Pseudomorphs and ghost structures of some aluminous silicate minerals in pelitic hornfelses of the Timeball Hill Formation, Transvaal Supergroup, in the northeaster Transvaal, South Africa
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Pseudomorphs and ghost structures of some aluminous silicate minerals in pelitic hornfelses of the Timeball Hill Formation, Transvaal Supergroup, in the northeaster Transvaal, South Africa