Formula: (Mn,Ca,Zn)5(AsO4)2[AsO3(OH)]2.4H2O
Origin of name: for Villy Aellen, director of the Natural History Museum of Geneva, Switzerland.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 18.55, b = 9.52, c = 10.01, β = 97°
Colour: Colourless to bright pink, orange-pink
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals prismatic, tabular and elongated to 0.3 mm, in rosette-like aggregates to 5 mm, to 4 cm at Ojuela mine
Hardness: about 4
Specific gravity: 3.20 to 3.69
Cleavage: 1; {100} good
Tenacity:
Streak: White
Synonyms/varieties:
Comments: series with sainfeldite
| Back to Alphabetical list | Colour photos | Optical properties/Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |