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Oxy-dravite

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Formula:
Na(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O
System:
Trigonal
Colour:
brown, brown-black, ...
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 subnitted 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 2012
9.CK.05

9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
mindat.org URL:
http://www.mindat.org/min-10966.html
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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

Physical Properties of Oxy-dravite

Colour:
brown, brown-black, red-black

Crystallography of Oxy-dravite

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Space Group Setting:
R3m
Cell Parameters:
a = 15.9273(2) Å, c = 7.2001(1) Å
Ratio:
a:c = 1 : 0.452
Unit Cell Volume:
V 1,581.81 ų (Calculated from Unit Cell)
X-Ray 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)

Chemical Properties of Oxy-dravite

Formula:
Na(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O
Essential elements:
All elements listed in formula:

Relationship of Oxy-dravite to other Species

Other Members of Group:
AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)
BosiiteNaFe33+(Al4Mg2)(Si6O18)(BO3)3(OH)3O
Chromium-draviteNa(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
Chromo-alumino-povondraiteNa(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3O
DarrellhenryiteNa(LiAl2)Al6(BO3)3Si6O18(OH)3O
DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)
Fluor-buergeriteNa(Fe33+)Al6(Si6O18)(BO3)3O3F
Fluor-draviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3F
Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F
Fluor-feruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3F
Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
Fluor-schorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3F
Fluor-tsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3F
Fluor-uviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3F
Foitite(□,Na)(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3OH
LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Luinaite-(OH)Na(Fe2+)3Al6(Si6O18)(BO3)3(OH)3(OH)
Magnesio-foitite(□,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
MaruyamaiteK(MgAl2)(Al5Mg)(BO3)3(Si6O18)(OH)3O
OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)
Oxy-chromium-draviteNa(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O
Oxy-rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O
Oxy-schorlNa(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3O
Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3O
PovondraiteNaFe33+(Mg2Fe43+)(Si6O18)(BO3)3(OH)3O
Rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)
SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
TsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH)
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)
UviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Vanadio-oxy-chromium-draviteNa(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O
Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O
9.CK.Fluor-schorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3F
9.CK.05Fluor-buergeriteNa(Fe33+)Al6(Si6O18)(BO3)3O3F
9.CK.05Chromium-draviteNa(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
9.CK.05DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
9.CK.05ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
9.CK.05FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)
9.CK.05Foitite(□,Na)(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3OH
9.CK.05LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
9.CK.05OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)
9.CK.05PovondraiteNaFe33+(Mg2Fe43+)(Si6O18)(BO3)3(OH)3O
9.CK.05SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
9.CK.05Magnesio-foitite(□,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
9.CK.05Rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)
9.CK.05Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3O
9.CK.05Oxy-rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O
9.CK.05Chromo-alumino-povondraiteNa(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3O
9.CK.05Fluor-draviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3F
9.CK.05Fluor-uviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3F
9.CK.10Abenakiite-(Ce)Na26Ce6(Si6O18)(PO4)6(CO3)6(SO3)
9.CK.15ScawtiteCa7(Si3O9)2CO3 · 2H2O
9.CK.20Steenstrupine-(Ce)Na14Mn22+(Fe3+,Mn3+)2Ce6(Zr,Th)(Si6O18)2(PO4)6(HPO4)(OH)2 · 2H2O
9.CK.20ThorosteenstrupineCaMnThSi4O11(OH)F · 6H2O

Other Names for Oxy-dravite

Name in Other Languages:

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:
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

Localities for Oxy-dravite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Argentina
 
  • San Luis
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
Bolivia
 
  • Cochabamba Department
    • 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
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • Vysočina Region
      • 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
        • Velké Meziříčí
Burianek, D. & Novak, M. (2004): Morphological and compositional evolution of tourmaline from nodular granite at Lavicky near Velke Mezirici, Moldanubicum, Czech Republic. Journal of the Czech Geological Society 49, 81-90.
Kenya
 
  • Coast Province
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
  • Rift Valley Province
    • Narok District
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
 
  • Omaheke Region
Sun, H. et al. (2006) Geological Society of America annual meeting 2006, abstracts, paper # 118-23.
Russia
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya 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
  • Urals Region
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Ekaterinburg (Sverdlovsk)
          • Berezovskii (Berezovskii Zavod)
            • Berezovskoe Au Deposit (Berezovsk Mines)
The Canadian Mineralogist, V 42, 2004, pp. 1065-1078.
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
Mineral and/or Locality  
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