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Crystal System:
Named after Günter Werding, professor of mineralogy, Institut für Mineralogie, Ruhr University, Bochum, Germany.
This page provides mineralogical data about Werdingite.

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Classification of WerdingiteHide

Approval Year:

9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral [4] and greater coordination

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
3 : Si2O7 Groups and O, OH, F, and H2O with[Si2O7] with borate groups

17 : Silicates Containing other Anions
5 : Borosilicates

Physical Properties of WerdingiteHide


Optical Data of WerdingiteHide

Biaxial (-)
RI values:
nα = 1.614 nβ = 1.646 nγ = 1.651
Measured: 33° to 42°, Calculated: 42°
Max Birefringence:
δ = 0.037
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r > v moderately strong

Chemical Properties of WerdingiteHide

IMA Formula:
Common Impurities:

Crystallography of WerdingiteHide

Crystal System:
Cell Parameters:
a = 7.99 Å, b = 8.15 Å, c = 11.4 Å
α = 110.45°, β = 110.85°, γ = 84.66°
a:b:c = 0.98 : 1 : 1.399
Unit Cell V:
649.60 ų (Calculated from Unit Cell)

Type Occurrence of WerdingiteHide

Synonyms of WerdingiteHide

Other Language Names for WerdingiteHide

Related Minerals - Nickel-Strunz GroupingHide

9.BD.05BertranditeBe4(Si2O7)(OH)2Orth. mm2 : Cmc21
9.BD.10HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
9.BD.15JunitoiteCaZn2Si2O7 · H2OOrth. mm2
9.BD.20Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
9.BD.20Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
9.BD.25VistepiteSnMn4B2Si4O16(OH)2Tric. 1
9.BD.30BoralsiliteAl16B6Si2O37Mon. 2/m : B2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.5.3SearlesiteNa(H2BSi2O7)Mon. 2 : P21
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.8PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.10DatoliteCaB(SiO4)(OH)Mon. 2/m : P21/b
17.5.11DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
17.5.12HowliteCa2B5SiO9(OH)5Mon. 2/m : P21/b
17.5.13BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
17.5.14OyeliteCa10Si8B2O29 · 12.5H2OOrth.
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm (2/m 2/m 2/m)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2OTrig. 3m (3 2/m) : R3m
17.5.17SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
17.5.21Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14Trig. 3m : R3m
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
17.5.25Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
17.5.26Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.28 FerridraviteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
17.5.30Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)Trig. 3m : R3m
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11Hex. 6/m : P6/m
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2ClxOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
17.5.44SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.45Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.47Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
17.5.48HomiliteCa2(Fe2+,Mg)B2Si2O10Mon. 2/m : P21/b
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
17.5.50Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.

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 WerdingiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1990): 75: 415-420.
American Mineralogist (1991): 76: 246-256.
New Minerals (1997), New Minerals 1990-1994.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002), Reviews in Mineralogy, v. 33, Mineralogical Society of America.
Grew, E.S., Yates, M.G., Huijsmans, J.P.P., McGee, J.J., Shearer, C.K., Wiedenbeck, M., and Rouse, R.C. (1998) Werdingite, a borosilicate new to granitic pegmatites. Canadian Mineralogist: 36: 399-414.

Internet Links for WerdingiteHide

Localities for WerdingiteHide

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.
  • Eastern Antarctica
    • Princess Elizabeth Land
      • Ingrid Christensen Coast
        • Prydz Bay
Wadokski, E. R. Grew, E.S. & Yates, M.G. (2011): Compositional evolution of tourmaline-supergroup minerals from granitic pegmatites in the Larsemann Hills, East Antartica. Canadian Mineralogist. 49: 382-405; Maas, R., Grew, E. S., & Carson, C. J. (2015). Isotopic Constraints (Pb, Rb-Sr, Sm-Nd) on the Sources of Early Cambrian Pegmatites with Boron and Beryllium Minerals in the Larsemann Hills, Prydz Bay, Antarctica. The Canadian Mineralogist, 53:249-272
  • Northern Territory
    • Central Desert Region
Am Min 93:283-299; Palya, A. P., Buick, I. S., & Bebout, G. E. (2011). Storage and mobility of nitrogen in the continental crust: Evidence from partially melted metasedimentary rocks, Mt. Stafford, Australia. Chemical Geology, 281(3-4), 211-226.
Czech Republic
  • Vysočina Region
    • Žďár nad Sázavou District
      • Křižanov
CEMPÍREK, Jan a Milan NOVÁK a Zdeněk DOLNÍČEK a Jana KOTKOVÁ a Radek ŠKODA. Crystal chemistry and origin of grandidierite, ominelite, boralsilite, and werdingite from the Bory Granulite Massif, Czech Republic American Mineralogist, Mineralogical Society of America, 95, 10, od s. 1533-1547, 15 s. ISSN 0003-004X. 2010
  • Anosy
    • Taolañaro (Fort Dauphin)
      • Analapatsy
Grew, E. S. et al. (1998): Werdingite, a borosilicate new to granitic pegmatites, The Canadian Mineralogist 36, 399-414 + [AmMin 84:993]
  • Rogaland
    • Lund
      • Flatestøl
Grew, E. S. et al. (1998): Werdingite, a borosilicate new to granitic pegmatites, The Canadian Mineralogist 36, 399-414 + http://www.mineralogicalassociation.ca/doc/abstracts/cm2_Vol36_Avr98.pdf. / p. 30
South Africa (TL)
  • Northern Cape
    • Namakwa District (Namaqualand)
      • Gordonia District
Moore, J. M., Waters, D. J., & Niven, M. L. (1990). Werdingite, a new borosilicate mineral from the granulite facies of the western Namaqualand metamorphic complex, South Africa. American Mineralogist, 75(3-4), 415-420.
      • Okiep Copper District
Hokada, T., Motoyoshi, Y., Hiroi, Y., Shimura, T., Yuhara, M., Shiraishi, K., ... & Knoper, M. W. (2001). Petrography and mineral chemistry of high-grade pelitic gneisses and related rocks from Namaqualand, South Africa. Memoirs of National Institute of Polar Research. Special issue, 55, 105-126.
  • Mashonaland West
MinMag 61:713 (1997)
Grew, E. S., Yates, M. G., Shearer, C. K., & Wiedenbeck, M. (1997). Werdingite from the Urungwe district, Zimbabwe. Mineralogical Magazine, 61(5), 713-718.
Mineral and/or Locality  
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