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Heterophyllosilicates are titanosilicate minerals based on layers which, via a periodic substitution of rows of Si-tetrahedra by rows of Ti-polyhedra, can be formally derived from the tetrahedral–octahedral–tetrahedral (TOT) layer of phyllosilicates. According to the periodicity of the substitution, three types of HOH layers (H to indicate the hetero substitution) are known: bafertisite-, astrophyllite-...
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