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Iraqite-(La) (Iraqita-(La))

Additional Functions

Collectors Summary

Hardness (Mohs) 4.5
Solubility - Säuren
Crystal System tetragonal, P4/mcc

Chemism

Chemical formula

K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40

Chemical composition

Aluminium, Calcium, Cerium, Lanthanum, Natrium, Silicium, Thorium, Kalium, Sauerstoff

Unit weight: 1564.416899 u; Number of atoms in the formula: 63

Info

Empirical formula:

K(La0.6Ce0.3Th0.1)2(Ca0.75Na0.25)4(Si0.75Al0.25)16O40

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

40.91

40

63.49

15.9994300

639.9772000

Sodium

Na

1.47

1

1.59

22.9897702

22.9897702

Aluminium

Al

6.90

4

6.35

26.9815382

107.9261528

Silicon

Si

21.54

12

19.05

28.0855300

337.0263600

Potassium

K

2.50

1

1.59

39.0983100

39.0983100

Calcium

Ca

7.69

3

4.76

40.0784000

120.2352000

Lanthanum

La

10.65

1.2

1.90

138.9055200

166.6866240

Cerium

Ce

5.37

0.6

0.95

140.1161000

84.0696600

Thorium

Th

2.97

0.2

0.32

232.0381100

46.4076220

Analysis wt%

K2O : 2.76, CaO : 10.73, La2O3 : 6.78, Ce2O3 : 6.44, Pr2O3 : 0.44, Nd2O3 : 0.88, ThO2 : 9.54, UO2 : 0.65, SiO2 : 51.70, Al2O3 : 0.77, H2O : 4.41, Ln2O3 : 15.06 (Ref: Mineralogical Magazine 76)

Strunz 9th edition incl. updates

9.CH.10

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
H: ~[Si4O12]9- vierer-Doppelringe
10:Steacyit-Gruppe

Lapis Classification

VIII/E.10-020

VIII: SILIKATE
E: Ringsilikate
10: Doppelte Viererringe [Si8O20] 8-

Classification by Hölzel

9.CB.830

9: SILICATES
C: Cyclosilicates
B: ~[Si4O12]8-, ~[Si4O10]4--Rings
8: Ekanite-Group

Dana 8th edition

63.01.01.02

63: Cyclosilicates Cyclosilicate Condensed Rings
01: Cyclosilicates Cyclosilicate Condensed Rings 4-membered rings
01: Steacyite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

max. Birefringence

0.005

Birefringence chart\! Iraqite-(La) title=Birefringence chart Iraqite-(La)

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

1.590

RI value γ / ε

1.585

Ri mean

1.588

2V angle

Uniaxial (-)

Crystallography

Crystal System

tetragonal

Class (H-M)

4/mmm

Space Group number

124

Space Group

P4/mcc

Cell parameters a (Å)

7.61

Cell parameters b (Å)

-

Cell parameters c (Å)

14.72

Cell parameters a/b or c/a

1.934

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

1

Volume (ų)

852.466

X-Ray Powder Diffraction

7.62(30),
7.36(80),
5.28(100),
3.40(60),
3.38(80),
3.31(100),
2.64(100),
2.17(40)

XRD chart Iraqite-(La)

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

Physical Properties

Hardness (Mohs)

4.5

VHN (Hardness Vickers)

280

Density (g/cm³)

3.27 (gemessen)

3.047 ( ρ calc. Mineralienatlas )

Instability

- Säuren

Preface

Author (Name, Year)

Livingstone & Atkin & Hutchinson & Al-Hermezi, 1976

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: Ionizing radiation: Radioaktiv

References

Mineralogical Magazine 40 (1976), 441

Other languages

German

Iraqit-(La)

Spanish

Iraqita-(La)

French

Iraqite-(La)

English

Iraqite-(La)

Russian

Иракит-(La)

Alternative Name

German

Irakit-(La)

CNMNC (IMA)-Number

IMA 1973-041

CNMNC symbol

Symbol

Irq-La

IDs

GUSID (Global unique identifier short form) Tg9mYqr_20CXWr6zOY9IaQ
GUID (Global unique identifier) 62660F4E-FFAA-40DB-975A-BEB3398F4869
Database ID 1733