Formula: (Mn,Fe,Mg,Ca)2(PO4)(F,OH)
Origin of name: from Greek for threefold
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: reddish brown to dark brown, salmon pink, alters to brownish black to black
Diaphaneity: translucent
Luster: vitreous to resinous
Habit: crystals poorly developed, rough, massive
Hardness: 5 to 5.5
Specific gravity: 3.55 to 3.87
Cleavage: 3; {001} good, {010} fair, {100} poor
Tenacity:
Streak: brown to white
Synonyms/varieties:
Comments: series with zwieselite
| 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 |