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Werdingite

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Formula:
Mg2Al14Si4B4O37
System:
Triclinic
Colour:
Brown-yellow
Lustre:
Vitreous
Hardness:
7
Name:
Named after Günter Werding, professor of mineralogy, Institut für Mineralogie, Ruhr University, Bochum, Germany.
This page provides mineralogical data about Werdingite.


Classification of Werdingite

Approved
Approval Year:
1988
9.BD.35

9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral [4] and greater coordination
56.3.2.1

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
17.5.39

17 : Silicates Containing other Anions
5 : Borosilicates

Physical Properties of Werdingite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Brown-yellow
Hardness (Mohs):
7

Optical Data of Werdingite

Type:
Biaxial (-)
RI values:
nα = 1.614 nβ = 1.646 nγ = 1.651
2V:
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:
Moderate
Dispersion:
r > v moderately strong

Chemical Properties of Werdingite

IMA Formula:
Mg2Al14Si4B4O37
Elements listed in formula:
Common Impurities:
Ti

Crystallography of Werdingite

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

Type Occurrence of Werdingite

Relationship of Werdingite to other Species

9.BD.05BertranditeBe4Si2O7(OH)2
9.BD.10HemimorphiteZn4Si2O7(OH)2 · H2O
9.BD.15JunitoiteCaZn2Si2O7 · H2O
9.BD.20Axinite-(Fe)Ca4Fe22+Al4[B2Si8O30](OH)2
9.BD.20Axinite-(Mg)Ca4Mg2Al4[B2Si8O30](OH)2
9.BD.20Axinite-(Mn)Ca4Mn22+Al4[B2Si8O30](OH)2
9.BD.20TinzeniteCa2Mn42+Al4[B2Si8O30](OH)2
9.BD.25VistepiteMn4SnB2O2(Si2O7)2(OH)2
9.BD.30BoralsiliteAl16B6O30(Si2O7)
17.5.1ManandoniteLi2Al4(Si2AlB)O10(OH)8
17.5.2ReedmergneriteNaBSi3O8
17.5.3SearlesiteNaBSi2O5(OH)2
17.5.4OleniteNaAl3Al6(Si6O18)(BO3)3(O3)OH
17.5.5ElbaiteNa(Al1.5Li1.5)Al6(Si6O18)(BO3)3(OH)3OH
17.5.6KalborsiteK6Al4BSi6O20(OH)4Cl
17.5.7BoromuscoviteKAl2(Si3B)O10(OH)2
17.5.8PoudretteiteKNa2(B3Si12)O30
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.10DatoliteCaB(SiO4)(OH)
17.5.11DanburiteCaB2Si2O8
17.5.12HowliteCa2B5SiO9(OH)5
17.5.13BakeriteCa4(H5B5Si3O20)
17.5.14OyeliteCa10B2Si8O29 · 12H2O
17.5.15Kornerupine(Mg,Fe2+,Al,◻)10(Si,Al,B)5O21(OH,F)
17.5.16HarkeriteCa12Mg4Al(SiO4)4(BO3)3(CO3)5 · H2O
17.5.17SerendibiteCa4(Mg6Al6)O4[Si6B3Al3O36]
17.5.18Stillwellite-(Ce)CeBSiO5
17.5.19Tadzhikite-(Ce)
17.5.20Melanocerite-(Ce)Ce5(SiO4,BO4)3(OH,O)
17.5.21Okanoganite-(Y)(Y,REE,Ca,Na,Th)16(Fe3+,Ti)(Si,B,P)10(O,OH)38F10
17.5.22Tritomite-(Ce)Ce5(SiO4,BO4)3(OH,O)
17.5.23Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
17.5.24Cappelenite-(Y)BaY6B6Si3O24F2
17.5.25DumortieriteAlAl6BSi3O18
17.5.26Holtite(Ta0.60.4)Al6BSi3O18
17.5.27DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3OH
17.5.28 FerridraviteNaFe33+(Mg2Fe43+)(Si6O18)(BO3)3(OH)3O
17.5.29Axinite-(Mg)Ca4Mg2Al4[B2Si8O30](OH)2
17.5.30Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
17.5.31GarrelsiteNaBa3B7Si2O16(OH)4
17.5.32TienshaniteK(Na,K,◻)9Ca2Ba6Mn62+Ti6B12Si36O114(O,OH,F)11
17.5.33LeucospheniteNa4BaTi2B2Si10O30
17.5.34TaramelliteBa4(Fe3+,Ti)4O2[B2Si8O27]Clx; x = 0 to 1
17.5.35TitantaramelliteBa4(Ti,Fe3+,Mg)4(O,OH)2[B2Si8O27]Clx
17.5.36NagashimaliteBa4(V3+,Ti)4(O,OH)2[B2Si8O27]Cl
17.5.37Chromium-draviteNa(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
17.5.38WawayandaiteCa6Be9Mn22+BSi6O23(OH,Cl)15
17.5.40Axinite-(Mn)Ca4Mn22+Al4[B2Si8O30](OH)2
17.5.41Axinite
17.5.42TinzeniteCa2Mn42+Al4[B2Si8O30](OH)2
17.5.44SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3OH
17.5.45Fluor-buergeriteNaFe33+Al6(Si6O18)(BO3)3O3F
17.5.46FeruviteCaFe32+(Al5Mg)(Si6O18)(BO3)3(OH)3OH
17.5.47Axinite-(Fe)Ca4Fe22+Al4[B2Si8O30](OH)2
17.5.48HomiliteCa2Fe2+B2(SiO4)2O2
17.5.49GrandidieriteMgAl3O2(BO3)SiO4
17.5.50Hyalotekite(Ba,Pb,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28F
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al(Be,Li)2-xB4Si4O22(OH)2

Other Names for Werdingite

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 Werdingite

Reference List:
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 Werdingite

mindat.org URL:
https://www.mindat.org/min-4270.html
Please feel free to link to this page.

Localities for Werdingite

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.
(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.
Antarctica
 
  • 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
Australia
 
  • Northern Territory
    • Central Desert Region
Am Min 93:283-299
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • Vysočina Region
      • Žďár nad Sázavou
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
Madagascar
 
  • Tuléar Province (Toliara)
    • Anosy Region (Fort Dauphin Region)
      • Taolañaro District (Fort Dauphin)
        • Ranopiso Commune
Grew, E. S. et al. (1998): Werdingite, a borosilicate new to granitic pegmatites, The Canadian Mineralogist 36, 399-414 + [AmMin 84:993]
Norway
 
  • 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 Province
    • 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.
Zimbabwe
 
  • Mashonaland West
MinMag 61:713 (1997)
Mineral and/or Locality  
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