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Nenadkevichite

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Formula:
(Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O
Colour:
Rose-pink, very light pink, light yellow, brown; dark brown due to inclusions
Lustre:
Vitreous, Dull
Hardness:
5
Specific Gravity:
2.78 - 2.885
Crystal System:
Orthorhombic
Name:
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.
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Classification of NenadkevichiteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.CE.30a

9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
60.1.3.1

60 : CYCLOSILICATES Four-Membered Rings
1 : Four-Membered Rings, as Titanosilicates
17.8.8

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

Physical Properties of NenadkevichiteHide

Vitreous, Dull
Transparency:
Transparent, Translucent, Opaque
Colour:
Rose-pink, very light pink, light yellow, brown; dark brown due to inclusions
Streak:
White, very light rose-pink
Hardness:
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
On {001}
Fracture:
Irregular/Uneven
Density:
2.78 - 2.885 g/cm3 (Measured)    2.7 g/cm3 (Calculated)

Optical Data of NenadkevichiteHide

Type:
Biaxial (+)
RI values:
nα = 1.633 - 1.659 nβ = 1.642 - 1.686 nγ = 1.738 - 1.785
2V:
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:
Moderate
Dispersion:
r > v strong
Pleochroism:
Weak
Comments:
X = colourless
Y = Light yellow
Z = Light rose-pink

Chemical Properties of NenadkevichiteHide

Formula:
(Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O
Idealised Formula:
(Na,Ca)(Nb,Ti)Si2O7 · 2H2O
Common Impurities:
Al,TR,Fe,Mn,Mg,Ba

Crystallography of NenadkevichiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbam
Cell Parameters:
a = 7.408 Å, b = 14.198 Å, c = 7.148 Å
Ratio:
a:b:c = 0.522 : 1 : 0.503
Unit Cell V:
751.82 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals equant or bladed pseudohexagonal prisms. Foliated segregations and lamellar mases.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.20 (100)
3.10 (100)
1.427 (100)
1.289 (90)
2.49 (80)
2.58 (70)
1.705 (70)
Comments:
Lovozero massif material.

Type Occurrence of NenadkevichiteHide

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

Other Language Names for NenadkevichiteHide

Relationship of Nenadkevichite to other SpeciesHide

Other Members of this group:
KorobitsyniteNa2(Ti,Nb)2(Si4O12)(OH,O)2 · 3-4H2OOrth. mmm (2/m 2/m 2/m) : Pbam
Unnamed (Ca-Na-ordered analogue of Korobitsynite)(Ca,Na)2(Ti,Nb)2(Si4O12)(OH,O)2 · 3-4H2O

Common AssociatesHide

Associated Minerals Based on Photo Data:
Rhodochrosite15 photos of Nenadkevichite associated with Rhodochrosite on mindat.org.
Elpidite10 photos of Nenadkevichite associated with Elpidite on mindat.org.
Aegirine9 photos of Nenadkevichite associated with Aegirine on mindat.org.
Epididymite8 photos of Nenadkevichite associated with Epididymite on mindat.org.
Albite5 photos of Nenadkevichite associated with Albite on mindat.org.
Microcline4 photos of Nenadkevichite associated with Microcline on mindat.org.
Ancylite3 photos of Nenadkevichite associated with Ancylite on mindat.org.
Serandite3 photos of Nenadkevichite associated with Serandite on mindat.org.
Ancylite-(Ce)3 photos of Nenadkevichite associated with Ancylite-(Ce) on mindat.org.
Astrophyllite-Kupletskite Series3 photos of Nenadkevichite associated with Astrophyllite-Kupletskite Series on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.CE.05PapagoiteCaCu[H3AlSi2O9]Mon.
9.CE.10VerplanckiteBa2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2 · 3H2O or nearHex.
9.CE.15BaotiteBa4(Ti,Nb)8Si4O28ClTet. 4/m : I41/a
9.CE.20NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
9.CE.20TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2ClxOrth. mmm (2/m 2/m 2/m) : Pmmn
9.CE.20TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2ClxOrth.
9.CE.25Bario-orthojoaquinite(Ba,Sr)4Fe2Ti2[Si4O12]2O2 · H2OOrth.
9.CE.25Byelorussite-(Ce)NaBa2Ce2MnTi2[Si4O12]2O2(F,OH) · H2O
9.CE.25Joaquinite-(Ce)NaBa2Ce2FeTi2[Si4O12]2O2(OH,F) · H2OMon. 2 : B2
9.CE.25Orthojoaquinite-(Ce)NaBa2Ce2FeTi2[Si4O12]2O2(O,OH) · H2O
9.CE.25StrontiojoaquiniteSr2Ba2(Na,Fe)2Ti2[Si4O12]2O2(O,OH)2 · H2OMon.
9.CE.25Strontio-orthojoaquinite(Na,Fe)2Sr2Ba2Ti2[Si4O12]2O2(O,OH)2 · H2OOrth.
9.CE.25Orthojoaquinite-(La)NaBa2La2Fe2+Ti2[Si4O12]2O2(O,OH) · H2OOrth.
9.CE.30eLabuntsovite-MnNa4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2OMon.
9.CE.30dLemmleinite-KK2(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2OOrth.
9.CE.30aKorobitsyniteNa2(Ti,Nb)2(Si4O12)(OH,O)2 · 3-4H2OOrth. mmm (2/m 2/m 2/m) : Pbam
9.CE.30cKuzmenkoite-MnK2Mn2+(Ti,Nb)4(Si4O12)2(OH,O)4 · 5-6H2OMon.
9.CE.30bVuoriyarvite-KK2(Nb,Ti)2(Si4O12)(O,OH)2 · 4H2OMon.
9.CE.30bTsepinite-NaNa2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2OMon.
9.CE.30cKarupmøllerite-Ca(Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 7H2O
9.CE.30eLabuntsovite-MgNa4K4(Ba,K)2Mg(Ti,Nb)8(Si4O12)4(O,OH)8 · 10H2OMon.
9.CE.30eLabuntsovite-FeNa4K4(Ba,K)2Fe2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10H2OMon.
9.CE.30dLemmleinite-BaNa2K2Ba(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2OMon. 2/m : B2/m
9.CE.30cGjerdingenite-FeK2Fe2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2OMon. 2/m : B2/m
9.CE.30hNeskevaaraite-FeK3Na2Fe2+(Ti,Nb)4(Si4O12)2(O,OH)4 · 5-6 H2OMon. m : Bm
9.CE.30bTsepinite-KK2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2OMon. 2/m : B2/m
9.CE.30bParatsepinite-BaBa4(Ti,Nb)8(Si4O12)4(OH,O)8 · 8H2O
9.CE.30bTsepinite-CaCa(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2OMon. 2/m : B2/m
9.CE.30hAlsakharovite-ZnNaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2OMon. m : Bm
9.CE.30cGjerdingenite-MnK2Mn2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2OMon. 2/m : B2/m
9.CE.30cLepkhenelmite-Zn(Ba,K)2Zn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2OMon. m : Bm
9.CE.30bTsepinite-SrSr(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2OMon. m : Bm
9.CE.30bParatsepinite-Na(Na,Sr,K,Ca)7(Ti,Nb)8(Si4O12)4(O,OH)8·nH2O n ~ 8Mon. 2/m : B2/m
9.CE.30fParalabuntsovite-MgNa8K8Mg4Ti16(Si4O12)8(OH,O)16 · 20-24H2OMon. 2/m
9.CE.30cGjerdingenite-CaK2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2OMon. 2/m : B2/m
9.CE.30cGjerdingenite-NaK2Na(Nb,Ti)4(Si4O12)2(OH,O)4 · 5H2OMon. 2/m : B2/m
9.CE.30hGutkovaite-MnK2CaMn(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2OMon.
9.CE.30cKuzmenkoite-ZnK2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8H2OMon. m : Bm
9.CE.30gOrganovaite-MnK2Mn(Nb,Ti)4(Si4O12)2(O,OH)4 · 5-7H2OMon. 2/m : B2/m
9.CE.30gOrganovaite-ZnK2Zn(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O
9.CE.30gParakuzmenkoite-Fe(K,Ba)4Fe(Ti,Nb)8(Si4O12)4(O,OH)8 · 14H2OMon. 2/m : B2/m
9.CE.30cBurovaite-Ca(Na,K)4Ca2(Ti,Nb)8(Si4O12)4(OH,O)8 · 12H2OMon. 2/m : B2/m
9.CE.45Komarovite(Ca,Mn)Nb2[O3|Si2O7] · 3.5H2OOrth.
9.CE.45Natrokomarovite(Na,Ca,H)2Nb2Si2O10(OH,F)2 · H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.8.1EpistoliteNa2(Nb,Ti)2(Si2O7)O2 · nH2OTric.
17.8.2MurmaniteNa2Ti2(Si2O7)O2 · 2H2OTric.
17.8.3PerraultiteBaNaMn2+4Ti2(Si2O7)2O2(OH)2FMon. 2/m : B2/m
17.8.4Niocalite(Ca,Nb)4(Si2O7)(O,OH,F)2Mon.
17.8.5MongoliteCa4Nb6Si5O24(OH)10 · nH2OTet.
17.8.6FersmaniteCa4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3Tric.
17.8.7Nacareniobsite-(Ce)NbNa3Ca3(Ce,REE )(Si2O7)2OF3Mon.
17.8.9Natrokomarovite(Na,Ca,H)2Nb2Si2O10(OH,F)2 · H2OOrth.
17.8.10WöhleriteNaCa2(Zr,Nb)(Si2O7)(O,OH,F)2Mon. 2 : P21
17.8.11BelkoviteBa3(Nb,Ti)6(Si2O7)2O12Hex.
17.8.12BaotiteBa4(Ti,Nb)8Si4O28ClTet. 4/m : I41/a
17.8.13Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2Orth.
17.8.14Ilímaussite-(Ce)(Na,K)7-8(Ba,K)10Ce5(Nb,Ti)6(Si3O9)4(Si9O18)O6(O,OH)24Trig. 3 2 : R3 2
17.8.15Komarovite(Ca,Mn)Nb2[O3|Si2O7] · 3.5H2OOrth.
17.8.16Manganbelyankinite(Mn,Ca)(Ti,Nb)5O12 · 9H2O
17.8.17Niobophyllite(K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31Tric.
17.8.18Caesium-Kupletskite(Cs,K,Na)3(Mn,Fe2+)7(Ti,Nb)2Si8O24(O,OH,F)7

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 NenadkevichiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 NenadkevichiteHide

Localities for NenadkevichiteHide

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.
Brazil
 
  • Minas Gerais
    • Araxá
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.
Canada
 
  • 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.
China
 
  • 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
Greenland
 
  • 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
Namibia
 
  • 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.
Russia
 
  • 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.
http://maurice.strahlen.org/kola/khibiny.htm
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
USA
 
  • 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
Mineral and/or Locality  
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