Oxy-dravite
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About Oxy-dravite
Formula:
Na(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O
Colour:
brown, brown-black, red-black
Crystal System:
Trigonal
Member of:
Name:
For its relationship to dravite, although it is NOT an analogue of dravite (see below).
Type Locality:
Tourmaline Group.
Oxy-dravite has been used as a preliminary working name for a much-studied new member of the tourmaline group which has already appeared several times in the mineralogical literature. It was submitted and approved as a new species by the IMA in 2012.
This species is related to dravite by substitution of one OH by (ideally) one O, the altered charge balance being compensated by replacing one Mg by a trivalent Al/Fe. This different charge balance means that "oxy-dravite" is not a true analogue of dravite.
Compare also oxy-schorl.
Originally (as an unapproved species) reported from Alto Chapare District, Chapare Province, Cochabamba Department, Bolivia.
Oxy-dravite has been used as a preliminary working name for a much-studied new member of the tourmaline group which has already appeared several times in the mineralogical literature. It was submitted and approved as a new species by the IMA in 2012.
This species is related to dravite by substitution of one OH by (ideally) one O, the altered charge balance being compensated by replacing one Mg by a trivalent Al/Fe. This different charge balance means that "oxy-dravite" is not a true analogue of dravite.
Compare also oxy-schorl.
Originally (as an unapproved species) reported from Alto Chapare District, Chapare Province, Cochabamba Department, Bolivia.
Classification of Oxy-dravite
Approved
Approval Year:
2012
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
Physical Properties of Oxy-dravite
Colour:
brown, brown-black, red-black
Chemical Properties of Oxy-dravite
Formula:
Na(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O
IMA Formula:
Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O
Chemical Analysis
Oxide wt%:
1 | |
---|---|
SiO2 | 36.18 % |
TiO2 | 0.36 % |
B2O3 | 10.76 % |
Al2O3 | 37.10 % |
V2O3 | 0.03 % |
Cr2O3 | 0.01 % |
FeO | 1.14 % |
MnO | 0.00 % |
ZnO | 0.02 % |
MgO | 7.84 % |
CaO | 0.46 % |
Na2O | 2.82 % |
K2O | 0.04 % |
F | 0.30 % |
Cl | 0.00 % |
O=F,Cl | -0.13 % |
Total: | 96.93 % |
Sample references:
ID | Locality | Reference |
---|---|---|
1 | Beluga sapphire property, Kimmirut, Baffin Island, Nunavut, Canada | Belley, P, et al. (2017) Origin Of Scapolite-Hosted Sapphire (Corundum) Near Kimmirut, Baffin Island, Nunavut, Canada The Canadian Mineralogist,55(4):669 http://dx.doi.org/10.3749/canmin.1700018 |
Crystallography of Oxy-dravite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 15.9273(2) Å, c = 7.2001(1) Å
Ratio:
a:c = 1 : 0.452
Unit Cell V:
1,581.81 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
6.377 | (44) |
4.222 | (67) |
3.983 | (64) |
3.483 | (84) |
2.963 | (100) |
2.576 | (68) |
2.041 | (35) |
1.915 | (52) |
Type Occurrence of Oxy-dravite
Place of Conservation of Type Material:
Museum of Mineralogy, Earth Sciences Department, Sapienza University of Rome, Rome, Italy, catalogue number 33066
Synonyms of Oxy-dravite
Relationship of Oxy-dravite to other Species
Member of:
Other Members of this group:
Adachiite | CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
Bosiite | NaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Chromium-dravite | Na(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH) | Trig. |
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 |
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 | Ca(Mg3)MgAl5(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. |
Maruyamaite | K(MgAl2)(Al5Mg)(BO3)3(Si6O18)(OH)3O | Trig. 3m : R3m |
Olenite | Na(Al3)Al6(Si6O18)(BO3)3O3(OH) | Trig. |
Oxy-chromium-dravite | Na(Cr)3(Cr4Mg2)(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 | ☐(LiAl2)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 |
Povondraite | NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O | Trig. |
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, Mg, Fe, Si, B, O, H | |
Unnamed (Pb-dominant Tourmaline) | (Pb,Na)(Li,Al)3Al6(Si6O18)(BO3)3(OH)3(F,OH) | |
Uvite Series | Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/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 |
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.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. |
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. |
9.CK.05 | Povondraite | NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O | Trig. |
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. |
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-rossmanite | ☐(LiAl2)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 | Uvite (OH-dominant end-member) | Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
9.CK.05 | Fluor-uvite | Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
9.CK.05 | Vanadio-oxy-dravite | NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m |
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+2(Fe3+,Mn3+)2Ce6(Zr,Th)(Si6O18)2(PO4)6(HPO4)(OH)2 · 2H2O | Trig. |
9.CK.20 | Thorosteenstrupine | (Ca,Th,Mn)3Si4O11F · 6H2O |
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 Oxy-dravite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hawthorne, F.C. & Henry, D.J. (1999): "Classification of the minerals of the tourmaline group", Eur. J. Mineral. 11:201-215.
Zacek, V., Fryda, J., Petrov, A., Hyrsl, J. (2000): "Tourmalines of the povondraite - (oxy)dravite series from the cap rock of meta-evaporite in Alto Chapare, Cochabamba, Bolivia", Journal of the Czech Geological Society 45:1-2, 3-12.
Novák, M., Povondra, P. & Selway, Julie B. (2004): Schorl-oxy-schorl to dravite-oxy-dravite tourmaline from granitic pegmatites; examples from the Moldanubicum, Czech Republic. European Journal of Mineralogy 16, 323-333.
Bosi, F. and Skogby, H. (2012): Oxy-dravite, IMA 2012-004a. CNMNC Newsletter No. 14, October 2012, page 1285; Mineralogical Magazine, 76, 1281-1288.
Renata Čopjaková, Radek Škoda & Michaela Vašinová Galiová (2012): „Oxy-dravit“ z turmalinitů krkonošsko-jizerského krystalinika [„Oxy-dravite“ from tourmalinites of the Krkonoše-Jizera Crystalline Massif]. Bull. mineral.-petrolog. Odd. Nár. Muz. (Praha) 20 ( 1), 37-46.
Bosi, F. and Skogby, H. (2013): Oxy-dravite, Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup. Am. Mineral. 98, 1442-1448.
Gatta, G., D, Bosi, F., McIntyre, G. J., and Skogby, H. (2014): First accurate location of two proton sites in tourmaline: A single-crystal neutron diffraction study of oxy-dravite. Mineralogical Magazine 78, 681-692.
Internet Links for Oxy-dravite
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https://www.mindat.org/min-10966.html
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Localities for Oxy-dravite
Locality List




All localities listed without proper references should be considered as questionable.
Argentina | |
| Henry, D. J. & de Brodtkorb, M. K. (2009): Mineral chemistry and chemical zoning in tourmalines, Pampa del Tamboreo, San Luis, Argentina. Journal of South American Earth Sciences 28, 132-141. |
Atlantic Ocean | |
| Henry, D., et al. Sector-zoned tourmaline from the cap rock of a salt dome. European Journal of Mineralogy, 16, 335-344 (in press). www.geol.lsu.edu/henry/Research/tourmaline/caprock_tur/turcaprock.htm; Davis, J. B., & Bray, E. E. (1969). Analyses of oil and cap rock from Challenger (Sigsbee) Knoll. Initial reports of the Deep Sea drilling project, 1, 415-499. |
Bolivia | |
| Zacek, V., Fryda, J., Petrov, A., Hyrsl, J. (2000): Tourmalines of the povondraite-(oxy)dravite series from the cap rock of meta-evaporite in Alto Chapare, Cochabamba, Bolivia. - Journal of the Czech Geological Society 45/1-2, 3-12 |
Canada | |
| Belley, P, et al. (2017) Origin Of Scapolite-Hosted Sapphire (Corundum) Near Kimmirut, Baffin Island, Nunavut, Canada The Canadian Mineralogist,55(4):669 http://dx.doi.org/10.3749/canmin.1700018 |
| Adlakha, E.E. & Hattori, K. (2016): Paragenesis and composition of tourmaline types along the P2 fault and Mcarthur River uranium deposit, Athabasca Basin, Canada. Canadian Mineralogist, 54, 661-679. |
Czech Republic | |
| Cempírek J., Houzar S., Novák M., Groat L.A., Selway J.B., Šrein V. (2013): Crystal structure and compositional evolution of vanadium-rich oxy dravite from graphite quartzite at Bítovánky, Czech Republic. Journal of Geosciences, 58, 149-162. |
| Burianek, D. & Novak, M. (2004): Morphological and compositional evolution of tourmaline from nodular granite at Lavičky near Velké Meziříčí, Moldanubicum, Czech Republic. Journal of the Czech Geological Society 49, 81-90. |
Italy | |
| in the collection of Christof Schäfer; Chukanov, N.V., Chervonnyi, A.D. (2016): Infrared spectroscopy of minerals and related compounds. Springer, Cham Heidelberg Dordrecht New York London, page 511. |
| Bosi, F., Cámara, F., Ciriotti, M.E., Hålenius, U., Reznitskii, L., Stagno, V. (2017): Crystal-chemical relations and classification problems in tourmalines belonging to the oxy-schorl–oxy-dravite–bosiite–povondraite series. European Journal of Mineralogy, 29, 445-455. |
| Guastoni, A., Diella, V., Pezzotta, F., Demartin, F. (2007): Vigezzite and associated Nb-Ta oxides of emerald pegmatitic deposits of Vigezzo Valley (Western Alps, Italy). Crystallization Processes in Granitic Pegmatites - International Meeting. Cavoli, Elba Island, Italy, 23rd-29th May 2005. Abstracts; http://www.minsocam.org/msa/Special/Pig/PIG_Articles/Elba%20Abstracts%2010%20Guastoni.pdf; Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" di Alba, Ed., Alba, 607 pp.; Guastoni, A., Diella, V., Pezzotta, F. (2008): Vigezzite and associated oxides of Nb–Ta from emerald-bearing pegmatites of the Vigezzo valley, Western Alps, Italy. Canadian Mineralogist, 46, 619-633; Boscardin, M., Mattioli, V., Rocchetti, I. (2013): Minerali della Valle Vigezzo. Litotipografia Alcione, Lavis (Trento), 229 pp. |
Kenya | |
Bosi, F. & Lucchesi, S. (2004) European Journal of Mineralogy, 16, 335-344; American Mineralogist Crystal Structure Database - rruff.geo.arizona.edu/AMS/minerals/Oxy-dravite | |
| Bosi, F. and Skogby, H. (2012): Oxy-dravite, IMA 2012-004a. CNMNC Newsletter No. 14, October 2012, page 1285; Mineralogical Magazine, 76, 1281-1288; Bosi, F. and Skogby, H. (2013): Oxy-dravite, Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup. Am. Mineral. 98, 1442-1448; Gatta, G., D, Bosi, F., McIntyre, G. J., and Skogby, H. (2014): First accurate location of two proton sites in tourmaline: A single-crystal neutron diffraction study of oxy-dravite. Mineralogical Magazine 78, 681-692. |
Namibia | |
| Sun, H. et al. (2006) Geological Society of America annual meeting 2006, abstracts, paper # 118-23. |
Russia | |
| 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. |
| 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. |
| Bosi, F. & Lucchesi, S. (2004) European Journal of Mineralogy, 16, 335-344; American Mineralogist Crystal Structure Database - rruff.geo.arizona.edu/AMS/minerals/Oxy-dravite |
| Reznitskii, L., Clark, C. M., Hawthorne, F. C., Grice, J. D., Skogby, H., Hålenius, U., & Bosi, F. (2014). Chromo-alumino-povondraite, NaCr3 (Al4Mg2)(Si6O18)(BO3) 3 (OH) 3O, a new mineral species of the tourmaline supergroup. American Mineralogist, 99(8-9), 1767-1773. |
| The Canadian Mineralogist, V 42, 2004, pp. 1065-1078. |
| 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., Ertl A., Števko M., Giester G., Sečkár P. (2015): Acicular zoned tourmaline (magnesio-foitite to foitite) from a quartz vein near Tisovec, Slovakia: the relationship between crystal chemistry and acicular habit. Canadian Mineralogist, 53, 2, 221-234. |
Switzerland | |
| Charlotte Redler, Alfred Irouschek, Teresa Jeffries and Reto Gieré (2016): Origin and Formation of Tourmaline-rich Cordierite-bearing Metapelitic Rocks from Alpe Sponda, Central Alps (Switzerland). Journal of Petrology, 57, 277-308. |
USA | |
| Bosi, F. & Lucchesi, S. (2004) European Journal of Mineralogy, 16, 335-344; American Mineralogist Crystal Structure Database - rruff.geo.arizona.edu/AMS/minerals/Oxy-dravite |
San Martino al Cimino, Vico volcanic complex, Viterbo Province, Latium, Italy