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Imandrite

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Big Photo

Vuonnemiok River Valley, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© 2008, JGW




Formula:
Na
 
12
Ca
 
3
Fe
3+
2
(Si
 
6
O
 
18
)
 
2
System:OrthorhombicHardness:5 - 5½
Member of:Lovozerite Group


Lovozerite Group

Classification of Imandrite

IMA status:Approved
Strunz 8th edition ID:8/E.16-10
Nickel-Strunz 10th (pending) edition ID:9.CJ.15b

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
Dana 8th edition ID:61.1.2b.1

61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Hey's CIM Ref.:14.25.8

14 : Silicates not Containing Aluminum
25 : Silicates of Fe, Ca and alkalis and of Fe, Mg, Ca and alkalis
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Type Occurrence of Imandrite

Type Locality:Imandra Lake, Vuonnemiok River Valley, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Year of Discovery:1979

Physical Properties of Imandrite

Hardness (Mohs):5 - 5½

Crystallography of Imandrite

Crystal System:Orthorhombic
Cell Parameters:a = 7.42Å, b = 10.54Å, c = 10.33Å
Ratio:a:b:c = 0.704 : 1 : 0.98
Unit Cell Volume:V 807.88 ų (Calculated from Unit Cell)

Optical Data of Imandrite

Type:Biaxial (+)
RI values: nα = 1.605 nβ = 1.608 nγ = 1.612
2V:Measured: 75° , Calculated: 82°
Maximum Birefringence:δ = 0.007

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

Chemical Properties of Imandrite

Formula:
Na
 
12
Ca
 
3
Fe
3+
2
(Si
 
6
O
 
18
)
 
2
Essential elements:Ca, Fe, Na, O, Si
All elements listed in formula:Ca, Fe, Na, O, Si
Common Impurities:Ti,Zr,Mn,Mg

Relationship of Imandrite to other Species

Member of:Lovozerite Group
Other Members of Group:

- +
Combeite
Na
 
2
Ca
 
2
(Si
 
6
O
 
18
)
 
0.5
Kapustinite
Na
 
5
(Na,Mn
2+
 
)
 
<1
Zr(H
 
2
Si
 
6
O
 
18
)
Kazakovite
Na
 
6
Mn
2+
 
Ti(Si
 
6
O
 
18
)
Koashvite
Na
 
6
(Ca,Mn)(Ti,Fe)Si
 
6
O
 
18
 · H
 
2
O
Litvinskite
Na
 
2
(◻,Na,Mn)ZrSi
 
6
O
 
12
(OH,O)
 
6
Lovozerite
Na
 
2
CaZr(H
 
4
Si
 
6
O
 
18
) · H
 
2
O
Tisinalite
Na
 
3
H
 
3
(Mn,Ca,Fe)TiSi
 
6
(O,OH)
 
18
 · 2H
 
2
O
Zirsinalite
Na
 
6
(Ca,Mn
2+
 
,Fe
2+
 
)Zr(Si
 
6
O
 
18
)
Related Minerals - Nickel-Strunz Grouping):

- +
9.CJ.05Bazzite
Be
 
3
Sc
 
2
(Si
 
6
O
 
18
)
9.CJ.05Beryl
Be
 
3
Al
 
2
(Si
 
6
O
 
18
)
9.CJ.05Indialite
Mg
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
9.CJ.05Stoppaniite
Be
 
3
Fe
3+
2
(Si
 
6
O
 
18
) · H
 
2
O
9.CJ.10Cordierite
(Mg,Fe)
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
9.CJ.10Sekaninaite
(Fe,Mg)
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
9.CJ.15aCombeite
Na
 
2
Ca
 
2
(Si
 
6
O
 
18
)
 
0.5
9.CJ.15aKazakovite
Na
 
6
Mn
2+
 
Ti(Si
 
6
O
 
18
)
9.CJ.15cKoashvite
Na
 
6
(Ca,Mn)(Ti,Fe)Si
 
6
O
 
18
 · H
 
2
O
9.CJ.15aLovozerite
Na
 
2
CaZr(H
 
4
Si
 
6
O
 
18
) · H
 
2
O
9.CJ.15aTisinalite
Na
 
3
H
 
3
(Mn,Ca,Fe)TiSi
 
6
(O,OH)
 
18
 · 2H
 
2
O
9.CJ.15aZirsinalite
Na
 
6
(Ca,Mn
2+
 
,Fe
2+
 
)Zr(Si
 
6
O
 
18
)
9.CJ.15aLitvinskite
Na
 
2
(◻,Na,Mn)ZrSi
 
6
O
 
12
(OH,O)
 
6
9.CJ.15aKapustinite
Na
 
5
(Na,Mn
2+
 
)
 
<1
Zr(H
 
2
Si
 
6
O
 
18
)
9.CJ.25Baratovite
KCa
 
7
(Ti,Zr)
 
2
Li
 
3
Si
 
12
O
 
36
F
 
2
9.CJ.25Katayamalite
KCa
 
7
Ti
 
2
Li
 
3
Si
 
12
O
 
36
(OH)
 
2
9.CJ.25Aleksandrovite
KCa
 
7
Sn
 
2
Li
 
3
Si
 
12
O
 
30
F
 
2
9.CJ.30Dioptase
CuSiO
 
3
 · H
 
2
O
9.CJ.35Kostylevite
K
 
2
Zr(Si
 
3
O
 
9
) · H
 
2
O
9.CJ.40Petarasite
Na
 
5
Zr
 
2
(Si
 
6
O
 
18
)(Cl,OH) · 2H
 
2
O
9.CJ.45Gerenite-(Y)
(Ca,Na)
 
2
(Y,REE)
 
3
Si
 
6
O
 
18
 · 2H
 
2
O
9.CJ.50Odintsovite
K
 
2
Na
 
4
Ca
 
3
Ti
 
2
Be
 
4
Si
 
12
O
 
38
9.CJ.55Mathewrogersite
Pb
 
7
FeAl
 
3
GeSi
 
12
O
 
36
(OH,H
 
2
O)
 
6
9.CJ.60Pezzottaite
Cs(Be
 
2
Li)Al
 
2
(Si
 
6
O
 
18
)
Related Minerals - Hey's Index Grouping:

- +
14.25.1Winchite
☐{CaNa}{Mg
 
4
Al}(Si
 
8
O
 
22
)(OH)
 
2
14.25.2Ferri-winchite (of Leake 1978)
14.25.3Alumino-ferrowinchite
14.25.4Ferri-ferrowinchite
☐[CaNa][Fe
2+
4
(Fe
3+
 
,Al)]Si
 
8
O
 
22
(OH)
 
2
14.25.5Ferrowinchite
☐{CaNa}{Fe
2+
4
Al}(Si
 
8
O
 
22
)(OH)
 
2
14.25.6Arfvedsonite
[Na][Na
 
2
][Fe
2+
4
Fe
3+
 
]Si
 
8
O
 
22
(OH)
 
2
14.25.7Ferrorichterite
{Na}{CaNa}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.25.9Yakhontovite
(Ca,Na)
 
0.5
(Cu,Fe,Mg)
 
2
(Si
 
4
O
 
10
)(OH)
 
2
 · 3H
 
2
O

Other Names for Imandrite

Synonyms:
IMA1979-025
Other Languages:
German:Imandrit
Russian:Имандрит
Spanish:Imandrita

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 Imandrite

Reference List:

- +
American Mineralogist (1980): 65: 810.

Doklady Akademii Nauk SSSR: 252: 618-621 (in Russian).

Internet Links for Imandrite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    • Localities for Imandrite

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    (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.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
            • Vuonnemiok River Valley
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
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