to brownish black
Streak:
Brown
Hardness:
7 on Mohs scale
Cleavage:
None Observed
Optical Data of Povondraite
Type:
Uniaxial (-)
RI values:
nω = 1.820 nε = 1.751
Max Birefringence:
δ = 0.069

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Chemical Properties of Povondraite
Formula:
NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
IMA Formula:
NaFe3+3(Fe3+4Mg2)(Si6O18)(BO3)3(OH)3O
Common Impurities:
K,Mg,Al,Cu,Pb,Sn,Ti,V,H2O
Crystallography of Povondraite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 16.18 Å, c = 7.44 Å
Ratio:
a:c = 1 : 0.46
Unit Cell V:
1,686.79 ų (Calculated from Unit Cell)
Z:
3
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
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
Geological Environment
Geological Setting:
Saltdome caprock
Type Occurrence of Povondraite
Place of Conservation of Type Material:
Smithsonian
Synonyms of Povondraite
Other Language Names for Povondraite
Relationship of Povondraite to other Species
Member of:
Other Members of this group:
Adachiite | CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Alumino-oxy-rossmanite | Al3Al6(Si5AlO18)(BO3)3(OH)3O | Trig. 3m : R3m |
Bosiite | NaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Celleriite | ◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Chromium-dravite | Na(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Chromo-alumino-povondraite | Na(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Darrellhenryite | Na(LiAl2)Al6(BO3)3Si6O18(OH)3O | Trig. 3m : R3m |
Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Dutrowite | Na(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Feruvite | Ca(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Fluor-buergerite | Na(Fe3+3)Al6(Si6O18)(BO3)3O3F | Trig. 3m : R3m |
Fluor-dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Fluor-elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Fluor-feruvite | Ca(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3F | |
Fluor-liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Fluor-schorl | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Fluor-tsilaisite | Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Fluor-uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
Foitite | (◻,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OH | Trig. 3m : R3m |
Liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Lucchesiite | CaFe2+3 Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Luinaite-(OH) | Na(Fe2+)3Al6(Si6O18)(BO3)3(OH)3(OH) | Mon. m : Bm |
Magnesio-foitite | (◻,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Magnesio-lucchesiite | CaMg3Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Maruyamaite | K(MgAl2)(Al5Mg)(BO3)3(Si6O18)(OH)3O | Trig. 3m : R3m |
Olenite | Na(Al3)Al6(Si6O18)(BO3)3O3(OH) | Trig. 3m : R3m |
Oxy-chromium-dravite | Na(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Oxy-dravite | Na(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Oxy-foitite | ◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m (3 2/m) : R3m |
Oxy-rossmanite | ◻(Li0.5Al2.5)Al6(Si6O18)(BO3)3(OH)3O | |
Oxy-schorl | Na(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Oxy-uvite | CaMg3Al6(Si6O18)(BO3)3(OH)3O | |
Oxy-vanadium-dravite | Na(V)3(V4Mg2)Si6O18(BO3)3(OH)3O | Trig. 3m : R3m |
Princivalleite | Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Rossmanite | ◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Schorl | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Tsilaisite | Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
UM2000-64-SiO:BFeHKMg | (K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O | |
UM2008-52-SiO:AlBCaFFeHLiMgNa | (Ca,Na,◻)(Al,Li,Fe,Mg)3Al6[Si6O18](BO3)3(OH,O)3(F,O) | |
Unnamed (Pb-analogue of Fluor-liddicoatite) | (Pb,Na)(Li,Al)3Al6(Si6O18)(BO3)3(OH)3(F,OH) | |
Uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Vanadio-oxy-chromium-dravite | Na(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Vanadio-oxy-dravite | NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Povondraite associated with Microcline | K(AlSi3O8) |
Related Minerals - Nickel-Strunz Grouping
9.CK. | Fluor-schorl | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK. | Darrellhenryite | Na(LiAl2)Al6(BO3)3Si6O18(OH)3O | Trig. 3m : R3m |
9.CK. | Adachiite | CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK. | Bosiite | NaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK. | Celleriite | ◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK. | Alumino-oxy-rossmanite | Al3Al6(Si5AlO18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Fluor-buergerite | Na(Fe3+3)Al6(Si6O18)(BO3)3O3F | Trig. 3m : R3m |
9.CK.05 | Chromium-dravite | Na(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Feruvite | Ca(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Foitite | (◻,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OH | Trig. 3m : R3m |
9.CK.05 | Liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Olenite | Na(Al3)Al6(Si6O18)(BO3)3O3(OH) | Trig. 3m : R3m |
9.CK.05 | Schorl | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Magnesio-foitite | (◻,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Rossmanite | ◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Tsilaisite | Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Oxy-vanadium-dravite | Na(V)3(V4Mg2)Si6O18(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Oxy-dravite | Na(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Oxy-rossmanite | ◻(Li0.5Al2.5)Al6(Si6O18)(BO3)3(OH)3O | |
9.CK.05 | Luinaite-(OH) | Na(Fe2+)3Al6(Si6O18)(BO3)3(OH)3(OH) | Mon. m : Bm |
9.CK.05 | Fluor-elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Chromo-alumino-povondraite | Na(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Fluor-dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Oxy-schorl | Na(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Fluor-liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Oxy-chromium-dravite | Na(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Fluor-tsilaisite | Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Vanadio-oxy-chromium-dravite | Na(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.05 | Fluor-uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Vanadio-oxy-dravite | NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
9.CK.10 | Abenakiite-(Ce) | Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)O | Trig. 3 : R3 |
9.CK.15 | Scawtite | Ca7(Si3O9)2CO3 · 2H2O | Mon. 2/m |
9.CK.20 | Steenstrupine-(Ce) | Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 · 2H2O | Trig. |
9.CK.20 | Thorosteenstrupine | (Ca,Th,Mn)3Si4O11F · 6H2O |
Related Minerals - Dana Grouping (8th Ed.)
61.3.1.1 | Foitite | (◻,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OH | Trig. 3m : R3m |
61.3.1.2 | Liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
61.3.1.3 | Fluor-uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
61.3.1.4 | Feruvite | Ca(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
61.3.1.5 | Fluor-buergerite | Na(Fe3+3)Al6(Si6O18)(BO3)3O3F | Trig. 3m : R3m |
61.3.1.7 | Olenite | Na(Al3)Al6(Si6O18)(BO3)3O3(OH) | Trig. 3m : R3m |
61.3.1.8 | Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
61.3.1.9 | Dravite | Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
61.3.1.10 | Schorl | Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
61.3.1.11 | Chromium-dravite | Na(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
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.
References for Povondraite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Walenta, K. & Dunn, P. J. (1979): Ferridravite, a new mineral of the tourmaline group from Bolivia. American Mineralogist, 64, 945-948.
Grice, J.D., T.S. Ercit, and F.C. Hawthorne (1993): Povondraite, a redefinition of the tourmaline ferridravite. American Mineralogist 78, 433-436.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
New Minerals (1997), New Minerals 1990-1994.
Zacek, V., Petrov, A., and Hyrsl, J. (1998): Chemistry and origin of povondraite-bearing rocks from Alto Chapare, Cochabamba, Bolivia. Journal of the Czech Geological Society 43, 59-67.
Žáček, V., Frýda, J., Petrov, A. and Hyršl, J. (2000): Tourmalines of the povondraite-(oxy)dravite series from the caps rocks of meta-evaporite in Alto Chapare, Cochamba, Bolivia. Journal of the Czech Geological Society, 45, 3-12.
Internet Links for Povondraite
mindat.org URL:
https://www.mindat.org/min-3274.html
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Localities for Povondraite
Locality List




All localities listed without proper references should be considered as questionable.
Australia | |
| Jones, B. G., Carr, P. F. & Condliffe, E. (1981): Ferrian tourmaline from Bungonia, New South Wales. Journal of the Geological Society of Australia 28, 13-17. |
| Fetherston, J.M., Stocklmayer, S.M., Stocklmayer, V.C. (2013) Gemstones of Western Australia. Geological Survey of Western Australia, Mineral Resources Bulletin 25, 306 pages. |
| T Kapitany (pers comm) |
Austria | |
| B. Moser, H. P. Bojar: Carinthia II 192./112.:216-217 (2002) |
Bolivia | |
| Mineralogical Record: 32: 461; Zacek, V., Petrov, A., and Hyrsl, J. (1998), Chemistry and origin of povondraite-bearing rocks from Alto Chapare, Cochabamba, Bolivia. Journal of the Czech Geological Society: 43: 59-67. |
| (erroneously attributed to San Francisco mine in the type description) |
(erroneously attributed to this mine in the type description) | |
Brazil | |
| erroneously reported [MinRec 33:209] |
Russia | |
| Mineralogy of the Peschanka porphyry copper deposit, Chukchi Peninsula, Russia. in Abdurrahman, A., J. C. Ø. Andersen, and B. J. Williamson. "Meeting of the Geological Society’s Mineral Deposits Studies Group was held on the 2nd–4th January 2013 at the University of Leicester, UK." Applied Earth Science (Trans. Inst. Min. Metall. B) 121.4 (2012): 190-191. |
| Nikolaev, Y. N., Prokof’ev, V. Y., Apletalin, A. V., Vlasov, E. A., Baksheev, I. A., Kal’ko, I. A., & Komarova, Y. S. (2013). Gold-telluride mineralization of the Western Chukchi Peninsula, Russia: mineralogy, geochemistry, and formation conditions. Geology of Ore Deposits, 55(2), 96-124. |
| Baksheev, I. A., Prokofiev, V. Y., Trumbull, R., Wiedenbeck, M., Yapaskurt, V. O. (2015): Geochemical evolution of tourmaline in the Darasun gold district deposits, Transbaikal region, Russia: Evidence from chemical and boron isotope compositions in tourmaline. Mineralium Deposita, 50, 125-138. |
Baksheev, I. A., Prokofiev, V. Y., Trumbull, R., Wiedenbeck, M., Yapaskurt, V. O. (2015): Geochemical evolution of tourmaline in the Darasun gold district deposits, Transbaikal region, Russia: Evidence from chemical and boron isotope compositions in tourmaline. Mineralium Deposita, 50, 125-138. | |
Baksheev, I. A., Prokofiev, V. Y., Trumbull, R., Wiedenbeck, M., Yapaskurt, V. O. (2015): Geochemical evolution of tourmaline in the Darasun gold district deposits, Transbaikal region, Russia: Evidence from chemical and boron isotope compositions in tourmaline. Mineralium Deposita, 50, 125-138. | |
Slovakia | |
| - Bačík P., Uher P., Sýkora M., Lipka J., 2008: Low-Al tourmalines of the schorl-dravite - povondraite series in redeposited tourmalinites from the Western Carpathians, Slovakia. Canadian Mineralogist, 46, 5, 1117-1129. |
| - Bačík P., Uher P., Sýkora M., Lipka J., 2008: Low-Al tourmalines of the schorl-dravite - povondraite series in redeposited tourmalinites from the Western Carpathians, Slovakia. Canadian Mineralogist, 46, 5, 1117-1129. |
USA | |
| Robert Jemkins; FrOg On-line #1998-06 |
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Alto Chapare mining district, Chapare Province, Cochabamba, Bolivia