| Ikranite | |
|---|---|
 Brown- yellow ikranite and aegirine fibers (field of view: c. 13 × 11 mm) | |
| General | |
| Category | Cyclosilicate Eudialyte group |
| Formula (repeating unit) | (Na,H3O)15(Ca,Mn,REE)6Fe3+2Zr3([ ],Zr)([ ],Si)Si24O66(O,OH)6Cl2−3H2O |
| IMA symbol | Ikr[1] |
| Strunz classification | 9.CO.10 |
| Dana classification | 64.1.1.08 |
| Crystal system | Trigonal |
| Crystal class | Ditrigonal pyramidal (3m) H-M symbol: (3m) |
| Space group | R3m |
| Unit cell | a = 14.167, c = 30.081 [Å]; Z = 3 |
| Identification | |
| Color | Yellow to brownish yellow |
| Crystal habit | Pseudo-hexagonal |
| Cleavage | None |
| Fracture | Conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent |
| Density | 2.82 g/cm3 |
| Optical properties | Uniaxial; weak anomalous biaxiality |
| Other characteristics | Mildly  Radioactive |
| References | [2][3][4] |
Ikranite is a member of the eudialyte group, named after the Shubinov Institute of Crystallography of the Russian Academy of Sciences. It is a cyclosilicate mineral that shows trigonal symmetry with the space group R3m, and is often seen with a pseudo-hexagonal habit.[2] Ikranite appears as translucent and ranges in color from yellow to a brownish yellow. This mineral ranks a 5 on Mohs scale of mineral hardness, though it is considered brittle, exhibiting conchoidal fracture when broken.[3]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b Ikranite on Mindat.org
- ^ a b Ikranite on Webmineral
- ^ Cite error: The named reference
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