| http://www.w3.org/ns/prov#value | - and mixtures thereof, a is the mole ratio of M1 to (Al + E) and varies from 0.15 to 5.0, E is an element selected from the group consisting of gallium, iron, boron, chromium, indium and mixtures thereof, x is the mole fraction of E and varies from 0 to 0.5, n is the weighted average valence of M1 and has a value of +1 to +3, y' is the mole ratio of Si to (Al + E) and is greater than 5 and z is th
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