Chesnokovite Mineral Data

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General Chesnokovite Information

Chemical Formula:

Na2[SiO2(OH)2]•8H2O

Composition:

Molecular Weight = 277.56 gm

Potassium 0.28 % K 0.34 % K₂O

Sodium 16.57 % Na 22.33 % Na₂O

Silicon 10.17 % Si 21.76 % SiO₂

Hydrogen 6.23 % H 55.69 % H₂O

Oxygen 66.75 % O

______ ______

100.00 % 100.12 % = TOTAL OXIDE

Empirical Formula:

Na₂K_0.02(O)₂(OH)₂•7.58(H₂O)

Environment:

Found in an ussingite vein uncovered by underground mining where it occurs as intergrowths with natrophospate in pockets. New structure type. Alters to opal.

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Karnasurt mine, Mountain Kedykverpakhk, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for B.V. Chesnokov (1928-2005), an outstanding mineralogist.

Synonym:

IMA2006-007

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Chesnokovite Crystallography

Axial Ratios:

a:b:c =0.69:1:0.6813

Cell Dimensions:

a = 11.7119, b = 16.973, c = 11.5652, Z = 8; V = 2,299.00 Den(Calc)= 1.60

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: I bca

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

By Intensity(I/I_o): 2.774(1), 2.8(0.97), 3.847(0.89),2.832(0.42), 2.932(0.42), 4.788(0.42), 5.001(0.3), 2.035(0.2),

Crystal Structure:

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Pekova I V , Chukanov N V , Zadov A E , Zubkova N V , Pushcharovsky D Yu , Geology of Ore Deposits , 49 (2007) p.727-738, Chesnokovite, Na2[SiO2(OH)2]*8H2O, the first natural sodium orthosilicate from, the Lovozero alkaline pluton, Kola Peninsula: Description and crystal structure, of a new mineral species, Locality: Mt. Kedykverpakhk, Lovozero alkaline pluton, Kola Peninsula, Russia

Physical Properties of Chesnokovite

Cleavage:

{010} Perfect, {100} Distinct, {001} Distinct

Color:

Colorless, White, Pale brownish yellow.

Density:

1.68

Diaphaneity:

Transparent

Fracture:

Stepped - Fracture surfaces resemble stair case steps

Habit:

Deliquescent - Crystals absorb water from the air and melt or otherwise deteriorate.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Chesnokovite

Gladstone-Dale:

CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2833,KPDmeas= 0.2698,KC= 0.2777
Ncalc = 1.44 - 1.47

Optical Data:

Biaxial (+), a=1.449, b=1.453, g=1.458, bire=0.0090

Calculated Properties of Chesnokovite

Electron Density:

Bulk Density (Electron Density)=1.69 gm/cc
note: Specific Gravity of Chesnokovite =1.60 gm/cc.

Fermion Index:

Fermion Index = 0.0050792144
Boson Index = 0.9949207856

Photoelectric:

PE_Chesnokovite= 0.84 barns/electron
U=PE_Chesnokovite x r_electron= 1.42 barns/cc.

Radioactivity:

GRapi = 4.27 (Gamma Ray American Petroleum Institute Units)
Concentration of Chesnokovite per GRapi unit = 23.44 (%)

Estimated Radioactivity from Chesnokovite - barely detectable

Chesnokovite Classification

Dana Class:

78.07.14.02 (78)Unclassified silicates

(78.07)wholly unclassified silicates

(78.07.14)Dana Group

78.07.14.01 Spadaite MgSiO2(OH)2•(H2O)(?) Ortho

78.07.14.02 Chesnokovite! Na2[SiO2(OH)2]•8H2O I bca 2/m 2/m 2/m

Strunz Class:

09.AC.20 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AC -Nesosilicates without additional anions;

09.AC.20 Chesnokovite! Na2[SiO2(OH)2]•8H2O I bca 2/m 2/m 2/m

Other Chesnokovite Information

References:

NAME( Geology of Ore Deposits v49:727) PHYS. PROP.(Geology of Ore Deposits v49:727) OPTIC PROP.(Geology of Ore Deposits v49:727)

See Also:

Links to other databases for Chesnokovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Chesnokovite

Na2[SiO2(OH)2]•8H2O
Dana No: 78.07.14.02 Strunz No: 09.AC.20
Locality:

Notes: