Imandrite
A valid IMA mineral species
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About Imandrite
Formula:
Na12Ca3Fe3+2(Si6O18)2
Colour:
Honey-yellow
Lustre:
Vitreous
Hardness:
5 - 5½
Specific Gravity:
2.93
Crystal System:
Orthorhombic
Member of:
Name:
Named by A.P. Khomyakov, N.M. Chernitsova, S.M. Sandomirskaya, and G.L. Vasil’eva for Lake Imanda, Kola Peninsula, Russia, near the type locality. It is the largest lake on the peninsula at 812 km2.
Unique Identifiers
Mindat ID:
2017
Long-form identifier:
mindat:1:1:2017:2
GUID
(UUID V4):
(UUID V4):
00716c02-a4d4-42f8-a622-a265a6c25857
IMA Classification of Imandrite
Approved
IMA Formula:
Na12Ca3Fe3+2Si12O36
First published:
1979
Classification of Imandrite
9.CJ.15b
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
61.1.2b.1
61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
14.25.8
14 : Silicates not Containing Aluminum
25 : Silicates of Fe, Ca and alkalis and of Fe, Mg, Ca and alkalis
14 : Silicates not Containing Aluminum
25 : Silicates of Fe, Ca and alkalis and of Fe, Mg, Ca and alkalis
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Ima | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Imandrite
Vitreous
Transparency:
Translucent
Colour:
Honey-yellow
Hardness:
5 - 5½ on Mohs scale
Density:
2.93 g/cm3 (Measured) 2.92 g/cm3 (Calculated)
Optical Data of Imandrite
Type:
Biaxial (+)
RI values:
nα = 1.605 nβ = 1.608 nγ = 1.612
2V:
Measured: 75° , Calculated: 82°
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v
Chemistry of Imandrite
Mindat Formula:
Na12Ca3Fe3+2(Si6O18)2
Common Impurities:
Ti,Zr,Mn,Mg
Crystallography of Imandrite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 7.426(4) Å, b = 10.546(1) Å, c = 10.331(1) Å
Ratio:
a:b:c = 0.704 : 1 : 0.98
Unit Cell V:
809.07 ų (Calculated from Unit Cell)
Z:
1
Comment:
Space Group: Pmnn
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0012468 | Imandrite | Chernitsova N M, Pudovkina Z V, Voronkov A A, Ilyukhin V V, Pyatenko Y A (1980) Imandrite Na12Ca3Fe2[Si6O18]2 - a representative of a new branch in the lovozerite structural family Doklady Akademii Nauk SSSR 252 618-621 | 1980 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.73 Å | (50) |
3.33 Å | (60) |
2.63 Å | (100) |
1.853 Å | (70) |
1.520 Å | (50) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Imandrite
General Appearance of Type Material:
Anhedral grains, 1-3 mm
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity,5530; Mining Institute, St. Petersburg, 1298/1; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 80181; The Natural History Museum, London, England, 1994,10.
Geological Setting of Type Material:
Pegmatitic alkalic rocks
Associated Minerals at Type Locality:
Reference:
Khomyakov, A.P., Chernitsova, N.M., Sandomirskaya, S.M., Vasil’eva, G.L. (1979) Imandrite - a new mineral of lovozerite family. Mineralogiceskij Zhurnal: 1: 89-93.
Synonyms of Imandrite
Other Language Names for Imandrite
Relationship of Imandrite to other Species
Member of:
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
9.CJ. | Avdeevite | NaAl4(Be5Li)(Si6O18)2(H2O)1-2 |
9.CJ. | Nakkaalaaqite | K2[Na3Ca]LiCa2Ti2Be4Si12O38 |
9.CJ. | Zolotarevite | Na5Zr[Si6O15(OH)3] · 3H2O |
9.CJ. | Beryllocordierite-Na | NaMg4(Al5Be)(AlSi5O18)2 · 2H2O |
9.CJ. | Beryllosachanbińskiite-Na | NaMn4(Al5Be)(AlSi5O18)2 · 2H2O |
9.CJ.05 | Bazzite | Be3Sc2(Si6O18) |
9.CJ.05 | Beryl | Be3Al2(Si6O18) |
9.CJ.05 | Indialite | Mg2Al3(AlSi5O18) |
9.CJ.05 va | Vorobyevite | Be3Al2(Si6O18) |
9.CJ.05 | Stoppaniite | Be3Fe3+2(Si6O18) · H2O |
9.CJ.05 | Ferroindialite | (Fe2+,Mg)2Al4Si5O18 |
9.CJ.05 | Johnkoivulaite | Cs[Be2B]Mg2Si6O18 |
9.CJ.10 | Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
9.CJ.10 | Sekaninaite | (Fe,Mg)2Al3(AlSi5O18) |
9.CJ.15a | Combeite | Na4.5Ca3.5Si6O17.5(OH)0.5 |
9.CJ.15a | Kazakovite | Na6Mn2+Ti(Si6O18) |
9.CJ.15c | Koashvite | Na6(Ca,Mn)(Ti,Fe)Si6O18 · H2O |
9.CJ.15a | Lovozerite | Na2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O |
9.CJ.15a | Tisinalite | Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O |
9.CJ.15a | Zirsinalite | Na6(Ca,Mn2+,Fe2+)Zr(Si6O18) |
9.CJ.15a | Litvinskite | Na2(◻,Na,Mn)ZrSi6O12(OH,O)6 |
9.CJ.15a | Kapustinite | Na6ZrSi6O16(OH)2 |
9.CJ.15a | Townendite | Na8ZrSi6O18 |
9.CJ.25 | Baratovite | KCa7(Ti,Zr)2Li3Si12O36F2 |
9.CJ.25 | Katayamalite | KLi3Ca7Ti2(SiO3)12(OH)2 |
9.CJ.25 | Aleksandrovite | KCa7Sn2Li3Si12O36F2 |
9.CJ.30 | Dioptase | CuSiO3 · H2O |
9.CJ.35 | Kostylevite | K2Zr(Si3O9) · H2O |
9.CJ.40 | Petarasite | Na5Zr2(Si6O18)(Cl,OH) · 2H2O |
9.CJ.45 | Gerenite-(Y) | (Ca,Na)2(Y,REE)3Si6O18 · 2H2O |
9.CJ.50 | Odintsovite | K2Na4Ca3Ti2Be4Si12O38 |
9.CJ.55 | Mathewrogersite | Pb7FeAl3GeSi12O36(OH,H2O)6 |
9.CJ.60 | Pezzottaite | Cs(Be2Li)Al2(Si6O18) |
Other Information
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 Imandrite
mindat.org URL:
https://www.mindat.org/min-2017.html
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References for Imandrite
Localities for Imandrite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
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Vuonnemiok River Valley, Khibiny Massif, Murmansk Oblast, Russia