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Iraqite-(La)

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Formula:
K(Ca,Na)
 
2
(La,Ce,Th)[(Si,Al)
 
8
O
 
20
]
System:TetragonalHardness:4½
Member of:Steacyite Group
This page provides mineralogical data about Iraqite-(La).

Classification of Iraqite-(La)

IMA status:Approved
Strunz 8th edition ID:8/E.10-20
Nickel-Strunz 10th (pending) edition ID:9.CH.10

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

63 : CYCLOSILICATES Condensed Rings
1 : Condensed Rings (Steacyite group)
Hey's CIM Ref.:14.8.8

14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al
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Type Occurrence of Iraqite-(La)

Type Locality:Shakhi-Rash Mt., Hero, Qala-Diz (Qala-Dizeh; Qala-Diza), Iraq

Physical Properties of Iraqite-(La)

Hardness (Mohs):4½

Crystallography of Iraqite-(La)

Crystal System:Tetragonal

Optical Data of Iraqite-(La)

Type:Uniaxial (-)
RI values: nω = 1.590 nε = 1.585
Maximum Birefringence:δ = 0.005

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Iraqite-(La)

Formula:
K(Ca,Na)
 
2
(La,Ce,Th)[(Si,Al)
 
8
O
 
20
]
Essential elements:Ca, K, La, O, Si
All elements listed in formula:Al, Ca, Ce, K, La, Na, O, Si, Th

Relationship of Iraqite-(La) to other Species

Member of:Steacyite Group
Other Members of Group:

- +
Arapovite
(K,◻)(Ca,Na)
 
2
(U,Th)[Si
 
8
O
 
20
] · H
 
2
O
Steacyite
(◻,K)(Na,Ca)
 
2
(Th,U)[Si
 
8
O
 
20
]
Turkestanite
(K,◻)(Ca,Na)
 
2
(Th,U)[Si
 
8
O
 
20
] · nH
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
9.CH.05Hyalotekite
(Ba,Pb,Ca,K)
 
6
(B,Si,Al)
 
2
(Si,Be)
 
10
O
 
28
(F,Cl)
9.CH.05Kapitsaite-(Y)
(Ba,K,Pb)
 
4
(Y,Ca)
 
2
Si
 
8
(B,Si)
 
4
O
 
28
F
9.CH.10Steacyite
(◻,K)(Na,Ca)
 
2
(Th,U)[Si
 
8
O
 
20
]
9.CH.10Turkestanite
(K,◻)(Ca,Na)
 
2
(Th,U)[Si
 
8
O
 
20
] · nH
 
2
O
9.CH.10Arapovite
(K,◻)(Ca,Na)
 
2
(U,Th)[Si
 
8
O
 
20
] · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.8.1Thalénite-(Y)
Y
 
3
(Si
 
3
O
 
10
)(OH)
14.8.2Keiviite-(Y)
(Y,Yb)
 
2
[Si
 
2
O
 
7
]
14.8.3Keiviite-(Yb)
(Yb,Y)
 
2
Si
 
2
O
 
7
14.8.4Tombarthite-(Y)
Y
 
4
(Si,H
 
4
)
 
4
O
 
12-x
(OH)
 
4+2x
14.8.5Thortveitite
(Sc,Y)
 
2
Si
 
2
O
 
7
14.8.6Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
14.8.7Monteregianite-(Y)
(Na,K)
 
6
(Y,Ca)
 
2
Si
 
16
O
 
38
 · 10H
 
2
O
14.8.9Ashcroftine-(Y)
K
 
5
Na
 
5
(Y,Ca)
 
12
Si
 
28
O
 
70
(OH)
 
2
(CO
 
3
)
 
8
 · 8H
 
2
O
14.8.10Nordite-(La)
(La,Ce)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.11Nordite-(Ce)
(Ce,La)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.12Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)Si
 
2
O
 
6
14.8.13Cerite-(Ce)
(Ce,Ca)
 
9
(Fe,Mg)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
14.8.14Cascandite
Ca(Sc,Fe
3+
 
)(HSi
 
3
O
 
9
)

Other Names for Iraqite-(La)

Synonyms:
IMA1973-041
Other Languages:
German:Irakit-(La)

Other Information

Health Warning: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)

Reference List:

- +
American Mineralogist: 61: 1054.

Mineralogical Magazine: 40: 441-445.

Canadian Mineralogist: (1982): 20: 59-63.

Internet Links for Iraqite-(La)

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  • Raman and XRD data at RRUFF project
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  • Iraqite-(La) details from Handbook of Mineralogy (PDF)
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    • Localities for Iraqite-(La)

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Iraq
     
    • Qala-Diz (Qala-Dizeh; Qala-Diza)
      • Hero
    		Mineral. Mag., 40, 441-445.
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