Kalifersite Mineral Data

Kalifersite Mineral Data +

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General Kalifersite Information

Chemical Formula:

(K,Na)5Fe+++7Si20O50(OH)6·12(H2O)

Composition:

Molecular Weight = 2,242.17 gm

Potassium 6.10 % K 7.35 % K₂O

Sodium 1.54 % Na 2.07 % Na₂O

Iron 17.44 % Fe 24.93 % Fe₂O₃

Silicon 25.05 % Si 53.59 % SiO₂

Hydrogen 1.35 % H 12.05 % H₂O

Oxygen 48.52 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_3.5Na_1.5Fe³⁺₇Si₂₀O₅₀(OH)₆·12(H₂O)

Environment:

In a hydrothermally altered pegmatite. Polysomatic series with palygorskite and sepiolite.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Mt. Kukisvumchorr, Khibina massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For the chemical composition: KALIum (Potassium), FERrum (Iron), and SIlicium (Silicon).

Synonym:

ICSD 85700

IMA1996-007

Kalifersite Image

Images:

Kalifersite

Comments: Brownish-red crystalline granular aggregates of kalifersite in rock matrix composed of fibers to 5mm.
Location: Mt. Rasvumchorr, Khibiny massif, Kola Peninsula, Russia. Scale: Specimen size 3.5 x 2 x 1.5cm.
© Tom Loomis / Dakota Matrix

Kalifersite Crystallography

Axial Ratios:

a:b:c =0.7234:1:0.2575

Cell Dimensions:

a = 14.86, b = 20.54, c = 5.29, Z = 1; alpha = 95.6°, beta = 92.3°, gamma = 94.4° V = 1,600.90 Den(Calc)= 2.33

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 12.36(1), 11.6(0.4), 3.411(0.37),

Crystal Structure:

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Ferraris G , Khomyakov A P , Belluso E , Soboleva S V , European Journal of Mineralogy , 10 (1998) p.865-874, Kalifersite, a new alkaline silicate from Kola Peninsula (Russia), based on a palygorskite-sepiolite polysomatic series, Locality: Kola Peninsula, Russia

Physical Properties of Kalifersite

Cleavage:

[100] Good, [010] Good

Color:

Brownish pink.

Density:

2.28 - 2.37, Average = 2.32

Diaphaniety:

Translucent

Fracture:

Fibrous - Thin, elongated fractures produced by crystal forms or intersecting cleavages (e.g. asbestos).

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

2 - Gypsum

Luster:

Silky

Streak:

white

Optical Properties of Kalifersite

Gladstone-Dale:

CI meas= 0.081 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.083 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2286,KPDmeas= 0.2291,KC= 0.2493

Optical Data:

Biaxial (+), a=1.523, b=1.525, g=1.55, bire=0.0270, 2V(Calc)=32, 2V(Meas)=30. Dispersion not discernible.

Calculated Properties of Kalifersite

Electron Density:

r_electron=2.32 gm/cc
note: r_Kalifersite=2.33 gm/cc.

Fermion Index

Fermion Index = 0.01563
Boson Index = 0.98437

Photoelectric:

PE_Kalifersite= 6.72 barns/electron
U=PE_Kalifersite x r_electron= 15.59 barns/cc.

Radioactivity:

GRapi = 87.88 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Kalifersite - barely detectable

Kalifersite Classification

Dana Class:

74.3.1a.4 (74)Phyllosilicate Modulated Layers

(74.3)with joined strips

(74.3.1a)Palygorskite-sepiolite group (Palygorskite subgroup)

74.3.1a.1 Palygorskite (Mg,Al)2Si4O10(OH)·4(H2O) C 2/m 2/m

74.3.1a.2 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2·n(H2O) C 2/m Mono

74.3.1a.3 Yofortierite (Mn,Mg)5Si8O20(OH)2·8-9(H2O) Pn(?) m

74.3.1a.4 Kalifersite ! (K,Na)5Fe7Si20O50(OH)6·12(H2O) P1 1

Strunz Class:

VIII/H.33-90 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.33 - Tuperssuatsiaite - Loughlinite series

VIII/H.33-10 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2·n(H2O) C 2/m Mono

VIII/H.33-20 Palygorskite (Mg,Al)2Si4O10(OH)·4(H2O) C 2/m 2/m

VIII/H.33-30 Yofortierite (Mn,Mg)5Si8O20(OH)2·8-9(H2O) Pn(?) m

VIII/H.33-40 Sepiolite Mg4Si6O15(OH)2·6(H2O) Pnan 2/m 2/m 2/m

VIII/H.33-50 Falcondoite (Ni,Mg)4Si6O15(OH)2·6(H2O) Pncn 2/m 2/m 2/m

VIII/H.33-60 Loughlinite Na2Mg3Si6O16·8(H2O) Unk Ortho

VIII/H.33-80 Intersilite! Na6MnTi[Si10O24(OH)](OH)3·4(H2O) I2/m 2/m

VIII/H.33-90 Kalifersite (K,Na)5Fe7Si20O50(OH)6·12(H2O) P1 1

Other Kalifersite Information

References:

NAME( MinRec) PHYS. PROP.(Eur. J. Min.,Vol.10,p865,1998) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Kalifersite :
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 - WWW-MINCRYST

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Kalifersite

(K,Na)5Fe+++7Si20O50(OH)6·12(H2O)
Dana No: 74.3.1a.4 Strunz No: VIII/H.33-90
Locality:

Notes: