Frankamenite
A valid IMA mineral species
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About Frankamenite
Formula:
K3Na3Ca5(Si12O30)(F,OH)4 · H2O
Colour:
Grayish lilac, bluish gray, or light green
Lustre:
Vitreous
Hardness:
5½
Crystal System:
Triclinic
Member of:
Name:
Named by L.V. Nikishova, K.A. Lazebnik, I.V. Rozhdestvenskaya, N.N. Emelyanova, and Y.D. Lazebnik in 1996 in honor of Victor Albertovitch Frank-Kamenetsky (28 February 1915, Vilnius, Lithuania – 12 May 1994), mineralogist-crystallographer.
The mineral was described previously as triclinic canasite.
The mineral was described previously as triclinic canasite.
Dimorph of:
This page provides mineralogical data about Frankamenite.
Unique Identifiers
Mindat ID:
6957
Long-form identifier:
mindat:1:1:6957:7
IMA Classification of Frankamenite
Approved
IMA Formula:
K3Na3Ca5Si12O30F3(OH)·H2O
Approval year:
1994
First published:
1996
Classification of Frankamenite
9.DG.90
9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Fkm | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Frankamenite
Vitreous
Colour:
Grayish lilac, bluish gray, or light green
Streak:
White
Hardness:
5½ on Mohs scale
Cleavage:
Perfect
perfect {010} and {100} cleavages
perfect {010} and {100} cleavages
Optical Data of Frankamenite
Type:
Biaxial (+)
RI values:
nα = 1.536 nβ = 1.539 nγ = 1.542
2V:
Measured: 70° , Calculated: 89°
Max. Birefringence:
δ = 0.006
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
None to Very Low
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r < v strong
Chemistry of Frankamenite
Mindat Formula:
K3Na3Ca5(Si12O30)(F,OH)4 · H2O
Element Weights:
Crystallography of Frankamenite
Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 10.0941(3) Å, b = 12.6913(2) Å, c = 7.2405(1) Å
α = 90.00(2)°, β = 111.02(2)°, γ = 110.20(2)°
α = 90.00(2)°, β = 111.02(2)°, γ = 110.20(2)°
Ratio:
a:b:c = 0.795 : 1 : 0.571
Unit Cell V:
804.42 ų (Calculated from Unit Cell)
Z:
1
Twinning:
microtwinned on (010).
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014522 | Frankamenite | Rozhdestvenskaya I V, Nikishova L V, Lazebnik K A (1996) The crystal structure of frankamenite Mineralogical Magazine 60 897-905 | ![]() | 1996 | South Yukutia, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Loading XRD data...
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.88 Å | (37) |
| 4.70 Å | (54) |
| 4.21 Å | (40) |
| 3.01 Å | (25) |
| 2.915 Å | (100) |
| 2.354 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Frankamenite
General Appearance of Type Material:
laths typically 1 cm and rarely to 15 cm in length
Place of Conservation of Type Material:
Museum of the Saint Petersburg Mining Institute, Russia.
Central Siberian Geological Museum, Novosibirsk, Russia.
Central Siberian Geological Museum, Novosibirsk, Russia.
Geological Setting of Type Material:
Charoite rocks
Synonyms of Frankamenite
Other Language Names for Frankamenite
Relationship of Frankamenite to other Species
Member of:
Other Members of Canasite Group:
| Canasite | K3Na3Ca5Si12O30(OH)4 | Mon. m : Bm |
| Fluorcanasite | K3Na3Ca5Si12O30F4 · H2O | Mon. m : Bm |
Common Associates
Associations Based on Photo Data:
| 21 photos of Frankamenite associated with Charoite | (K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2O |
| 14 photos of Frankamenite associated with Aegirine | NaFe3+Si2O6 |
| 9 photos of Frankamenite associated with Tokkoite | K2Ca4[Si7O18(OH)](OH,F) |
| 7 photos of Frankamenite associated with Tinaksite | K2Na(Ca,Mn2+)2TiO[Si7O18(OH)] |
| 4 photos of Frankamenite associated with Steacyite | K0.3(Na,Ca)2ThSi8O20 |
| 2 photos of Frankamenite associated with Native Copper | Cu |
| 2 photos of Frankamenite associated with Quartz | SiO2 |
| 2 photos of Frankamenite associated with Sphalerite | ZnS |
| 1 photo of Frankamenite associated with Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| 1 photo of Frankamenite associated with Galena | PbS |
Related Minerals - Strunz-mindat Grouping
| 9.DG. | Barrydawsonite-(Y) | Na1.5Y0.5CaSi3O8(OH) |
| 9.DG. | Paratobermorite | Ca5AlSi5O16(OH) · 5H2O |
| 9.DG. | Calcinaksite | KNaCa(Si4O10) · H2O |
| 9.DG. | Alvesite | NaKZrSi6O15 · 2H2O |
| 9.DG.02 | Steedeite | NaMn2[Si3BO9](OH)2 |
| 9.DG.02 | Nolzeite | NaMn2[Si3BO9](OH)2 · 2H2O |
| 9.DG.05 | Murakamiite | LiCa2Si3O8(OH) |
| 9.DG.05 | Serandite | NaMn2+2Si3O8(OH) |
| 9.DG.05 | Bustamite | CaMn2+(Si2O6) |
| 9.DG.05 | Pectolite | NaCa2Si3O8(OH) |
| 9.DG.05 | Tanohataite | LiMn2Si3O8(OH) |
| 9.DG.05 | Dalnegorskite | Ca5Mn2+(Si3O9)2 |
| 9.DG.05 | 'Wollastonite-1A' | CaSiO3 |
| 9.DG.05 | Wollastonite | Ca3(Si3O9) |
| 9.DG.05 | Ferrobustamite | CaFe2+(Si2O6) |
| 9.DG.05 | Schizolite | NaCaMnSi3O8(OH) |
| 9.DG.07 | Cascandite | CaScSi3O8(OH) |
| 9.DG.08 | Plombièrite | Ca5Si6O16(OH)2 · 7H2O |
| 9.DG.10 | Clinotobermorite | Ca5Si6O17 · 5H2O |
| 9.DG.10 | Riversideite | Ca5Si6O16(OH)2 · 2H2O |
| 9.DG.10 | Tobermorite | Ca5Si6O17 · 5H2O |
| 9.DG.12 | Jusite | Na2Ca15Al4Si16O54 · 17H2O |
| 9.DG.12 | Kenotobermorite | Ca4Si6O15(OH)2 · 5H2O |
| 9.DG.15 | Foshagite | Ca4(Si3O9)(OH)2 |
| 9.DG.20 | Jennite | Ca9(Si3O9)2(OH)8 · 8H2O |
| 9.DG.20 | Kamenevite | K2TiSi3O9 · H2O |
| 9.DG.25 | Paraumbite | K3Zr2H(Si3O9)2 · nH2O |
| 9.DG.25 | Umbite | K2(Zr,Ti)Si3O9 · H2O |
| 9.DG.30 | Sørensenite | Na4SnBe2Si6O16(OH)4 |
| 9.DG.32 | Escheite | Ca2NaMnTi5[Si12O34]O2(OH)3 · 12H2O |
| 9.DG.35 | Xonotlite | Ca6(Si6O17)(OH)2 |
| 9.DG.40 | Hillebrandite | Ca2(SiO3)(OH)2 |
| 9.DG.45 | Zorite | Na8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O |
| 9.DG.45 | Chivruaiite | Ca4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O |
| 9.DG.50 | Haineaultite | (Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2O |
| 9.DG.55 | Epididymite | Na2Be2Si6O15 · H2O |
| 9.DG.60 | Eudidymite | Na2Be2Si6O15 · H2O |
| 9.DG.65 | Elpidite | Na2ZrSi6O15 · 3H2O |
| 9.DG.65 | Patynite | NaKCa4[Si9O23] |
| 9.DG.67 | Whelanite | Cu2+2Ca6[Si6O17(OH)](CO3)(OH)3 · 2H2O |
| 9.DG.70 | Enricofrancoite | KNaCaSi4O10 |
| 9.DG.70 | Yusupovite | Na2Zr(Si6O15) · 2.5H2O |
| 9.DG.70 | Litidionite | KNaCuSi4O10 |
| 9.DG.70 | Fenaksite | (K,Na)4(Fe,Mn)2(Si4O10)2(OH,F) |
| 9.DG.70 | Manaksite | KNaMnSi4O10 |
| 9.DG.75 | Senkevichite | CsKNaCa2TiO[Si7O18](OH) |
| 9.DG.75 | Tinaksite | K2Na(Ca,Mn2+)2TiO[Si7O18(OH)] |
| 9.DG.75 | Tokkoite | K2Ca4[Si7O18(OH)](OH,F) |
| 9.DG.80 | Fluorcanasite | K3Na3Ca5Si12O30F4 · H2O |
| 9.DG.80 | Canasite | K3Na3Ca5Si12O30(OH)4 |
| 9.DG.85 | Miserite | K1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2O |
| 9.DG.92 | Charoite | (K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2O |
| 9.DG.95 | Yuksporite | K4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3 |
| 9.DG.97 | Eveslogite | (Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14 |
Radioactivity
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Frankamenite
mindat.org URL:
https://www.mindat.org/min-6957.html
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References for Frankamenite
Reference List:
Rozhdestvenskaya, I. V., Nikishova, L. V., Lazebnik, K. A. (1996) The crystal structure of frankamenite. Mineralogical Magazine, 60 (403) 897-905 doi:10.1180/minmag.1996.060.403.05
Localities for Frankamenite
Showing 5 localities.
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Pekov (1998) |
| Vladykin et al. (2018) +1 other reference | |
| Konev et al. (1996) | |
| Konev et al. (1996) | |
| Konev et al. (1996) |
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The
Magistral'nyi area, Sirenevyi Kamen' Deposit, Murunskii Massif, Chara and Tokko Rivers Confluence, Aldan Shield, Russia