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Laachite

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Laachit
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Laachit

Bildbreite: 1,5 mm, Fundort: In den Dellen, Mendig, Eifel, Rheinland-Pfalz, Deutschland

Copyright: Stephan Wolfsried
Contribution: Hg 2014-09-03
Locality: In den Dellen (Grube Zieglowski) / Mendig, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland

Collectors Summary

Color dunkel bräunlichrot
Streak color bräunlichrot
Lustre Diamantglanz
Cleavages fehlt
Crystal System monoklin, C2/c
Morphology lange prismatische Kristalle bis 0.02 × 0.04 × 0.5 mm

Chemism

Chem­ical formula

(Ca,Mn)2Zr2Nb2TiFeO14

Empir­ical formula (anal­y­sis)

(Ca0.66Mn0.37Th0.25Y0.20La0.11Ce0.34Nd0.11)(Zr1.36Mn0.64)(Nb1.81Ti1.19)Fe0.69Al0.17Mn0.14)O14.00

Chem­ical com­po­si­tion

Calcium, Eisen, Mangan, Niob, Titan, Zirconium, Sauerstoff

Unit weight: 860.506392399 u; Number of atoms in the formula: 22.04

Info

Empirical formula:

(Ca0.66Mn0.37Th0.25Y0.20La0.11Ce0.34Nd0.11)(Zr1.36Mn0.64)(Nb1.81Ti1.19)Fe0.69Al0.17Mn0.14)O14.00

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

26.03

14

63.52

15.9994300

223.9920200

Aluminium

Al

0.53

0.17

0.77

26.9815382

4.5868615

Calcium

Ca

3.07

0.66

2.99

40.0784000

26.4517440

Titanium

Ti

6.62

1.19

5.40

47.8671000

56.9618490

Manganese

Mn

7.34

1.15

5.22

54.9380499

63.1787574

Iron

Fe

4.48

0.69

3.13

55.8452000

38.5331880

Yttrium

Y

2.07

0.2

0.91

88.9058520

17.7811704

Zirconium

Zr

14.42

1.36

6.17

91.2242000

124.0649120

Niobium

Nb

19.54

1.81

8.21

92.9063820

168.1605514

Lanthanum

La

1.78

0.11

0.50

138.9055200

15.2796072

Cerium

Ce

5.54

0.34

1.54

140.1161000

47.6394740

Neodymium

Nd

1.84

0.11

0.50

144.2430000

15.8667300

Thorium

Th

6.74

0.25

1.13

232.0381100

58.0095275

Strunz 9th edi­tion incl. updates

4.DH.30

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
H: Mit großen (± mittelgroßen) [Kationen]; Lagen kantenverknüpfter Oktaeder
30:Zirkonolith-Zirkelit-Gruppe

IMA sta­tus

anerkannt - CNMNC Newsletter No. 16, August 2013

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

dunkel bräunlichrot

Streak color

bräunlichrot

Diaphane­ity (Trans­parency)

durchscheinend

Lus­tre

Diamantglanz

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell param­e­ters a (Å)

7.3119

Cell param­e­ters b (Å)

14.179

Cell param­e­ters c (Å)

10.1700

Cell param­e­ters a/b or c/a

0.516

Cell param­e­ters c/b

0.717

Cell param­e­ters α

90°

Cell param­e­ters β

90.072°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

1054.378

Kristall struc­ture

Struktur bestimmt, monoklines Analog von Zirkonolith-3O mit Nb dominant über Ti

X-Ray Pow­der Diffrac­tion

4.298(22), 2.967(100), 2.901(59), 2.551(32), 1.800(34), 1.541(24), 1.535(23), 1.529(23)

XRD chart Laachite

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

Morphol­ogy

lange prismatische Kristalle bis 0.02 × 0.04 × 0.5 mm

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

5.417

5.421 ( ρ calc. Mineralienatlas )

Cleav­ages

fehlt

(Co-)Type locality

(Co-)Type locality

Deutschland/Rheinland-Pfalz/Mayen-Koblenz-Kreis/Mendig, Verbandsgemeinde/In den Dellen (Grube Zieglowski)

Type mate­r­ial

Fersman Mineralogical Museum of the Russian Academy of Sciences, Moskau, Russland

Col­lec­tion number of type mate­r­ial

4361/1

Preface

Name from

der Fundortregion Laacher See

Author (Name, Year)

Nikita V. Chukanov, Sergey V. Krivovichev, Anna S. Pakhomova, Igor V. Pekov, Christof Schäfer, Marina F. Vigasina and Konstantin V. Van (2012)

References

Chukanov, N.V., Krivovichev, S.V., Pakhomova, A.S., Pekov, I.V., Schäfer, C., Vigasina, M.F. and Van, K.V. (2013) Laachite, IMA 2012-100. CNMNC Newsletter No. 16, 2013, page 2700; Mineralogical Magazine, 77, 2695-2709.

Lapis Jg. 39, Nr. 6, Juni 2014, S.49

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Laachite

(Ca,Mn)2Zr2Nb2TiFeO14

monoklin : 2/m : C2/c

4.DH.30

'Zirconolite'

CaZrTi2O7

4.DH.30

Stefanweissite

(Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14

orthorhombisch : mmm : Cmca

4.DH.30

Zirconolite-2M

(Ca,Y)Zr(Ti,Mg,Al)2O7

monoklin : 2/m : C2/c

4.DH.30

'Zirconolite-3O' (Pol.v. Zirconolite-2M)

(Ca,Fe,Y,Th)2Fe(Ti,Nb)3Zr2O14

orthorhombisch : mmm : Acam

4.DH.30

'Zirconolite-3T' (Pol.v. Zirconolite-2M)

CaZrTi2O7

trigonal : 32 : P3121

4.DH.30

Nöggerathite-(Ce)

(Ce,Ca)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14

orthorhombisch : mmm : Cmca

4.DH.30

IMA Number

IMA 2012-100

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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