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Aleksandrovite (Aleksandrovit)

Collectors Summary

Color farblos
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 4 - 4.5
Cleavages vollkommen entlang (001)
Crystal System monoklin, C2/c

Chemism

Chemical formula

KCa7Sn2Li3Si12O36F2

Additional chem. information

Sn analog von Baratovit

Chemical composition

Calcium, Lithium, Silicium, Zinn, Fluor, Kalium, Sauerstoff

Unit weight: 1528.8947565 u; Number of atoms in the formula: 63

Info

Empirical formula:

KCa7Sn2Li3Si12O36F2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Lithium

Li

1.36

3

4.76

6.9412000

20.8236000

Oxygen

O

37.67

36

57.14

15.9994300

575.9794800

Fluorine

F

2.49

2

3.17

18.9984033

37.9968065

Silicon

Si

22.04

12

19.05

28.0855300

337.0263600

Potassium

K

2.56

1

1.59

39.0983100

39.0983100

Calcium

Ca

18.35

7

11.11

40.0784000

280.5488000

Tin

Sn

15.53

2

3.17

118.7107000

237.4214000

Analysis wt%

SiO2 : 48.01, Al2O3 : 0.07, TiO2 : 2.86, SnO2 : 12.84, ZrO2 : 1.27, Nb2O5 : 0.11, Fe2O3 : 0.27, Ce2O3 : 0.04, MgO : 0.05, CaO : 25.52, SrO : 0.39, Na2O : 0.20, K2O : 2.91, Li2O : 3.01, F : 1.71, H2O : 0.39, O=F2 : -0.72, Total : 99.12

Strunz 9th edition incl. updates

9.CJ.25

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
J: ~[Si6O18]12- sechser-Einfachringe, ohne inselartig, komplexe [Anionen]
25:Baratovit-Gruppe

Lapis Classification

VIII/E.14-020

VIII: SILIKATE
E: Ringsilikate
14: Sechserringe [Si6O18] 12-

Classification by Hölzel

9.CD.625

9: SILICATES
C: Cyclosilicates
D: ~[Si6O18]-rings, without borate
6: With other anions

IMA status

anerkannt, Neue Mineralien - IMA WEB Seite, Mai 2008

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.009

Birefringence chart\! Aleksandrovite title=Birefringence chart Aleksandrovite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.629

RI value β

1.635

RI value γ / ε

1.638

Ri mean

1.634

2V angle

Biaxial (-) 70.3° (berechnet)

Dispersion

stark; r > v

Optical Data Luminescence

Luminescence

hellblau in kurzwelligem UV (254 nm)

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

17.01

Cell parameters b (Å)

9.751

Cell parameters c (Å)

21.00

Cell parameters a/b or c/a

1.744

Cell parameters c/b

2.154

Cell parameters α

90°

Cell parameters β

112.50

Cell parameters γ

90°

Z

4

Volume (ų)

3218.015

X-Ray Powder Diffraction

4.86(21), 3.712(33), 3.234(100), 3.206(34), 3.039(28), 2.894(42), 2.425(42), 1.950(25)

XRD chart Aleksandrovite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Hardness (Mohs)

4 - 4.5

VHN (Hardness Vickers)

276 - 319, Ø 300 (50g)

Density (g/cm³)

3.05 (gemessen), 3.07 (berechnet)

3.156 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen entlang (001)

Preface

Associations

Pabstit, Calcit, Baratovit, Albit, Quarz, Miserit, Katayamalith, Fluorit, Titanit, Bazirit, Sogdianit, Sugilit, Turkestanit, Fluorapatit

Name from

Benannt nach dem bekannten russischen Geochemist, Geologe, Mineraloge Stanislav Michailowitsch Alexandrow (geb. 1932) für seinen großen Beitrag in der Geologie, Geochemie, Mineralogie und Zinn.

Author (Name, Year)

Leonid Pautov, 2009

References

Neue Mineralien - IMA WEB Seite, Mai 2008

New Data on Minerals 45 (2010), 5

Other languages

German

Aleksandrovit

Spanish

Aleksandrovita

English

Aleksandrovite

Russian

Александровит

CNMNC (IMA)-Number

IMA 2009-004

CNMNC symbol

Symbol

Asd

Locations with GPS information

IDs

GUSID (Global unique identifier short form) KAjIFKT1vEmAhrFoYOgeqg
GUID (Global unique identifier) 14C80828-F5A4-49BC-8086-B16860E81EAA
Database ID 5191