Formula: Al(SO4)(OH) . 5H2O
Origin of name: For Joseph Urban, American collector
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster:
Habit: Crystals prismatic, imperfect
Hardness: 2.5
Specific gravity: 1.79
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with rostite
| 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 |