Formula: Ca5H2(AsO4)4 . 9H2O
Origin of name: For Henri Guerin, French chemist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 17.63 Ǻ, b = 6.73 Ǻ, c = 23.47 Ǻ, β = 90.6°
Colour: Colourless; white in aggregates
Diaphaneity:
Luster: Vitreous to pearly
Habit: Crystals acicular to wedge-shaped, in spherulites and rosettes
Hardness: 1.5
Specific gravity: 2.68
Cleavage: 4; One perfect parallel to plane of plates, three others
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with ferrarisite
| 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 |