An obsolete term for muscovite.

An obsolete term for muscovite.

An obsolete term for chromian phengite and chromian muscovite.

An unconsolidated, soft sediment primarily composed of calcium carbonate, lime, and/or clay; impurities are common. Marl is formed in marine and lake deposits as a mud. Marl is used as a fertilizer to enhance calcium content and as a component of Portland cement.

An obsolete varietal term for a thinly foliated form of green-white serpentine.

An obsolete term for Mn-bearing glauconite from the Urals.

An obsolete term for glauconite.

A trioctahedral member of the true mica group. The end-member formula is KLiAlMn²⁺AlSi₃O₁₀F₂. Typical ranges in composition are: Mn²⁺ = 1.0 – 0.5, Li = 1.0 – 1.5, Si = 3.0 – 3.5, ^ivAl = 1.0 – 0.5 (Rieder et al., 1998). Masutomilite occurs as a 1M polytype with octahedral ordering, which reduces the ideal space group of C2/m to the acentric subgroup of C2. Masutomilite occurs in granitic pegmatites rich in Li.
Cf., zinnwaldite

A discredited term describing a randomly interstratified Ni-bearing lizardite and clinochlore.

See pyrosmalite.