Nenadkevichite Mineral Data

Advertisment

Our Mission is Simple: RMS will be the go-to portal for all Mineral, Gem and Rock shows in the USA

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:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

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

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Nenadkevichite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Nenadkevichite :

A Bijoux Google Search for Nenadkevichite
Adam's Minerals Google Search for Nenadkevichite
Cape Minerals Google Search for Nenadkevichite
Dakota Matrix Minerals Google Search for Nenadkevichite
Excalibur Mineral Corp. Google Search for Nenadkevichite
Exceptional Minerals Google Search for Nenadkevichite
John Betts Fine Minerals Search for Nenadkevichite
McDougall Minerals Google Search for Nenadkevichite
Mineral News Website Link
Rock and Mineral Shows Google Search for Nenadkevichite
Weinrich Minerals, Inc. Google Search for Nenadkevichite

Ask about Nenadkevichite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: