Frankamenite Mineral Data

Frankamenite Mineral Data +

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General Frankamenite Information

Chemical Formula:

K3Na3Ca5(Si12O30)[F,(OH)]4·(H2O)

Composition:

Molecular Weight = 1,298.37 gm

Potassium 8.73 % K 10.52 % K₂O

Sodium 5.13 % Na 6.92 % Na₂O

Calcium 15.74 % Ca 22.03 % CaO

Manganese 0.42 % Mn 0.55 % MnO

Silicon 25.96 % Si 55.53 % SiO₂

Hydrogen 0.23 % H 2.08 % H₂O

Oxygen 39.68 % O

Fluorine 4.10 % F 4.10 % F

- % F -1.73 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_2.9Na_2.9Ca_5.1Mn²⁺_0.1Si₁₂O₃₀F_2.8(OH)_1.4·0.8(H₂O)

Environment:

Charoitic rocks of the Murun alkaline massif.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Charo and Tokko Rivers, Murun, Murunsky massif, Yakutia, East Siberia, Russia Link to MinDat.org Location Data.

Name Origin:

Named after V.A. Frank-Kamenetsky (1915-1994), Russian mineralogist-crystallographer.

Synonym:

Canasite - triclinic

ICSD 82885

IMA1994-050

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Frankamenite Crystallography

Axial Ratios:

a:b:c =0.7953:1:0.5704

Cell Dimensions:

a = 10.094, b = 12.691, c = 7.24, Z = 1; alpha = 90°, beta = 111.02°, gamma = 110.2° V = 812.50 Den(Calc)= 2.65

Crystal System:

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

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

By Intensity(I/I_o): 2.915(1)(330), 4.7(0.54)(210), 4.21(0.4)(130),5.88(0.37)(020), 3.01(0.25)(246), 2.946(0.14)(040), 2.878(0.06)(141),

Crystal Structure:

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Rozhdestvenskaya I V , Nikishova L V , Lazebnik K A , Mineralogical Magazine , 60 (1996) p.897-905, The crystal structure of frankamenite, Locality: South Yukutia, Russia

Physical Properties of Frankamenite

Cleavage:

[010] Good, [100] Good

Color:

Greenish blue, Bluish gray, Greenish gray, Lilac gray.

Density:

2.68

Diaphaniety:

Transparent to Translucent

Fracture:

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

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

pale blue

Optical Properties of Frankamenite

Gladstone-Dale:

CI meas= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2034,KPDmeas= 0.2011,KC= 0.2056

Optical Data:

Biaxial (+), a=1.536, b=1.539, g=1.542, bire=0.0060

Calculated Properties of Frankamenite

Electron Density:

r_electron=2.63 gm/cc
note: r_Frankamenite=2.65 gm/cc.

Fermion Index

Fermion Index = 0.01253
Boson Index = 0.98747

Photoelectric:

PE_Frankamenite= 4.01 barns/electron
U=PE_Frankamenite x r_electron= 10.57 barns/cc.

Radioactivity:

GRapi = 125.25 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Frankamenite - barely detectable

Frankamenite Classification

Dana Class:

70.2.1.2 (70)Inosilicate Column or Tube Structures

(70.2)with Si2O7 dimers

(70.2.1)Dana Group

70.2.1.1 Miserite K(Ca,Ce)5[Si8O22](OH,F)2 P1 1

70.2.1.2 Frankamenite ! K3Na3Ca5(Si12O30)[F,(OH)]4·(H2O) P1 1

Strunz Class:

VIII/F.35-20 VIII - Silicates

VIII/F - Inosilicates (chain and band) complex chain structure. Cylindric chains and others

VIII/F.35 - Ashcroftine-(Y) series

VIII/F.35-10 Canasite (Na,K)6Ca5Si12O30(OH,F)4 C 2/m 2/m

VIII/F.35-20 Frankamenite K3Na3Ca5(Si12O30)[F,(OH)]4·(H2O) P1 1

VIII/F.35-30 Miserite K(Ca,Ce)5[Si8O22](OH,F)2 P1 1

VIII/F.35-40 Yuksporite (Sr,Ba)2K4(Ca,Na)14([],Mn,Fe){(Ti,Nb)4(O,OH)4[Si6O17]2[Si2O7]3}(H2O,OH)n,n~3 P 2₁/m 2/m

VIII/F.35-50 Charoite K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)·3(H2O) P*/4 ((pseudo Ortho) 2/m

VIII/F.35-60 Eveslogite! (Ca,K,Na,Sr,Ba)48[(Ti,Nb,Fe,Mn)12(OH)12Si48O144](F,OH,Cl)14 P 2/m 2/m

Other Frankamenite Information

References:

NAME( AmMin, Vol 82, p 430) PHYS. PROP.(AmMin, Vol 82, p 430) OPTIC PROP.(AmMin, Vol 82, p 430)

See Also:

Links to other databases for Frankamenite :
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

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Frankamenite

K3Na3Ca5(Si12O30)[F,(OH)]4·(H2O)
Dana No: 70.2.1.2 Strunz No: VIII/F.35-20
Locality:

Notes: