Formula: Ca2B5O9Cl . H2O
Origin of name: For E. Hilgard, German-American geologist
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit:
Hardness: 5
Specific gravity: 2.71
Cleavage: 2; {100} and {010} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Data are for hilgardite-1A; there are also -3A and -4M polytypes
| 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 |