Formula: Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10 . 2H2O
Origin of name: For A. Harker, British petrologist
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity:
Luster: Vitreous
Habit: Crystals octahedral
Hardness:
Specific gravity: 2.96
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 |