Frankamenite Mineral Data

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.

Name Pronunciation:

Frankamenite + Pronunciation

Synonym:

Canasite - triclinic

ICSD 82885

IMA1994-050

Frankamenite Image

Images:

Frankamenite

Comments: Grayish lilac, fine-grained frankamentite.
Location: Murun Massif, Irkutsk District, Russia. Scale: Specimen Size 3.5x2.5x2.5 cm.
© Sonke Stolze / Systematic Minerals

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

Diaphaneity:

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= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2011,KPDmeas= 0.2011,KC= 0.2056
Ncalc = 1.55

Optical Data:

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

Calculated Properties of Frankamenite

Electron Density:

Bulk Density (Electron Density)=2.66 gm/cc
note: Specific Gravity of Frankamenite =2.68 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Frankamenite= 4.01 barns/electron
U=PE_Frankamenite x r_electron= 10.69 barns/cc.

Radioactivity:

GRapi = 125.25 (Gamma Ray American Petroleum Institute Units)
Concentration of Frankamenite per GRapi unit = 0.80 (%)

Estimated Radioactivity from Frankamenite - barely detectable

Frankamenite Classification

Dana Class:

70.02.01.02 (70)Inosilicate Column or Tube Structures

(70.02)with Si2O7 dimers

(70.02.01)Dana Group

70.02.01.01 Miserite K1.5-x(Ca,Y,REE)5[Si6O15][Si2O7](OH,F)2•yH2O P1 1

70.02.01.02 Frankamenite! K3Na3Ca5(Si12O30)[F,(OH)]4•(H2O) P1 1

Strunz Class:

09.DG.90 09 - SILICATES (Germanates)

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

09.DG -Inosilicates with 3-periodic single and multiple chains

09.DG.90 Frankamenite! K3Na3Ca5(Si12O30)[F,(OH)]4•(H2O) P1 1

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

Frankamenite

K3Na3Ca5(Si12O30)[F,(OH)]4•(H2O)
Dana No: 70.02.01.02 Strunz No: 09.DG.90
Locality:

Notes: