Kupletskite Mineral Data

General Kupletskite Information

Chemical Formula:

K2Na(Mn,Fe++)7(Ti,Nb)2Si8O26(OH)4F

Composition:

Molecular Weight = 1,337.34 gm

Potassium 6.58 % K 7.92 % K₂O

Sodium 1.29 % Na 1.74 % Na₂O

Titanium 5.37 % Ti 8.96 % TiO₂

Manganese 21.57 % Mn 27.85 % MnO

Niobium 3.47 % Nb 4.97 % Nb₂O₅

Iron 7.31 % Fe 9.40 % FeO

Silicon 16.80 % Si 35.94 % SiO₂

Hydrogen 0.30 % H 2.69 % H₂O

Oxygen 35.89 % O

Fluorine 1.42 % F 1.42 % F

- % F -0.60 % -O=F₂

______ ______

100.00 % 100.30 % = TOTAL OXIDE

Empirical Formula:

K_2.25Na_0.75Mn²⁺_5.25Fe²⁺_1.75Ti_1.5Nb_0.5Si₈O₂₆(OH)₄(F)

Environment:

The monoclinic version is kukpletskite-Ma2b2c and the triclinic version is kupletskite-1A

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Boris Mikhailovich Kupletski (1984-1964) and Elsa Maximilianove Bohnshtedt Kupletskaya (1897-1974), Russian geologists.

Name Pronunciation:

Kupletskite + Pronunciation

Synonym:

ICSD 86867

PDF 26-6

Kupletskite Image

Images:

Kupletskite

Comments: Bronze-colored stellate crystalline spray of kupletskite on white orthoclase.
Location: 3M quarry, Little Rock, Pulaski County, Arkansas, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Niobokupletskite Kupletskite

Comments: Back-scattered electron image of Niobokupletskite (Nkpt) rimming kupletskite (Kpt). The zoning in the kupletskite is from Nb-poor to Nb-rich in the direction of the arrow (dark to medium gray). (CanMin v 38, p 628).
Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Scale bar 100 µ-m.
© Canadian Mineralogist

Kupletskite Crystallography

Axial Ratios:

a:b:c =0.2325:1:0.9118

Cell Dimensions:

a = 5.4022, b = 23.226, c = 21.1782, Z = 4; beta = 95.246° V = 2,646.13 Den(Calc)= 3.36

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 2.64(1), 3.51(1), 2.57(0.5),1.732(0.4), 2.1(0.4), 2.76(0.1), 3(0.1), 3.25(0.1),

Physical Properties of Kupletskite

Cleavage:

{001} Perfect

Color:

Yellow brown, Black, Black brown.

Density:

3.2 - 3.23, Average = 3.21

Diaphaneity:

Translucent to Opaque

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4 - Fluorite

Luster:

Vitreous - Adamantine

Streak:

brown

Optical Properties of Kupletskite

Gladstone-Dale:

CI meas= 0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2069,KPDmeas= 0.2163,KC= 0.2245
Ncalc = 1.72 - 1.75

Optical Data:

Biaxial (-), a=1.656, b=1.699, g=1.731, bire=0.0750, 2V(Calc)=78, 2V(Meas)=79.

Calculated Properties of Kupletskite

Electron Density:

Bulk Density (Electron Density)=3.11 gm/cc
note: Specific Gravity of Kupletskite =3.22 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Kupletskite= 15.04 barns/electron
U=PE_Kupletskite x r_electron= 46.72 barns/cc.

Radioactivity:

GRapi = 91.72 (Gamma Ray American Petroleum Institute Units)
Concentration of Kupletskite per GRapi unit = 1.09 (%)

Estimated Radioactivity from Kupletskite - barely detectable

Kupletskite Classification

Dana Class:

69.01.01.02 (69)Inosilicate Chains with Side Branches or Loops

(69.01)with (P=2, and N=4, 2 branches)

(69.01.01)Astrophyllite group

69.01.01.01 Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1

69.01.01.02 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m

69.01.01.03 Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1

69.01.01.04 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri

69.01.01.05 Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1

69.01.01.06 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1

69.01.01.07 Magnesioastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m

69.01.01.08 Niobokupletskite! K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) P1 1

69.01.01.09 Nalivkinite! Li2NaFe7Ti2Si8O24(OH)4F P1 1

Strunz Class:

09.DC.05 09 - SILICATES (Germanates)

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

09.DC -Inosilicates with branched 2-periodic single chains Si2O6 + 2SiO3 ï¿½ Si4O12

09.DC.05 Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1

09.DC.05 Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1

09.DC.05 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m

09.DC.05 Magnesioastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m

09.DC.05 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1

09.DC.05 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri

09.DC.05 Nalivkinite! Li2NaFe7Ti2Si8O24(OH)4F P1 1

09.DC.05 Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1

09.DC.05 Niobokupletskite! K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) P1 1

Other Kupletskite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin, Vol 87, p 768) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Kupletskite :
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

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Kupletskite

K2Na(Mn,Fe++)7(Ti,Nb)2Si8O26(OH)4F
Dana No: 69.01.01.02 Strunz No: 09.DC.05
Locality:

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