Formula: (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl·nH2O
Origin of name: For the IKRAN institute (Institut Kristallografii Rossiyskoy Akademii Nauk)
Crystal system: Trigonal
Crystal class: 3m
Twinning:
Unit cell: a = 14.167, c = 30.081
Colour: Yellow, brownish yellow to light brown
Diaphaneity: Translucent to transparent
Luster: Vitreous
Habit:
Hardness: 5
Specific gravity: 2.82
Cleavage: None observed
Tenacity: Brittle, conchoidal fracture
Streak: White
Synonyms/varieties:
Comments:
| Back to Alphabetical list | Colour photos | Optical properties/Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |