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Oxy-dravite

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Oxy-dravite

San Martino al Cimino, Vico volcanic complex, Viterbo Province, Latium, Italy
Oxy-dravite

San Martino al Cimino, Vico volcanic complex, Viterbo Province, Latium, Italy
Oxy-dravite

San Martino al Cimino, Vico volcanic complex, Viterbo Province, Latium, Italy
Oxy-dravite

San Martino al Cimino, Vico volcanic complex, Viterbo Province, Latium, Italy
Oxy-dravite

San Martino al Cimino, Vico volcanic complex, Viterbo Province, Latium, Italy
Oxy-dravite

San Martino al Cimino, Vico volcanic complex, Viterbo Province, Latium, Italy
Oxy-dravite

San Martino al Cimino, Vico volcanic complex, Viterbo Province, Latium, Italy
Oxy-dravite

San Martino al Cimino, Vico volcanic complex, Viterbo Province, Latium, Italy
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About Oxy-draviteHide

Formula:
Na(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O
Colour:
brown, brown-black, red-black
Crystal System:
Trigonal
Name:
For its relationship to dravite, although it is NOT an analogue of dravite (see below).
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.


Classification of Oxy-draviteHide

IMA status:
Approved
Approval Year:
2012
Nickel-Strunz 10th (pending) ed.:
9.CK.05

9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions

Physical Properties of Oxy-draviteHide

Colour:
brown, brown-black, red-black

Chemical Properties of Oxy-draviteHide

Formula:
Na(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O
IMA Formula:
Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O
Elements listed:
Al, B, H, Mg, Na, O, Si - search for minerals with similar chemistry

Chemical AnalysisHide

Oxide wt%:
 1
SiO236.18 %
TiO20.36 %
B2O310.76 %
Al2O337.10 %
V2O30.03 %
Cr2O30.01 %
FeO1.14 %
MnO0.00 %
ZnO0.02 %
MgO7.84 %
CaO0.46 %
Na2O2.82 %
K2O0.04 %
F0.30 %
Cl0.00 %
O=F,Cl-0.13 %
Total:96.93 %
Sample references:
IDLocalityReference
1Beluga sapphire property, Kimmirut, Baffin Island, Nunavut, CanadaBelley, 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-draviteHide

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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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-draviteHide

Type Locality:
ⓘ Osarara, Narok County, Kenya
Place of Conservation of Type Material:
Museum of Mineralogy, Earth Sciences Department, Sapienza University of Rome, Rome, Italy, catalogue number 33066

Synonyms of Oxy-draviteHide

Relationship of Oxy-dravite to other SpeciesHide

Member of:
Tourmaline Group
Other Members of this group:
AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
BosiiteNaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig.
Chromo-alumino-povondraiteNa(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
DarrellhenryiteNa(LiAl2)Al6(BO3)3Si6O18(OH)3O Trig. 3m : R3m
DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
Fluor-draviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-feruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3F
Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-schorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-tsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-uviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Foitite(□,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OHTrig. 3m : R3m
LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
LucchesiiteCaFe2+3 Al6(Si6O18)(BO3)3(OH)3OTrig. 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.
MaruyamaiteK(MgAl2)(Al5Mg)(BO3)3(Si6O18)(OH)3OTrig. 3m : R3m
OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig.
Oxy-chromium-draviteNa(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
Oxy-foitite□(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m (3 2/m) : R3m
Oxy-rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O
Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Oxy-uviteCaMg3Al6(Si6O18)(BO3)3(OH)3O
Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3OTrig. 3m : R3m
PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig.
Rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
TsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
UM2000-64-SiO:BFeHKMgK, Mg, Fe, Si, B, O, H
Unnamed (Pb-dominant Tourmaline)(Pb,Na)(Li,Al)3Al6(Si6O18)(BO3)3(OH)3(F,OH)
Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)Trig. 3m : R3m
Vanadio-oxy-chromium-draviteNa(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m

Related Minerals - Nickel-Strunz GroupingHide

9.CK.Fluor-schorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.DarrellhenryiteNa(LiAl2)Al6(BO3)3Si6O18(OH)3O Trig. 3m : R3m
9.CK.AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
9.CK.05Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig.
9.CK.05DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Foitite(□,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OHTrig. 3m : R3m
9.CK.05LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig.
9.CK.05PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig.
9.CK.05SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Magnesio-foitite(□,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig.
9.CK.05Rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05TsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Oxy-rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O
9.CK.05Luinaite-(OH)Na(Fe2+)3Al6(Si6O18)(BO3)3(OH)3(OH)Mon. m : Bm
9.CK.05Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Chromo-alumino-povondraiteNa(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-draviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Oxy-chromium-draviteNa(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
9.CK.05Fluor-tsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Vanadio-oxy-chromium-draviteNa(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
9.CK.05Uvite (OH-dominant end-member)Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-uviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m
9.CK.10Abenakiite-(Ce)Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)OTrig. 3 : R3
9.CK.15ScawtiteCa7(Si3O9)2CO3 · 2H2OMon. 2/m
9.CK.20Steenstrupine-(Ce)Na14Mn2+2(Fe3+,Mn3+)2Ce6(Zr,Th)(Si6O18)2(PO4)6(HPO4)(OH)2 · 2H2OTrig.
9.CK.20Thorosteenstrupine(Ca,Th,Mn)3Si4O11F · 6H2O

Other InformationHide

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-draviteHide

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-draviteHide

Localities for Oxy-draviteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Argentina
 
  • San Luis
    • Coronel Pringles department
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
 
  • Gulf of Mexico
    • Sigsbee Abyssal Plain
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
 
  • Cochabamba
    • Chapare Province
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
 
  • Nunavut
    • Baffin Island
      • Kimmirut (Lake Harbour)
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
  • Saskatchewan
    • Athabasca Basin
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
 
  • Vysočina Region
    • Třebíč District
      • Třebíč
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.
    • Žďár nad Sázavou District
      • Velké Meziříčí (Groß Meseritsch; Groß Meseritz)
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
 
  • Latium
    • Viterbo Province
      • Vico volcanic complex (Vico Lake)
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.
  • Piedmont
    • Cuneo Province
      • Maira Valley
        • Canosio
          • Vallone della Valletta
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.
    • Verbano-Cusio-Ossola Province
      • Ossola Valley
        • Vigezzo Valley
          • Trontano
            • Pizzo Marcio
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
  • Narok County
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
 
  • Khomas Region
    • Windhoek District
Sun, H. et al. (2006) Geological Society of America annual meeting 2006, abstracts, paper # 118-23.
Russia
 
  • Chukotka Autonomous Okrug
    • Ilirney ore district
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.
    • Vesenniy
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.
  • Irkutsk Oblast
    • Lake Baikal area
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
      • Slyudyanka (Sludyanka)
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.
  • Sverdlovsk Oblast
    • Berezovsk
      • Berezovsk Deposit
The Canadian Mineralogist, V 42, 2004, pp. 1065-1078.
  • Zabaykalsky Krai
    • Chitinskaya Oblast
      • Vershino-Darasunskiy
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
 
  • Banská Bystrica Region
    • Rimavská Sobota Co.
      • Tisovec
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
 
  • Ticino (Tessin)
    • Leventina
      • Chironico Valley
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
 
  • Connecticut
    • Middlesex Co.
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
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