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(Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O
Rose-pink, very light ...
Vitreous, Dull
After Konstantin Avtonomovich Nenadkevich [May 21 or June 2, 1880 Kashevka, now Kovel' Raion, Volyn' Oblast, Russia - June 19, 19633 Moscow, Russia] Russian mineralogist and geochemist, A.E. Fersman Mineralogical Museum, Moscow, Russia.

Classification of Nenadkevichite

Approved, 'Grandfathered' (first described prior to 1959)

9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions

60 : CYCLOSILICATES Four-Membered Rings
1 : Four-Membered Rings, as Titanosilicates

17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate

Physical Properties of Nenadkevichite

Vitreous, Dull
Diaphaneity (Transparency):
Transparent, Translucent, Opaque
Rose-pink, very light pink, light yellow, brown; dark brown due to inclusions
White, very light rose-pink
Hardness (Mohs):
On {001}
2.78 - 2.885 g/cm3 (Measured)    2.7 g/cm3 (Calculated)

Optical Data of Nenadkevichite

Biaxial (+)
RI values:
nα = 1.633 - 1.659 nβ = 1.642 - 1.686 nγ = 1.738 - 1.785
Measured: 31° to 45°, Calculated: 36° to 58°
Max Birefringence:
δ = 0.105 - 0.126
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
r > v strong
X = colourless
Y = Light yellow
Z = Light rose-pink

Chemical Properties of Nenadkevichite

(Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O
Idealised Formula:
(Na,Ca)(Nb,Ti)Si2O7 · 2H2O
Elements listed in formula:
Common Impurities:

Crystallography of Nenadkevichite

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cell Parameters:
a = 7.408 Å, b = 14.198 Å, c = 7.148 Å
a:b:c = 0.522 : 1 : 0.503
Unit Cell Volume:
V 751.82 ų (Calculated from Unit Cell)
Crystals equant or bladed pseudohexagonal prisms. Foliated segregations and lamellar mases.
X-Ray Powder Diffraction Data:
3.20 (100)
3.10 (100)
1.427 (100)
1.289 (90)
2.49 (80)
2.58 (70)
1.705 (70)
Lovozero massif material.

Type Occurrence of Nenadkevichite

Geological Setting of Type Material:
Natrolite-albite-rich pegmatite in nepheline syenite in a differentiated alkalic massif.
Associated Minerals at Type Locality:

Relationship of Nenadkevichite to other Species

Other Members of Group:
KorobitsyniteNa2(Ti,Nb)2(Si4O12)(OH,O)2 · 3-4H2O
Unnamed (Ca-Na-ordered analogue of Korobitsynite)(Ca,Na)2(Ti,Nb)2(Si4O12)(OH,O)2 · 3-4H2O
9.CE.20TaramelliteBa4(Fe3+,Ti)4O2[B2Si8O27]Clx; x = 0 to 1
9.CE.25Bario-orthojoaquiniteBa4Fe22+Ti2O2(SiO3)8 · H2O
9.CE.25Byelorussite-(Ce)NaBa2Ce2Mn2+Ti2Si8O26(F,OH) · H2O
9.CE.25Joaquinite-(Ce)NaBa2Fe2+Ti2Ce2(SiO3)8O2(OH) · H2O
9.CE.25Orthojoaquinite-(Ce)NaBa2Fe2+Ce2Ti2(SiO3)8O2(O,OH) · H2O
9.CE.25Strontiojoaquinite(Na,Fe)2Ba2Sr2Ti2(SiO3)8(O,OH)2 · H2O
9.CE.25Orthojoaquinite-(La)NaBa2La2Fe2+Ti2Si8O26(OH,O,F) · H2O
9.CE.30eLabuntsovite-MnNa4K4Mn22+Ti8O4(Si4O12)4(OH)4 · 10-12H2O
9.CE.30dLemmleinite-KNa4K8Ti8(Si4O12)4(O,OH)8 · 8H2O
9.CE.30aKorobitsynite(Na,◻)8Ti4(Si4O12)2(O,OH)4 · 8H2O
9.CE.30cKuzmenkoite-MnK4Mn2Ti8(Si4O12)4(OH,O)8 · 10-12H2O
9.CE.30bVuoriyarvite-K(K,Na,◻)12Nb8(Si4O12)4O8 · 12-16H2O
9.CE.30bTsepinite-Na(Na,H3O,K,Sr,Ba,◻)12Ti8(Si4O12)4(OH,O)8 · 12-16H2O
9.CE.30cKarupmøllerite-Ca(Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 7H2O
9.CE.30eLabuntsovite-MgNa4K4Mg2Ti8O4(Si4O12)4(OH)4 · 10-12H2O
9.CE.30eLabuntsovite-FeNa4K4Fe22+Ti8(Si4O12)4(O,OH)8 · 10-12H2O
9.CE.30dLemmleinite-BaNa4K4Ba2+xTi8(Si4O12)4(O,OH)8 · 8H2O
9.CE.30cGjerdingenite-FeK2Fe(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O
9.CE.30hNeskevaaraite-FeNaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4 · 6H2O
9.CE.30bTsepinite-K(K,Ba,Na)2(Ti,Nb)2Si4O12(OH,O)2 · 3H2O
9.CE.30bParatsepinite-Ba(Ba,Na,K)2-x(Ti,Nb)2Si4O12(OH,O)2 · 4H2O
9.CE.30bTsepinite-Ca(Ca,K,Na)2-x(Ti,Nb)2Si4O12(OH,O)2 · 4H2O
9.CE.30hAlsakharovite-ZnNaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O
9.CE.30cGjerdingenite-MnK2Mn(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O
9.CE.30cLepkhenelmite-ZnBa2Zn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O
9.CE.30bTsepinite-Sr(Sr,Ba,K)(Ti,Nb)2Si4O12(OH,O)2 · 3H2O
9.CE.30bParatsepinite-Na(Na,Sr,K,Ca)2(Ti,Nb)2(Si4O12)(O,OH)2 · 4H2O
9.CE.30fParalabuntsovite-MgNa8K8Mg4Ti16(Si4O12)8(O,OH)16 · 20-24H2O
9.CE.30cGjerdingenite-CaK2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O
9.CE.30cGjerdingenite-Na(K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4 · 5H2O
9.CE.30hGutkovaite-MnCaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2O
9.CE.30cKuzmenkoite-ZnK2ZnTi4(Si4O12)2(OH)4 · 6-8H2O
9.CE.30gOrganovaite-MnK2MnNb4(Si4O12)2O4 · 5-7H2O
9.CE.30gOrganovaite-ZnK2Zn(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O
9.CE.30gParakuzmenkoite-Fe(K,Ba)8Fe4Ti16(Si4O12)8(OH,O)16 · 20-28H2O
9.CE.30cBurovaite-Ca(Na,K)4Ca2(Ti,Nb)8[Si4O12]4(OH,O)8 · 12H2O
9.CE.45Komarovite(Ca,Sr,Na)6-x(Nb,Ti)6(Si4O12)(O,OH,F)16 · nH2O
9.CE.45Natrokomarovite(Na,Ca,H)2Nb2Si2O10(OH,F)2 · H2O
17.8.5MongoliteCa4Nb6Si5O24(OH)10 · 6H2O
17.8.9Natrokomarovite(Na,Ca,H)2Nb2Si2O10(OH,F)2 · H2O
17.8.15Komarovite(Ca,Sr,Na)6-x(Nb,Ti)6(Si4O12)(O,OH,F)16 · nH2O
17.8.16ManganbelyankiniteMn2+(Ti,Nb)5O12 · 9H2O

Other Names for Nenadkevichite

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 Nenadkevichite

Reference List:
Kuz'menko, M.V., and Kazakova, M.E. (1955) Nenadkevichite - anew mineral.Doklady Akademii Nauk SSSR: 100: 1159-1160 (in Russian).

American Mineralogist (1955): 40: 1154 (abstract).

Vlasov, K.A., editor (1966) Mineralogy of rare elements, volume II: 547-549.

Perrault, G., Boucher, C., and Vicat, J. (1973) Structure cristalline du nenadkevichite (Na,K)2-x(Nb,Ti)(O,OH)Si2O6·2H2O. Acta Crystallographica: B29: 1432-1438 (in French with English abstracts).

Mandarino, J.A. and Anderson, V. (1989) Monteregian Treasures Cambridge University Press: 155.

Canadian Mineralogist (1999): 901-910.

European Journal of Mineralogist (2002): 14: 165-173.

Internet Links for Nenadkevichite URL:
Please feel free to link to this page.

Localities for Nenadkevichite

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.
  • Minas Gerais
    • Coromandel district
      • Bagagem River valley
Traversa, G., Gomes, C. B., Brotzu, P., Buraglini, N., Morbidelli, L., Principato, M. S., ... & Ruberti, E. (2001). Petrography and mineral chemistry of carbonatites and mica-rich rocks from the Araxá complex (Alto Paranaíba Province, Brazil). Anais da Academia Brasileira de Ciências, 73(1), 71-98.
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359., AmMin 40:1154(1955)
      • Lajemmerais RCM
        • Varennes & St-Amable
HORVÁTH, L., PFENNINGER HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83 118.
Horváth, L., Pfenninger-Horváth, E., Gault, R. A., & Tarassoff, P. (1998): Mineralogy of the Saint-Amable Sill, Varennes and Saint-Amable, Québec. Mineralogical Record, 29: 83-118.
  • Liaoning Province (Manchuria; Dongbei Region)
    • Dandong Prefecture
      • Fengcheng Co.
        • Saima complex
Saima Deposit Research Group, Beijing Institute of Uranium Geology (1978): Scientia Sinica 11(3), 365-389
  • Kujalleq
    • Narsaq
      • Igaliku (Igaliko)
        • Narsaarsuk Plateau
Petersen, O.V (1995): Alkaline mineralforekomster i syd og syd-vest Grønland. Bergverksmuseets Skrift 9,7-17
Soerensen, H. (2001): The Ilimaussaq alkaline complex, South Greenland: status of mineralogical research with new results, Geology of Greenland Survey Bulletin 190, GEUS; Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
  • Khomas Region
    • Windhoek District
      • Aris
Uwe Kolitsch (single-crystal X-ray diffraction); Petersen et al.: Mineralienwelt 15(2): 44-48 (2004); Kolitsch, U., Blaß, G., Jahn, S., Cámara, F., von Bezing, L., Wartha, R. R., Tremmel, G., Sturla, M., Cerea, P., Skebo, M. and Ciriotti, M. E. (2016): Aris - mineralogy of the famous alkaline phonolite. AMI - Associazione Micromineralogica Italiana, Cremona, Italy, 95 pp.
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
          • Kukisvumchorr Mt
Lapis 28(12), 46-47 (2003); Cámara, F., Sokolova, E., Abdu, Y. A., & Hawthorne, F. C. (2014). Saamite, Ba□ Tinbna3ti (Si2o7) 2o2 (Oh) 2 (H2o) 2, a Group-iii Ti-disilicate Mineral from the Khibiny Alkaline Massif, Kola Peninsula, Russia: Description and Crystal Structure. The Canadian Mineralogist, 52(4), 745-762.
Pekov, I. et al (2003): New Data on Minerals: 38: 20-33.
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
        • Lovozero Massif
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
            • Umbozero mine (Umbozerskii mine; Umba Mine)
Pekov, I.V. (2000): Lovozero Massif. Moscow, Ocean Pictures Ltd, 480 pp.
Arzamastsev, A., Yakovenchuk, V., Pakhomovsky, Y., & Ivanyuk, G. (2008). The Khibina and Lovozero alkaline massifs: Geology and unique mineralization. In Guidbook for 33rd International Geological Congress Excursion (No. 47, p. 58).
            • Karnasurt underground mine
              • Karnasurt area
Pluth, J. J., Smith, J. V., Pushcharovsky, D. Y., Semenov, E. I., Bram, A., Riekel, C., ... & Broach, R. W. (1997). Third-generation synchrotron x-ray diffraction of 6-μm crystal of raite,≈ Na3Mn3Ti0. 25Si8O20 (OH) 2⋅ 10H2O, opens up new chemistry and physics of low-temperature minerals. Proceedings of the National Academy of Sciences, 94(23), 12263-12267.
I. Pekov (1998) Minerals First Discovered on the Territory of the former Soviey Union
[World of Stones 95:5-6, p64]
      • Northern Karelia
        • Vuoriyarvi alkaline-ultrabasic massif
Lapis 28(12), 47 (2003)
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
New Data on Minerals (2004): 39: 50-64
  • Arkansas
    • Hot Spring Co.
      • Magnet Cove
Henry Barwood - unpublished (2010)
  • Virginia
Minerals of Virginia 1990 by R. V. Dietrich
Minerals of Virginia 1990 by R. V. Dietrich
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