SUPPORT US. Covid-19 has significantly affected our fundraising. Please help!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral Quiz
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography


This page is currently not sponsored. Click here to sponsor this page.
Crystal System:
Named after Günter Werding, professor of mineralogy, Institut für Mineralogie, Ruhr University, Bochum, Germany.
Werdingite was first described from the Bok se Puts Farm, South Africa by Moore et al. (1990). However, the mineral was first observed by the french mineralogist Alfred Lacroix in material collected at Cap Andrahomana, Madagascar (Lacroix 1922). He described it then as a colorless mineral optically distinct from grandidierite. It was also later reported as an "unknown mineral" from Almgjotheii, Rogaland, Norway by Huijsmans (1981) and Huijsmans et al. (1982). This material was later found to consist of werdingite and boralsite (Grew et al. 1998).

Hide all sections | Show all sections

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)

Crystal StructureHide

Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
CIF File    Best | x | y | z | a | b | c
Stop | Start
Console Off | On | Grey | Yellow
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001344WerdingiteNiven M L, Waters D J, Moore J M (1991) The crystal structure of werdingite, (Mg,Fe)2Al12(Al,Fe)2Si4(B,Al)4O37, and its relationship to sillimanite, mullite and grandidierite American Mineralogist 76 246-25619910293
0018636WerdingiteGrew E S, Armbruster T, Lazic P, Yates M G, Medenbach O, Huijsmans J P P (2011) Werdingite from a pegmatite at Almgjotheii, Rogaland, Norway: The role of iron in a borosilicate with a mullite-type structure European Journal of Mineralogy 23 577-5892011Bok se Puts, Namaqualand, South Africa0293
0018637WerdingiteGrew E S, Armbruster T, Lazic P, Yates M G, Medenbach O, Huijsmans J P P (2011) Werdingite from a pegmatite at Almgjotheii, Rogaland, Norway: The role of iron in a borosilicate with a mullite-type structure European Journal of Mineralogy 23 577-5892011Almgjotheii, Norway0293
CIF Raw Data - click here to close

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.30BoralsiliteAl16B6O30(Si2O7)Mon. 2/m : B2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.5.3SearlesiteNa(H2BSi2O7)Mon. 2 : P21
17.5.4OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig. 3m : R3m
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
17.5.18Stillwellite-(Ce)(Ce,La,Ca)BSiO5Trig. 3 : P31
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
17.5.30Fluor-uvite-Uvite Series
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
17.5.37Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
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(Ba,Pb,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)
Lacroix, A. (1922): Mineralogie de Madagascar l, 2. Challamel, Paris, France.
Huijsmans, J.P.P. (1981) A grandidierite bearing pegmatite from the Almgjotheii, Rogaland, SW Norway. M.Sc. thesis (Petrology), Inst. of Earth Sciences, State University of Utrecht, The Netherlands (in Dutch).
Huijsmans, J.P.P., Barton, M. & van Bergen, M.J. (1982): A pegmatite containing Fe-rich grandidierite, Ti-richdumortierite and tourmaline from the Precambrian, high-grade metamorphic complex of Rogaland, S-W.Norway. Neues Jahrbuch für Mineralogie, Abhandlungen 133 (3): 249-261
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, 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
      • Bory
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)
      • Andranobory
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 + / p. 30
South Africa
  • Northern Cape
    • Namakwa
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.
    • ZF Mgcawu
      • 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.
  • 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  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © and the Hudson Institute of Mineralogy 1993-2021, except where stated. Most political location boundaries are © OpenStreetMap contributors. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us - Report a bug/vulnerability Current server date and time: April 16, 2021 17:43:40 Page generated: March 15, 2021 06:00:21
Go to top of page