Nenadkevichite Mineral Data

General Nenadkevichite Information

Chemical Formula:

(Na,Ca,K)(Nb,Ti)Si2O6(O,OH)•2(H2O)

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

Empirical Formula:

Na_0.9K_0.06Ca_0.03Nb_0.7Ti_0.3Si₂O_6.7(OH)_0.3•2(H₂O)

Environment:

Between crystals of microcline in a natrolite-albite-rich pegmatite in nepheline syenite in a differentiated alkalic massif.

IMA Status:

Valid Species (Pre-IMA) 1955 (Dana # Changed from 60.1.3.1)

Locality:

Lovozero Massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Konstantin A. Nenadkevich, Russian mineralogist and geochemist.

Name Pronunciation:

Nenadkevichite + Pronunciation

Synonym:

ICSD 2584

Nenadkevichite - (60.1.3.1)

PDF 25-1189

Nenadkevichite Image

Images:

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

Axial Ratios:

a:b:c =0.5217:1:0.5034

Cell Dimensions:

a = 7.408, b = 14.198, c = 7.148, Z = 4; V = 751.82 Den(Calc)= 2.72

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/I_o): 7.099(1), 7.148(0.97), 6.568(0.65),

Forms:

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Forms: ( 0 1 0) ( 1 1 0) ( 0 0 1)

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Crystal Structure:

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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

Cleavage:

{001} Indistinct

Color:

Brown, Brown, Rose, Yellow, Tan.

Density:

2.838 - 2.885, Average = 2.86

Diaphaneity:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

5 - Apatite

Luster:

Earthy (Dull)

Streak:

light pink

Optical Properties of Nenadkevichite

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

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.

Pleochroism (x):

colorless.

Pleochroism (y):

pale yellow.

Pleochroism (z):

pale rose.

Calculated Properties of Nenadkevichite

Electron Density:

Bulk Density (Electron Density)=2.67 gm/cc
note: Specific Gravity of Nenadkevichite =2.72 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Nenadkevichite}= 32.14 barns/electron
U=PE_{Nenadkevichite} x r_electron= 85.82 barns/cc.

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

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Print or Cut-and-Paste your Nenadkevichite Specimen Label here :

Nenadkevichite

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

Notes: