Describes a property of material where there is attraction by a magnet.
Cf., diamagnetism, paramagnetism

A poorly defined material, possibly Al-rich biotite.

A boron-rich serpentine (Ranorosoa et al., 1989), often confused with a boron-rich chlorite in older literature. Manandonite has an ideal chemical composition of Li₂Al₄(Si₂AlB)O₁₀(OH)₈ and occurs in the 2H₂ polytype. Manandonite occurs in the Antandrokomby pegmatite, Manadona River, near Antsirabe, Madagascar.
Cf., borocookeite, boromuscovite

See hydrotalcite group.

See cutan.

An obsolete term for manganoan muscovite.

See pyrosmalite.

An obsolete varietal term for biotite.

An obsolete term for manganoan muscovite.

An obsolete varietal term for glauconite.