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Aleksandrovite

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Formula:
KCa7Sn2Li3Si12O36F2
Colour:
Colourless
Lustre:
Vitreous
Hardness:
4 - 4½
Specific Gravity:
3.05
Crystal System:
Monoclinic
Name:
Named in honour of Stanislav Mikhailovich Aleksandrov (Станислава Михайловича Александрова) (14 June 1932 - 9 May 2012), a well-known Russian geochemist, geologist, and mineralogist, for his great contributions in geology, geochemistry, and the mineralogy of tin.
Isostructural with:
Sn analog of baratovite.


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Classification of AleksandroviteHide

Approved
Approval Year:
2009
9.CJ.25

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions

Pronounciation of AleksandroviteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of AleksandroviteHide

Vitreous
Transparency:
Transparent
Comment:
pearly on cleaved surfaces
Colour:
Colourless
Streak:
White
Hardness:
4 - 4½ on Mohs scale
Hardness:
VHN50=276 - 319 kg/mm2 - Vickers
Cleavage:
Perfect
on {001}
Density:
3.05(2) g/cm3 (Measured)    3.07(2) g/cm3 (Calculated)

Optical Data of AleksandroviteHide

Type:
Biaxial (-)
RI values:
nα = 1.629(2) nβ = 1.635(4) nγ = 1.638(2)
2V:
Measured: 70.3°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v, strong

Chemical Properties of AleksandroviteHide

Formula:
KCa7Sn2Li3Si12O36F2

Crystallography of AleksandroviteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 17.01(2) Å, b = 9.751(6) Å, c = 21.00(2) Å
β = 112.45(8)°
Ratio:
a:b:c = 1.744 : 1 : 2.154
Unit Cell V:
3219 ų
Z:
4
Morphology:
Lamellae up to 50–70 μm with no detectable zoning and zoned crystals up to 0.8 mm and aggregates of zoned and sectorial grains where separate zones represented by aleksandrovite, baratovite, or katayamalite.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.86 Å(21)
3.712 Å(33)
3.234 Å(100)
3.206 Å(34)
3.039 Å(28)
2.894 Å(42)
2.425 Å(42)
1.950 Å(25)

Type Occurrence of AleksandroviteHide

General Appearance of Type Material:
inclusions in baratovite
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia (registration No. 3825/1).
Geological Setting of Type Material:
In a zonal microcline-calcite vein with aegirine-hedenbergite, quartz, and albite in a moraine boulder of intensively altered clay schist.
Associated Minerals at Type Locality:

Synonyms of AleksandroviteHide

Related Minerals - Nickel-Strunz GroupingHide

9.CJ.Avdeevite(Na,Cs)(Be2Li)Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.CJ.05BazziteBe3Sc2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05IndialiteMg2Al3(AlSi5O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05StoppaniiteBe3Fe3+2(Si6O18) · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.10Cordierite(Mg,Fe)2Al3(AlSi5O18)Orth. mmm (2/m 2/m 2/m) : Cccm
9.CJ.10Sekaninaite(Fe,Mg)2Al3(AlSi5O18)Orth.
9.CJ.15aCombeiteNa4.5Ca3.5Si6O17.5(OH)0.5Trig. 3m (3 2/m) : R3m
9.CJ.15bImandriteNa12Ca3Fe3+2(Si6O18)2Orth.
9.CJ.15aKazakoviteNa6Mn2+Ti(Si6O18)Trig.
9.CJ.15cKoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2OOrth.
9.CJ.15aLovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OMon.
9.CJ.15aTisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2OTrig.
9.CJ.15aZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)Trig.
9.CJ.15aLitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6Mon. m : Bm
9.CJ.15aKapustiniteNa5(Na,Mn2+)<1Zr(H2Si6O18)Mon. 2/m
9.CJ.25BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2Mon. 2/m : B2/b
9.CJ.25KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2Mon. 2/m : B2/b
9.CJ.30DioptaseCuSiO3 · H2OTrig. 3 : R3
9.CJ.35KostyleviteK2Zr(Si3O9) · H2OMon.
9.CJ.40PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
9.CJ.45Gerenite-(Y)(Ca,Na)2(Y,REE)3Si6O18 · 2H2OTric.
9.CJ.50OdintsoviteK2Na4Ca3Ti2Be4Si12O38Orth.
9.CJ.55MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6Trig.
9.CJ.60PezzottaiteCs(Be2Li)Al2(Si6O18)Trig. 3 : R3

Fluorescence of AleksandroviteHide

Light blue under short-wave (254 nm) UV radiation.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for AleksandroviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
IMA Approvals May 2009
Pautov, L.A., Agakhanov, A.A., Karpenko, V.Yu., Gafurov, F.G. (2010) Aleksandrovite KLi3Ca7Sn2[Si6O18]2F2 — a new tin mineral. Novye dannye o mineralakh: 45: 5–16 (in Russian). New data on minerals: 45: 5–16 (in English).

Internet Links for AleksandroviteHide

Localities for AleksandroviteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Tajikistan (TL)
 
  • Districts of Republican Subordination
Pautov, L.A., Agakhanov, A.A., Karpenko, V.Yu. & Gafurov, F.G. (2010) Aleksandrovite KLi3Ca7Sn2[Si6O18]2F2 — a new tin mineral. Novye dannye o mineralakh, 45, 5–16 (in Russian). New data on minerals, 45, 5–16 (in English).
 
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