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Grafit: Mineral dengan ciri ciri melampau dan banyak kegunaan

Grafit: Mineral dengan ciri ciri melampau dan banyak kegunaan

Tuff, a relatively soft, porous rock that is usually formed by the compaction and cementation of volcanic ash or dust. The Italian term tufa is sometimes restricted to the soft, porous, sedimentary rock formed by the chemical deposition of , or calcium carbonate, or silica from water as

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