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Iraqite-(La)

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About Iraqite-(La)Hide

02748800015793133606866.jpg
Flag of Iraq
Formula:
KCa2(La,Ce,Th)Si8O20
Colour:
Pale greenish yellow
Lustre:
Pearly, Dull
Hardness:
Specific Gravity:
3.27
Crystal System:
Tetragonal
Member of:
Name:
Originally named simply iraqite, for the country in which it was discovered, Iraq. The suffix was added by the International Mineralogical Association (IMA) at a later date to indicate the dominant rare-earth-element (REE).
This page provides mineralogical data about Iraqite-(La).


Classification of Iraqite-(La)Hide

Approved
First Published:
1976
9.CH.10

9 : SILICATES (Germanates)
C : Cyclosilicates
H : [Si4O12]8- 4-membered double rings
63.1.1.2

63 : CYCLOSILICATES Condensed Rings
1 : Condensed Rings (Steacyite group)
14.8.8

14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al

Pronounciation of Iraqite-(La)Hide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of Iraqite-(La)Hide

Pearly, Dull
Colour:
Pale greenish yellow
Streak:
Whitish
Hardness:
4½ on Mohs scale
Cleavage:
Distinct/Good
Two good cleavages and a third poor cleavage
Fracture:
Irregular/Uneven
Density:
3.27 g/cm3 (Measured)    
Comment:
Berman balance, correcting for minor impurities and non-structural water

Optical Data of Iraqite-(La)Hide

Type:
Uniaxial (-)
RI values:
nω = 1.590 nε = 1.585
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Iraqite-(La)Hide

Formula:
KCa2(La,Ce,Th)Si8O20

Crystallography of Iraqite-(La)Hide

Crystal System:
Tetragonal

Type Occurrence of Iraqite-(La)Hide

Reference:
Livingstone, A., Atkin, D., Hutchison, D., Al-Hermezi, H.M. (1976) Iraqite, a new rare-earth mineral of the ekanite group. Mineralogical Magazine: 40: 441-445.

Synonyms of Iraqite-(La)Hide

Other Language Names for Iraqite-(La)Hide

Relationship of Iraqite-(La) to other SpeciesHide

Member of:
Other Members of this group:
Arapovite(K1-xx)(Ca,Na)2U4+Si8O20 (x ~ 0.5)Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
Turkestanite(K,◻)(Ca,Na)2ThSi8O20 · nH2OTet. 4/mmm (4/m 2/m 2/m) : P4/mcc

Related Minerals - Nickel-Strunz GroupingHide

9.CH.05Hyalotekite(Ba,Pb,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1
9.CH.05Kapitsaite-(Y)(Ba,K,Pb)4(Y,Ca)2Si8(B,Si)4O28FTric. 1 : P1
9.CH.10SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
9.CH.10Turkestanite(K,◻)(Ca,Na)2ThSi8O20 · nH2OTet. 4/mmm (4/m 2/m 2/m) : P4/mcc
9.CH.10Arapovite(K1-xx)(Ca,Na)2U4+Si8O20 (x ~ 0.5)Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc

Related Minerals - Dana Grouping (8th Ed.)Hide

63.1.1.1SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.8.1Thalénite-(Y)Y3Si3O10FMon.
14.8.2Keiviite-(Y)Y2Si2O7Mon. 2/m : B2/m
14.8.3Keiviite-(Yb)Yb2Si2O7Mon. 2/m : B2/m
14.8.4Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2xMon.
14.8.5ThortveititeSc2Si2O7Mon.
14.8.6Sazhinite-(Ce)Na2CeSi6O14•6H2OOrth. mm2 : Pmm2
14.8.7Monteregianite-(Y)(Na,K)6(Y,Ca)2Si16O38 · 10H2OMon. 2/m
14.8.9Ashcroftine-(Y)K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8 · 8H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
14.8.10Nordite-(La)(La,Ce)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17
14.8.11Nordite-(Ce)(Ce,La)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17
14.8.12JervisiteNaSc3+Si2O6Mon. 2/m : B2/b
14.8.13Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3Trig. 3m : R3c
14.8.14CascanditeCa(Sc,Fe3+)(HSi3O9)Tric. 1

Fluorescence of Iraqite-(La)Hide

None (LW or SW)

Other InformationHide

Notes:
Insoluble in both cold and hot hydrochloric, sulphuric, and nitric acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Iraqite-(La)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Livingstone, A., Atkin, D., Hutchison, D., Al-Hermezi, H.M. (1976) Iraqite, a new rare-earth mineral of the ekanite group. Mineralogical Magazine: 40: 441-445.
Fleischer, M., Pabst, A., Cabri, L.J. (1976) New mineral names. American Mineralogist: 61: 1053-1056.
Perrault, G., Szymanski, J.T. (1982) Steacyite, a new name, and a re-evaluation of the nomenclature of "ekanite"-group minerals. The Canadian Mineralogist: 20(1): 59-63.

Internet Links for Iraqite-(La)Hide

Localities for Iraqite-(La)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Iraq (TL)
 
  • Sulaymaniyah Governorate
    • Qala-Diz (Qala-Dizeh; Qala-Diza)
      • Hero
Mineralogical Magazine, 40, 441-445.
 
Mineral and/or Locality  
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