Iraqite-(La) (original) (raw)

A valid IMA mineral species

About Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

Formula:

KCa2(La,Ce,Th)Si8O20

Colour:

Pale greenish yellow

Crystal System:

Tetragonal

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).

Unique IdentifiersHide

This section is currently hidden. Click the show button to view.

Long-form identifier:

mindat:1:1:2041:7

2b51bbae-03ff-4f36-bf0b-55411a715b44

IMA Classification of Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

Type description reference:

Classification of Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

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

Mineral SymbolsHide

This section is currently hidden. Click the show button to view.

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Pronunciation of Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

Pronunciation:

Physical Properties of Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

Colour:

Pale greenish yellow

Hardness:

VHN100=245 - 314 - Vickers

Cleavage:

Distinct/Good
Two good cleavages and a third poor cleavage

Fracture:

Irregular/Uneven

Density:

3.27 g/cm3 (Measured) 3.28 g/cm3 (Calculated)

Comment:

Berman balance, correcting for minor impurities and non-structural water

Optical Data of Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

RI values:

_n_ω = 1.590 _n_ε = 1.585

δ = 0.005

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

anomalously biaxial

Chemistry of Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

Mindat Formula:

KCa2(La,Ce,Th)Si8O20

Crystallography of Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

Crystal System:

Tetragonal

Class (H-M):

4/m m m _(_4/_m_2/_m_2/m ) - Ditetragonal Dipyramidal

Cell Parameters:

a = 7.61(1) Å, c = 14.72(2) Å

Unit Cell V:

852.47 ų (Calculated from Unit Cell)

Morphology:

Anhedral, massive.

Comment:

(by analogy to ekanite).

X-Ray Powder DiffractionHide

This section is currently hidden. Click the show button to view.

Powder Diffraction Data:

Geological EnvironmentHide

This section is currently hidden. Click the show button to view.

Type Occurrence of Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

Place of Conservation of Type Material:

The Natural History Museum, London, England, 1973,481; National School of Mines, Paris, France.

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

This section is currently hidden. Click the show button to view.

Other Language Names for Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

Relationship of Iraqite-(La) to other SpeciesHide

This section is currently hidden. Click the show button to view.

Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

This section is currently hidden. Click the show button to view.

Fluorescence of Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

Other InformationHide

This section is currently hidden. Click the show button to view.

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.

Internet Links for Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

References for Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

Localities for Iraqite-(La)Hide

This section is currently hidden. Click the show button to view.

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 section is currently hidden. Click the show button to view.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.