ikranite

{{Infobox mineral | name = Ikranite | boxbgcolor = orange | image = Ikranite, Aegirine-136174.jpg | caption = Brown- yellow ikranite and aegirine fibers (field of view: c. 13 × 11 mm) | category = Cyclosilicate Eudialyte group | formula = {{chem2|(Na,H3O)15(Ca,Mn,REE)6Fe2(3+)Zr3([ ],Zr)([ ],Si)Si24O66(O,OH)6Cl_{2–3}H2O}} | IMAsymbol = Ikr | strunz = 9.CO.10 | dana = 64.1.1.08 | system = Trigonal | class = Ditrigonal pyramidal (3m) H-M symbol: (3m) | symmetry = R3m | unit cell = a = 14.167, c = 30.081 [Å]; Z = 3 | color = Yellow to brownish yellow | habit = Pseudo-hexagonal | cleavage = None | fracture = Conchoidal | tenacity = Brittle | mohs = 5 | luster = Vitreous | streak = White | diaphaneity = Transparent | density = 2.82 g/cm3 | opticalprop = Uniaxial; weak anomalous biaxiality | other = Mildly 25px Radioactive | references = }}

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. 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.