Formula: Na(Ca,Mn)Al(PO4)(F,OH)3
Origin of name: from source Viitaniemi pegmatite, Erajarvi, Orivesi, Finland
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: polysynthetic, on {100} twin and composition plane, common
Unit cell: a = 6.832, b = 7.143, c = 5.447, β = 109.367°
Colour: gray to white
Diaphaneity: Transparent, translucent if clouded by inclusions
Luster: Vitreous
Habit: Crystals flattened and elongated, may be fan-shaped, to 18 cm; inclusions in other minerals
Hardness: 5
Specific gravity: 3.25
Cleavage: 2; {10-1} good, {100} probably parting
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
| 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 |