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Chromium-dravite

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Formula:
Na(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
System:
Trigonal
Colour:
Dark emerald-green to ...
Lustre:
Vitreous, Resinous
Hardness:
7 - 7½
Name:
For being the chromium analogue of dravite.
Tourmaline Group. The Cr3+ analogue of Dravite.

Originally named chromdravite (Rumantseva, 1983).

A detailed study by Vereshchagin et al. (2010) and Rozhdestvenskaya et al. (2011) strongly suggests that the "ideal" formula of chromdravite, NaMg3Cr6(BO3)3(Si6O18)(OH)4, is not realistic and should in fact be Na(Cr2Mg)(Cr4Mg2)(BO3)3(Si6O18)(OH)4 (Cr-Mg disorder on both Y and Z sites, leading to a more stable structure.)

Classification of Chromium-dravite

Renamed approved 2009
9.CK.05

9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
Dana 7th ed.:
61.3.1.13
61.3.1.11

61 : CYCLOSILICATES Six-Membered Rings
3 : Six-Membered Rings with borate groups
17.5.37

17 : Silicates Containing other Anions
5 : Borosilicates
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Type Occurrence of Chromium-dravite

Year of Discovery:
1983

Physical Properties of Chromium-dravite

Vitreous, Resinous
Colour:
Dark emerald-green to greenish-black.
Streak:
Greyish-green.
Hardness (Mohs):
7 - 7½

Crystallography of Chromium-dravite

Crystal System:
Trigonal
Cell Parameters:
a = 16.11Å, c = 7.27Å
Ratio:
a:c = 1 : 0.451
Unit Cell Volume:
V 1,634.02 ų (Calculated from Unit Cell)

Optical Data of Chromium-dravite

Type:
Uniaxial (-)
RI values:
nω = 1.778 nε = 1.772
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of Chromium-dravite

Formula:
Na(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
Essential elements:
All elements listed in formula:
Common Impurities:
Mn,Ti,V,Al,V,Ca

Relationship of Chromium-dravite to other Species

Other Members of Group:
AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)
BosiiteNaFe33+(Al4Mg2)(Si6O18)(BO3)3(OH)3O
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-draviteNa(MgAl2)MgAl5(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.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-draviteNa(MgAl2)MgAl5(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
17.5.1ManandoniteLi2Al4(Si2AlB)O10(OH)8
17.5.2ReedmergneriteNa[BSi3O8]
17.5.3SearlesiteNa(H2BSi2O7)
17.5.4OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.6KalborsiteK6Al4BSi6O20(OH)4Cl
17.5.7BoromuscoviteKAl2(BSi3O10)(OH)2
17.5.8PoudretteiteKNa2B3Si12O30
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.10DatoliteCa(HBSiO5)
17.5.11DanburiteCaB2Si2O8
17.5.12HowliteCa2B5SiO9(OH)5
17.5.13BakeriteCa4(H5B5Si3O20)
17.5.14OyeliteCa10Si8B2O29 · 12.5H2O
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2O
17.5.17Serendibite(Ca,Na)2(Mg,Fe2+)3(Al,Fe3+)3[O2|(Si,Al,B)6O18]
17.5.18Stillwellite-(Ce)(Ce,La,Ca)BSiO5
17.5.19Tadzhikite-(Ce)(Ca,Ce)4(Ce,Y)2(Ti4+,Fe3+,Al)[B4Si4O22](OH)2
17.5.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)
17.5.21Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
17.5.22Tritomite-(Ce)(Ce,La,Y,Th)5(Si,B)3(O,OH,F)13
17.5.23Tritomite-(Y)(Y,Ca,La,Fe)5(Si,B,Al)3(O,OH,F)13
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2
17.5.25Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3
17.5.26Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.28 Ferridravite
17.5.29Axinite-(Mg)Ca2MgAl2BSi4O15OH
17.5.30UviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
17.5.31GarrelsiteBa3NaSi2B7O16(OH)4
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11
17.5.33LeucospheniteBaNa4Ti2B2Si10O30
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2Clx
17.5.35TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2Cl
17.5.38WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15
17.5.39Werdingite(Mg,Fe)2Al14Si4B4O37
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)
17.5.41Axinite
17.5.42Tinzenite(Ca,Mn2+)2Mn2+Al2BSi4O15(OH)
17.5.44SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.45Fluor-buergeriteNa(Fe33+)Al6(Si6O18)(BO3)3O3F
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)
17.5.47Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
17.5.48HomiliteCa2(Fe2+,Mg)B2Si2O10
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2
17.5.50Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al(Be,Li)2-xB4Si4O22(OH)2
61.3.1.1Foitite(□,Na)(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3OH
61.3.1.2Magnesio-foitite(□,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
61.3.1.3Rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)
61.3.1.4LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
61.3.1.5UviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
61.3.1.5Fluor-uviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3F
61.3.1.6FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)
61.3.1.7Fluor-buergeriteNa(Fe33+)Al6(Si6O18)(BO3)3O3F
61.3.1.8PovondraiteNaFe33+(Mg2Fe43+)(Si6O18)(BO3)3(OH)3O
61.3.1.9OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)
61.3.1.10ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
61.3.1.11DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
61.3.1.12SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
61.3.1.14Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3O

Other Names for Chromium-dravite

Name in Other Languages:
Simplified Chinese:铬镁电气石
Spanish:Cromdravita
Traditional Chinese:鉻鎂電氣石

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 Chromium-dravite

Reference List:
Dunn, P.J. (1977): Chromium in dravite. Mineral. Mag., 41, 408-410.

Rumantseva, E.V. (1983): Chromdravite, a new mineral. Zap. Vses. Mineral. Obshch., 112, 222-226 (in Russian). [Abs. in American Mineralogist 69 (1984) 210].

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Bosi, Ferdinando; Lucchesi, Sergio; Reznitskii, Leonid (2004): Crystal chemistry of the dravite-chromdravite series. European Journal of Mineralogy 16, 345-352.

Vereshchagin, O.S., Rozhdestvenskaya, I.V., Frank-Kamenetskaya, O.V. & Zolotarev, A.A. (2010): Crystal chemistry and the nomenclature of chromium-bearing tourmalines. 20th General Meeting of the IMA (IMA2010), Budapest, Hungary, August 21-27, CD of Abstracts, p. 710.

Henry, D., Novák, M., Hawthorne, F.C., Ertl, A., Dutrow, B.L., Uher, P. & Pezzotta, F. (2011): Nomenclature of the tourmaline supergroup minerals. Am. Mineral., 96, 895-913.

Rozhdestvenskaya, I. V.; Vereshchagin, O. S.; Frank-Kamenetskaya, O. V.; Zolotarev, A. A.; Pekov, I. V. (2011): About crystal-chemical formula of chromdravite - mineral species from the tourmaline group. Zapiski Rossiiskogo Mineralogicheskogo Obshchestva (Proceedings of the Russian Mineralogical Society) 140, 93-99 (in Russian).

Vereshchagin, O. S., Rozhdestvenskaya, I. V., Frank-Kamenetskaya, O. V., Zolotarev, A. A. (2014): Ion substitutions and structural adjustment in Cr-bearing tourmalines. European Journal of Mineralogy 26, 309-321.


Internet Links for Chromium-dravite

Localities for Chromium-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.
Brazil
 
  • Minas Gerais
    • Jequitinhonha Valley
      • Coronel Murta
        • Barra de Salinas
erroneously reported [MinRec 33:209]
Canada
 
  • Québec
    • Nord-du-Québec
      • Baie-James
        • Otish Mts
ALEXANDRE, P., PETERSON, R.C., KYSER, K., LAYTON-MATHEWS, D. & JOY, B. (2014) High-Cr minerals from the Matoush uranium deposit in the Otish Basin, Quebec, Canada. Canadian Mineralogist 52, 61-75.
Finland
 
  • Eastern Finland Region
    • Kaavi
tw.strahlen.org/fotoatlas1/chromdravite_foto.html
India
 
  • Orissa
    • Keonjhar District
(see explanation under chromoaluminopovondraite)
Pakistan
 
  • Khyber Pakhtunkhwa (North-West Frontier Province)
    • Swat District (Swat Valley)
[Emeralds of the World - p24 English extraLapis Vol2 2002]
Russia
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Lake Baikal area
          • Slyudyanka (Sludyanka)
            • Pokhabikha River Valley
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
  • Northern Region
    • Karelia Republic
      • Lake Onega
        • Zaonezhie peninsula
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Jeff Weissman collection (purchased from Excalibur Mineral Company)
USA
 
  • New York
    • St. Lawrence Co.
      • Balmat-Edwards Zinc District
        • Balmat
Marian Lupulescu (New York State Museum) and Anatoly Kasatkin analyses.
Mineral and/or Locality  
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