On the use of matrix‐like arrays as chemical symbols

The isomorphous replacement of two elements simultaneously by two others is symbolized by a square matrix. Again three such matrices, representing the cyclic replacement of two elements out of three by two others, may be contracted into one matrix of three columns and two rows. In all these the coordinative binding of aluminium is indicated by its place. These symbols may be combined with one another, or with existing symbols concerning the isomorphous replacement of one element by one other. Thus a clear survey of silicate chemistry is obtained. By placing appropriate coefficients above the columns of the matrix, a particular mixed crystal may be represented. On the strength of this, an opinion is advanced as to the most probable composition of sarcolite.