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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; Region of Republican Subordination)/Dara-i-Pioz (Darai-Pioz; Dara-i-Pech)

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

 
Zeolite group
 
 
 

 
 
ANA zeolite structure group
 
 
 

 
 
 
Ammonioleucite
(NH4)(AlSi2O6)
tetragonal
I41/a

 
 
 
Analcime
Na(Si2Al)O6·H2O
orthorhombisch
Ibca

 
 
 
Hsianghualite
Ca3Li2Be3(SiO4)3F2
kubisch
I213

 
 
 
Kirchhoffite
CsBSi2O6
tetragonal
I41/acd

 
 
 
Leucite
K(AlSi2)O6
tetragonal
I41/a

 
 
 
Pollucite
(Cs,Na)(Si2Al)O6·nH2O
kubisch
Ia3d

 
 
 
Wairakite
CaAl2Si4O12·2H2O
monoklin
I2/a

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Actuality: 19. Jun 2022 - 04:14:35

Other languages

German

Kirchhoffit

English

Kirchhoffite

CNMNC (IMA)-Number

IMA 2009-094

CNMNC symbol

Symbol

Khf

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