the number of reacting molecules, atoms, or ions in a single-step chemical reaction. For example, a unimolecular reaction may involve radioactive decay of a single atom, or one molecule producing other molecules. A bimolecular reaction involves the collision and reaction between two molecules, atoms or ions to form other products. Cf., Transition State Theory

The number of reacting molecules, atoms, or ions in a single-step chemical reaction. For example, a unimolecular reaction may involve radioactive decay of a single atom, or one molecule producing other molecules. A bimolecular reaction involves the collision and reaction between two molecules, atoms or ions to form other products.
Cf., Transition State Theory

See c/f-related distribution.

See crystal system.

See monolayer, phyllosilicate.

Between 2:1 layers of a phyllosilicate, a monolayer involves an arrangement within the interlayer of one single plane of H₂O molecules around interlayer cations (= hydration shell). Although the plane is only approximate, the spacing seems to suggest a planar feature. Because the H₂O molecules are in planar coordination around the cation, the spacing appears as an H₂O plane or “layer”.
Cf., bilayer; bilayer, phyllosilicate

See binuclear complex.

See b-fabric.

An obsolete term for ferrian annite.

A trioctahedral member of the true mica group. The ideal formula is KFe²⁺_1.5Mn²⁺_0.5Mg_0.5 v_0.5Si₄O₁₀F₂ ( where v = vacancy) and this formula does not represent an end-member species. A typical range in composition is: Fe²⁺ > Mn²⁺ + Mg (Rieder et al., 1998). Robert and Maury (1979) originally described montdorite-1M from a peralkaline rhyolite of the Mont-Dore massif, France, in space group C2/m.