Nenadkevichite Mineral Data + Say NENADKEVICHITE

General Nenadkevichite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O)
Help on Composition: Composition: Molecular Weight = 308.14 gm
   Potassium   0.76 %  K     0.92 % K2O
   Sodium      6.71 %  Na    9.05 % Na2O
   Calcium     0.39 %  Ca    0.55 % CaO
   Titanium    4.66 %  Ti    7.78 % TiO2
   Niobium    21.11 %  Nb   30.19 % Nb2O5
   Silicon    18.23 %  Si   39.00 % SiO2
   Hydrogen    1.41 %  H    12.57 % H2O
   Oxygen     46.73 %  O
             ______        ______ 
             100.00 %      100.05 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.9K0.06Ca0.03Nb0.7Ti0.3Si2O6.7(OH)0.3·2(H2O)
Help on Environment: Environment: Between crystals of microcline in a natrolite-albite-rich pegmatite in nepheline syenite in a differentiated alkalic massif.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1955 (Dana # Changed)
Help on Locality: Locality: Lovozero Massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Konstantin A. Nenadkevich, Russian mineralogist and geochemist.
Help on Synonym: Synonym: ICSD 2584
  Nenadkevichite - (60.1.3.1)
  PDF 25-1189
 

Nenadkevichite Image

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Nenadkevichite

Comments: Pinkish crystal of nenadkevichite on matrix.
Location: Monte St. Hilaire, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Nenadkevichite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5217:1:0.5034
Help on Cell Dimensions: Cell Dimensions: a = 7.408, b = 14.198, c = 7.148, Z = 4; V = 751.82 Den(Calc)= 2.72
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.099(1), 7.148(0.97), 6.568(0.65),
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Forms: [ 0 1 0] [ 1 1 0] [ 0 0 1]

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Rastsvetaeva R K , Tamazyan R A , Pushcharovsky D Y , Nadezhina T N , European Journal of Mineralogy , 6 (1994) p.503-509, Crystal structure and microtwinning of K-rich nenadkevichite, Note: Wat4 y-coordinate changed to reproduce reported bond lengths

 

Physical Properties of Nenadkevichite

Help on Cleavage: Cleavage: [001] Indistinct
Help on Color: Color: Brown, Brown, Rose, Yellow, Tan.
Help on Density: Density: 2.838 - 2.885, Average = 2.86
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: light pink
 

Optical Properties of Nenadkevichite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2539,KPDmeas= 0.2413,KC= 0.2555
Help on Optical Data: Optical Data: Biaxial (+), a=1.633-1.659, b=1.642-1.686, g=1.738-1.785, bire=0.1050-0.1260, 2V(Calc)=36-58, 2V(Meas)=31-45.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): pale yellow.
Help on Pleochroism (z): Pleochroism (z): pale rose.
 

Calculated Properties of Nenadkevichite

Help on Electron Density: Electron Density:

relectron=2.67 gm/cc
note: rNenadkevichite =2.72 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01477
Boson Index = 0.98523
Help on Photoelectric: Photoelectric:

PENenadkevichite = 32.14 barns/electron
U=PENenadkevichite x relectron= 85.82 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 10.80 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Nenadkevichite - barely detectable

 

Nenadkevichite Classification

Help on  Dana Class: Dana Class: 60.1.3a.1 (60)Cyclosilicate Four-Membered Rings
  (60.1)as Titanosilicates
  (60.1.3a)Labuntsovite Group (Nenadkevichite subgroup Orthorhombic [Pbam])
 
60.1.3a.1 Nenadkevichite ! (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) Pbam 2/m 2/m 2/m
 
60.1.3a.2 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O) Pbam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: VIII/E.07-20 VIII - Silicates
  VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-
  VIII/E.07 - Labuntsovite Group
 
VIII/E.07-10 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O) Pbam 2/m 2/m 2/m
 
VIII/E.07-20 Nenadkevichite (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) Pbam 2/m 2/m 2/m
 
VIII/E.07-30* Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m
 
VIII/E.07-30 Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O) Cm m
 
VIII/E.07-32 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O) Cm m
 
VIII/E.07-33 Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m
 
VIII/E.07-34 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m
 
VIII/E.07-40 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O) Cm m
 
VIII/E.07-50 Clinophosinaite! Na3CaPSiO7 P 2/c 2/m
 
VIII/E.07-50* Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8(H2O) Cm m
 
VIII/E.07-60* Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4·5(H2O) C 2/m 2/m
 
VIII/E.07-60 Phosinaite-(Ce)! Na13Ca2Ce[Si4O12](PO4)4 P 22121 2 2 2
 
VIII/E.07-70 Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(H2O) C 2/m 2/m
 
VIII/E.07-80 Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m
 
VIII/E.07-90 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m
 
VIII/E.07-100 Lemmleinite-K! NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O) C 2/m 2/m
 
VIII/E.07-110 Lemmleinite-Ba! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4·5(H2O) C 2/m 2/m
 
VIII/E.07-130 Paralabuntsovite-Mg! Na8K8Mg8Ti16(Si4O12)8(O,OH)16·n(H2O) I2/m 2/m
 
VIII/E.07-140 Labuntsovite-Mg! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m
 
VIII/E.07-150 Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m
 
VIII/E.07-155 Labuntsovite-Mn Na4K4(Ba,K)(Mn,Fe)1x(Ti,Nb)8[Si4O12]4(O,OH)8·n(H2O),n=10-12 I2/m 2/m
 
VIII/E.07-170 Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m
 
VIII/E.07-180 Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m
 
VIII/E.07-190 Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) Cm m
 
VIII/E.07-200 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5(H2O) Cm m
 
VIII/E.07-205 Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O) Cm m
 
VIII/E.07-210 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m
 
VIII/E.07-220 Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m
 

Other Nenadkevichite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Nenadkevichite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST 16 -École des Mines de Paris

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Nenadkevichite

(Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O)
Dana No: 60.1.3a.1 Strunz No: VIII/E.07-20
Locality:

 

Notes:

 

 
   
 
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