Formula: Al3(UO2)4(PO4)4(OH)5.5H2O
Origin of name: for triangular habit
Crystal system: Triclinic
Crystal class: 1 or 1
Twinning: Common, about [011]
Unit cell: a = 10.39, b = 10.56, c = 10.6, α = 116.4°, β = 107.8°, γ = 113.4°
Colour: Yellow, bright yellow, yellow-green
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals flat, triangular or rhombohedral, twinned, to 0.2 mm, in aggregates
Hardness: 2-3
Specific gravity: 3.7
Cleavage: Perfect
Tenacity:
Streak: Light yellow
Synonyms/varieties:
Comments: Radioactive
| 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 |