Nabokoite Mineral Data

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General Nabokoite Information

Chemical Formula:

Cu++7Te++++O4(SO4)5•KCl

Composition:

Molecular Weight = 1,191.29 gm

Potassium 3.28 % K 3.95 % K₂O

Copper 37.34 % Cu 46.74 % CuO

Tellurium 10.71 % Te 13.40 % TeO₂

Sulfur 13.46 % S 33.60 % SO₃

Chlorine 2.98 % Cl 2.98 % Cl

- % Cl -0.67 % -O=Cl₂

Oxygen 32.23 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₇TeO₄(SO₄)₅KCl

Environment:

Sublimate on porous basalt near a fumarole. Needs further study.

IMA Status:

Approved IMA 1987

Locality:

Great Clefted Tolbachik eruption, Kamchatka, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Sof'ya I. Naboko (1901-), Russian volcanologist.

Name Pronunciation:

Nabokoite + Pronunciation

Synonym:

ICSD 68186

PDF 42-1337

Nabokoite Image

Images:

Nabokoite

Comments: Brown thin tabular plates, co-type material.
Location: Tolbachik Volcano, Kamchatka, Russia. Scale: See Image.
© Rruff Database

Nabokoite Crystallography

Axial Ratios:

a:c = 1:2.08536

Cell Dimensions:

a = 9.84, c = 20.52, Z = 4; V = 1,986.86 Den(Calc)= 3.98

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/ncc

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

By Intensity(I/I_o): 10.35(1), 2.439(0.7), 3.421(0.6),

Crystal Structure:

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Pertlik F , Zemann J , Mineralogy and Petrology , 38 (1988) p.291-298, The crystal structure of nabokoite, Cu7TeO4(SO4)5*KCl:, The first example of a Te(IV)O4 pyramid with exactly tetragonal symmetry, Locality: Mount Tolbachik, Kamchatka, USSR

Physical Properties of Nabokoite

Cleavage:

{001} Perfect

Color:

Yellow, Yellow brown.

Density:

4.18

Diaphaneity:

Transparent

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Vitreous (Glassy)

Streak:

yellowish brown

Optical Properties of Nabokoite

Gladstone-Dale:

CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.065 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1948,KPDmeas= 0.1855,KC= 0.183
Ncalc = 1.73 - 1.77

Optical Data:

Uniaxial (-), e=1.773, w=1.778, bire=0.0050.

Calculated Properties of Nabokoite

Electron Density:

Bulk Density (Electron Density)=3.95 gm/cc
note: Specific Gravity of Nabokoite =4.18 gm/cc.

Fermion Index:

Fermion Index = 0.0097262073
Boson Index = 0.9902737927

Photoelectric:

PE_Nabokoite= 52.80 barns/electron
U=PE_Nabokoite x r_electron= 208.60 barns/cc.

Radioactivity:

GRapi = 44.74 (Gamma Ray American Petroleum Institute Units)
Concentration of Nabokoite per GRapi unit = 2.24 (%)

Estimated Radioactivity from Nabokoite - barely detectable

Nabokoite Classification

Dana Class:

30.01.17.01 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.01)where (A B)m (XO4)p Zq where m:p>2:1

(30.01.17)Dana Group

30.01.17.01 Nabokoite Cu7TeO4(SO4)5•KCl P 4/ncc 4/m 2/m 2/m

30.01.17.02 Atlasovite Cu6FeBiO4(SO4)5•KCl P 4/ncc 4/m 2/m 2/m

Strunz Class:

07.BC.20 07 - SULFATES (SELENATES, TELLURATES)

07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O

07.BC -With medium-sized and large cations

07.BC.20 Atlasovite Cu6FeBiO4(SO4)5•KCl P 4/ncc 4/m 2/m 2/m

07.BC.20 Nabokoite Cu7TeO4(SO4)5•KCl P 4/ncc 4/m 2/m 2/m

Other Nabokoite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.73,p929,1988) OPTIC PROP.(Am.Min.,Vol.73,p929,1988)

See Also:

Links to other databases for Nabokoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Nabokoite

Cu++7Te++++O4(SO4)5•KCl
Dana No: 30.01.17.01 Strunz No: 07.BC.20
Locality:

Notes: