Chkalovite Mineral Data

General Chkalovite Information

Chemical Formula:

Na2BeSi2O6

Composition:

Molecular Weight = 207.16 gm

Sodium 22.20 % Na 29.92 % Na₂O

Beryllium 4.35 % Be 12.07 % BeO

Silicon 27.11 % Si 58.01 % SiO₂

Oxygen 46.34 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Be(Si₂O₆)

Environment:

In veins in pegmatite in a differentiated alkalic massif.

IMA Status:

Valid Species (Pre-IMA) 1939

Locality:

Mt. Punkaruaiv, Lovozero massif, and in the Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Valerii Pavlovich Chkalov (1904{1938), the first to fly nonstop from Moscow to the USA across the North Pole.

Synonym:

ICSD 34075

PDF 42-572

Chkalovite Image

Images:

Chkalovite

Comments: Massive, white chkalovite associated with dark aegerine.
Location: Ilimaussaq, Tasseq, Greenland. Scale: 4.5 x 3 cm.
© John Veevaert

Chkalovite Crystallography

Axial Ratios:

a:b:c =1:1:0.3255

Cell Dimensions:

a = 21.1, b = 21.1, c = 6.87, Z = 24; V = 3,058.59 Den(Calc)= 2.70

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: F dd2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.48(1), 4.02(1), 2.76(0.9),

Physical Properties of Chkalovite

Cleavage:

{100} Fair, {0kl} Indistinct

Color:

Colorless, White.

Density:

2.662

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Equant Grains - Granular material with equel dimensions in x, y, and z.

Hardness:

6 - Orthoclase

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Chkalovite

Gladstone-Dale:

CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2023,KPDmeas= 0.2052,KC= 0.2065
Ncalc = 1.55 - 1.56

Optical Data:

Biaxial (+), a=1.544, b=1.546, g=1.549, bire=0.0050, 2V(Calc)=80, 2V(Meas)=78.

Calculated Properties of Chkalovite

Electron Density:

Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Chkalovite =2.66 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Chkalovite= 1.43 barns/electron
U=PE_Chkalovite x rElectron Density= 3.75 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chkalovite is Not Radioactive

Chkalovite Classification

Dana Class:

65.05.02.01 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.05)with chains P=6

(65.05.02)Dana Group

65.05.02.01 Chkalovite Na2BeSi2O6 F dd2 mm2

Strunz Class:

09.DM.20 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DM -Inosilicates with 6-periodic single chains

09.DM.20 Chkalovite Na2BeSi2O6 F dd2 mm2

Other Chkalovite Information

References:

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

See Also:

Links to other databases for Chkalovite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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

Chkalovite

Na2BeSi2O6
Dana No: 65.05.02.01 Strunz No: 09.DM.20
Locality:

Notes:

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