Nenadkevichite Mineral Data

Nenadkevichite Mineral Data
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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 from 60.1.3.1)
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 Name Pronunciation: Name Pronunciation: Nenadkevichite + Pronunciation Say NENADKEVICHITE
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),
Help on Forms: Forms:

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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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.69 - 1.74
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: Bulk Density (Electron Density)=2.67 gm/cc
note: Specific Gravity of Nenadkevichite =2.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
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)
Concentration of Nenadkevichite per GRapi unit = 9.26 (%)

Estimated Radioactivity from Nenadkevichite - barely detectable

 

Nenadkevichite Classification
Help on Dana Class: Dana Class: 60.01.03a.01 (60)Cyclosilicate Four-Membered Rings
  (60.01)as Titanosilicates
  (60.01.03a)Labuntsovite Group (Nenadkevichite subgroup Orthorhombic [Pbam])
 
60.01.03a.01 Nenadkevichite! (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)•2(H2O) Pbam 2/m 2/m 2/m
 
60.01.03a.02 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: 09.CE.30a 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),
 
09.CE.30a Nenadkevichite (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)•2(H2O) Pbam 2/m 2/m 2/m
 
09.CE.30a Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2•3-4(H2O) Pbam 2/m 2/m 2/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 - Ecole des Mines de Paris
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Nenadkevichite

(Na,Ca,K)(Nb,Ti)Si2O6(O,OH)•2(H2O)
Dana No: 60.01.03a.01 Strunz No: 09.CE.30a
Locality:

 

Notes: