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Imandrite

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

Formula:
Na
 
12
Ca
 
3
Fe
3+
2
[Si
 
6
O
 
18
]
 
2
System:OrthorhombicHardness:5 - 5½
This page provides mineralogical data about Imandrite.

Classification of Imandrite

IMA status:Approved
Strunz 8th edition ID:8/E.16-10
Nickel-Strunz 10th (pending) edition ID:9.CJ.20

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

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
 
4
Si
 
5
O
 
18
9.CJ.05Stoppaniite
(Fe,Al,Mg)
 
4
(Na,[ ])
 
2
[Be
 
6
Si
 
12
O
 
36
]·2(H2O)
9.CJ.05Pezzottaite
Cs(Be
 
2
Li)Al
 
2
Si
 
6
O
 
18
9.CJ.10Cordierite
(Mg,Fe)
 
2
Al
 
4
Si
 
5
O
 
18
9.CJ.10Sekaninaite
(Fe,Mg)
 
2
Al
 
4
Si
 
5
O
 
18
9.CJ.15Combeite
Na
 
2
Ca
 
2
Si
 
3
O
 
9
9.CJ.15Kazakovite
Na
 
6
Ti[Si
 
6
O
 
16
(OH)
 
2
]
9.CJ.15Lovozerite
(Na,Ca)
 
3
(Zr,Ti)[Si
 
6
(O,OH)
 
18
]
9.CJ.15Tisinalite
Na
 
3
H
 
3
(Mn,Ca,Fe)TiSi
 
6
(O,OH)
 
18
·2H
 
2
O
9.CJ.15Zirsinalite
Na
 
6
(Ca,Mn
2+
 
,Fe
2+
 
)Zr[Si
 
6
O
 
18
]
9.CJ.15Litvinskite
Na
 
2
([],Na,Mn)ZrSi
 
6
O
 
12
(OH,O)
 
6
9.CJ.15Kapustinite
Na
 
5
(Na,Mn
2+
 
)
 
<1
Zr[Si
 
6
O
 
16
(OH)
 
2
]
9.CJ.20Koashvite
Na
 
6
(Ca,Mn)(Ti,Fe)Si
 
6
O
 
18
·H
 
2
O
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.30Dioptase
CuSiO
 
2
(OH)
 
2
9.CJ.35Kostylevite
K
 
2
ZrSi
 
3
O
 
9
·H
 
2
O
9.CJ.40Petarasite
Na
 
5
Zr
 
2
[(OH,Cl)|Si
 
6
O
 
18
]·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
(Fe
2+
 
,Cu)Al
 
3
Ge[(OH,H
 
2
O)
 
6
|(Si
 
3
O
 
9
)
 
4
]
Related Minerals - Hey's Index Grouping:
14.25.1Winchite
☐[CaNa][Mg
 
4
(Al,Fe
3+
 
)][(OH)
 
2
|Si
 
8
O
 
22
]
14.25.2Ferri-winchite (of Leake 1978)
14.25.3Alumino-ferrowinchite
14.25.4Ferri-ferrowinchite
☐[CaNa][Fe
2+
4
(Fe
3+
 
,Al)][(OH)
 
2
|Si
 
8
O
 
22
]
14.25.5Ferrowinchite
☐[CaNa][Fe
2+
4
(Al,Fe
3+
 
)][(OH)
 
2
|Si
 
8
O
 
22
]
14.25.6Arfvedsonite
[Na][Na
 
2
][Fe
2+
4
Fe
3+
 
][(OH)
 
2
|Si
 
8
O
 
22
]
14.25.7Ferrorichterite
Na[CaNa][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
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
German names:
Imandrit
Russian names:
Имандрит
Spanish names:
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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    Localities for Imandrite

    (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
    Mineral and/or Locality
    Google
     
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