Niksergievite Mineral Data

General Niksergievite Information

Chemical Formula:

[Ba,Ca)2(Al,Si)7O10(CO3)(OH)6•nH2O

Composition:

Molecular Weight = 722.73 gm

Potassium 0.11 % K 0.13 % K₂O

Barium 24.13 % Ba 26.94 % BaO

Calcium 3.60 % Ca 5.04 % CaO

Magnesium 0.24 % Mg 0.39 % MgO

Aluminum 13.03 % Al 24.62 % Al₂O₃

Iron 0.15 % Fe 0.20 % FeO

Silicon 13.29 % Si 28.43 % SiO₂

Hydrogen 0.92 % H 8.23 % H₂O

Carbon 1.65 % C 6.03 % CO₂

Oxygen 42.88 % O

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

Ba_1.27Ca_0.65K_0.02Al_3.49Si_3.42Mg_0.07Fe²⁺_0.02O₁₀(CO₃)_0.99ï¿½0.2(H₂O)(OH)_6.2

Environment:

Found in intensively metamorphosed dolomites and limestones enriched in galena, sphalerite and pyrite. Surite series.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Tekeli Pb-Zn mine (now abandoned) is located in southeast Kazakhstan, 44° N, 78° E, near the village of Tekeli. Link to MinDat.org Location Data.

Name Origin:

Named in honor of Prof. Nikolai Grigorievich Sergiev (1901-1960), a Soviet geologist, for his contributions to the geology of Kazakhstan.

Synonym:

IMA2002-036

Niksergievite Image

Images:

Niksergievite

Comments: Pale blue to colorless lamellar fragment of niksergievite.
Location: Tekeli mine, Karatau, Kazakhstan. Scale: See Image.
© Rruff Database

Niksergievite Crystallography

Axial Ratios:

a:b:c =0.5758:1:1.7984

Cell Dimensions:

a = 5.176, b = 8.989, c = 16.166, Z = 2; beta = 96.44° V = 747.41 Den(Calc)= 3.21

Crystal System:

Monoclinic Space Group: C 2/m, C 2, or Cm

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

By Intensity(I/I_o): 2.585(1)(130,201,131), 2.23(0.9)(134,220 ), 4.49(0.9)(020 ), 2.069(0.8)(043 )1.692(0.6)(311,151,240)3.68(0.6)(014,113 ), 16.1(0.4)(001 ),

Physical Properties of Niksergievite

Cleavage:

{001} Perfect

Color:

Light greenish white.

Density:

3.16

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

1-1.5 - Talc or a little harder

Luster:

Pearly

Streak:

white

Optical Properties of Niksergievite

Gladstone-Dale:

CI meas= 0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.19,KPDmeas= 0.193,KC= 0.1973
Ncalc = 1.62 - 1.63

Optical Data:

Biaxial (-), a=1.58, b=1.625, g=1.625, bire=0.0450

Calculated Properties of Niksergievite

Electron Density:

Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Niksergievite =3.16 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Niksergievite}= 102.34 barns/electron
U=PE_{Niksergievite} x r_electron= 310.19 barns/cc.

Radioactivity:

GRapi = 1.51 (Gamma Ray American Petroleum Institute Units)
Concentration of Niksergievite per GRapi unit = 66.34 (%)

Estimated Radioactivity from Niksergievite - barely detectable

Niksergievite Classification

Dana Class:

71.02.04.03 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.02)with 2:1 Layers

(71.02.04)Surite group

71.02.04.01 Ferrisurite (Pb,Cu)2-3(CO3)1.5-2(OH,F)0.5-1[(Fe,Al)2Si4O10(OH)2]•n(H2O) P 2₁ or P 2₁/m Mono

71.02.04.02 Surite (Pb,Cu)2-3(CO3)1.5-2(OH,F)0.5-1[(Al,Fe)2(Si,Al)4O10(OH)2]•n(H2O) P 2₁ ro P 2₁/m Mono

71.02.04.03 Niksergievite! [Ba,Ca)2(Al,Si)7O10(CO3)(OH)6•nH2O C 2/m, C 2, or Cm Mono

Strunz Class:

09.EC.75 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.75 Ferrisurite (Pb,Cu)2-3(CO3)1.5-2(OH,F)0.5-1[(Fe,Al)2Si4O10(OH)2]•n(H2O) P 2₁ or P 2₁/m Mono

09.EC.75 Surite (Pb,Cu)2-3(CO3)1.5-2(OH,F)0.5-1[(Al,Fe)2(Si,Al)4O10(OH)2]•n(H2O) P 2₁ ro P 2₁/m Mono

09.EC.75 Niksergievite! [Ba,Ca)2(Al,Si)7O10(CO3)(OH)6•nH2O C 2/m, C 2, or Cm Mono

Other Niksergievite Information

References:

NAME( AmMin, v90, no7, p1163) PHYS. PROP.(AmMin, v90, no7, p1163) OPTIC PROP.(AmMin, v90, no7, p1163)

See Also:

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

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Niksergievite

[Ba,Ca)2(Al,Si)7O10(CO3)(OH)6•nH2O
Dana No: 71.02.04.03 Strunz No: 09.EC.75
Locality:

Notes:

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