Formula: MnMn2(PO4)2(OH)2 . 4H2O
Origin of name: For Harry Berman, American mineralogist
Crystal system: Monoclinic
Crystal class: 2
Twinning: Common on {101}
Unit cell: a = 5.43 Ǻ, b = 19.21 Ǻ, c = 5.43 Ǻ, β = 110.4°
Colour: Pale red to dark reddish-brown
Diaphaneity:
Luster: Vitreous to resinous
Habit: Crystals tabular, micro; in fan-shaped or rosette-like aggregates
Hardness: 3.5
Specific gravity: 2.84
Cleavage: 1; {001} perfect, {110} imperfect
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
| 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 |