Formula: (Na,Ca)7(Si,Al)12O24(SO4,CO3,OH,Cl)3 . H2O
Origin of name: For M. Franzini, Italian mineralogist
Crystal system: Hexagonal
Crystal class: 32 or 3m or -3 2/m
Twinning:
Unit cell:
Colour: Pearly white
Diaphaneity: Transparent to opaque
Luster: Pearly
Habit: Crystals stubby prismatic
Hardness: 5
Specific gravity: 2.49
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
| Back to Alphabetical list | Colour photos | Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |