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Kirchhoffite

Collectors Summary

Cleavages keine Spaltbarkeit oder Teilbarkeit beobachtet
Fracture muschelig
Crystal System tetragonal, I41/acd

Chemism

Chemical formula

CsBSi2O6

Additional chem. information

Bor Analog von tetragonalem Pollucit

Chemical composition

Cäsium, Silicium, Bor, Sauerstoff

Unit weight: 295.884792 u; Number of atoms in the formula: 10

Info

Empirical formula:

CsBSi2O6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Boron

B

3.65

1

10.00

10.8117000

10.8117000
Oxygen

O

32.44

6

60.00

15.9994300

95.9965800
Silicon

Si

18.98

2

20.00

28.0855300

56.1710600
Caesium

Cs

44.92

1

10.00

132.9054520

132.9054520

Analysis wt%

SiO2 : 40.47, B2O3 : 11.27, Cs2O : 48.16, Rb2O : 0.09, K2O : 0.11 (Ref: Canadian Mineralogist 2012)

Strunz 9th edition incl. updates

9.GB.05

9: Silikate (Germanate)
G: Gerüstsilikate (Tektosilikate) mit zeolithischem H2O; Familie der Zeolithe
B: Ketten von einfach verbundenen vierer-Ringen
05:Analcim-Gruppe

Lapis Classification

VIII/J.27-025

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
27: Zeolith-Gruppe; Würfelzeolithe

Classification by Hölzel

9.FB.160

9: SILICATES
F: Tektosilicates
B: Leucite-Group

IMA status

anerkannt - März 2010, IMA 2009-094, CNMNC Newsletter, April 2010, page 376; Mineralogical Magazine, 74, 375-377.

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Zeolite group  ⇒ ANA zeolite structure group

Optical Properties

max. Birefringence

0.008
Birefringence chart\! Kirchhoffite title=Birefringence chart Kirchhoffite

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

1.592

RI value γ / ε

1.600

Ri mean

1.595

2V angle

Uniaxial (+)

Crystallography

Crystal System

tetragonal

Class (H-M)

4/mmm

Space Group number

142

Space Group

I41/acd

Cell parameters a (Å)

13.019

Cell parameters b (Å)

-

Cell parameters c (Å)

12.900

Cell parameters a/b or c/a

0.991

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

16

Volumne (ų)

2186.477

X-Ray Powder Diffraction

5.32(32), 3.48(82), 3.26(100), 2.770(67),
2.373(21), 2.294(41), 2.109(34), 1.768(22)
XRD chart Kirchhoffite

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

Crystal Structure 3D

Open larger view

Physical Properties

VHN (Hardness Vickers)

850 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.595 ( ρ calc. Mineralienatlas )

Cleavages

keine Spaltbarkeit oder Teilbarkeit beobachtet

Fracture

muschelig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Tadschikistan/Republik-unterstellte Gebiete (Nohijahoi tobei Dschumhurij)/Dara-i-Pioz (Darai-Pioz)

Type material

Fersman Mineralogisches Museum, Moskau, Russland

Collection number of type material

Registrationsnummer 3923/1.

Preface

Name from

Gustav Robert Kirchhoff (1824–1887), Professor für Physik, entdeckte während seiner Zeit in Heidelberg 1861 zusammen mit Robert Bunsen die Elemente Cäsium und Rubidium.

Author (Name, Year)

Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C. and Karpe

References

IMA 2009-094, CNMNC Newsletter, April 2010, page 376; Mineralogical Magazine, 74, 375-377.

IMA group assignments

Other languages

German

Kirchhoffit

English

Kirchhoffite

CNMNC (IMA)-Number

IMA 2009-094

CNMNC symbol

Symbol

Khf

Locations with GPS information