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Striving to achieve a continuous flow of delivery and quality of its products, Ardósia Nacional extracts, fabricates and distributes slate from its own quarries, guaranteeing its customers` satisfaction.

Ardósia Nacional has the largest Matacão mining operation in the world, capable of producing gray and petroleum Matacão slate for another one hundred years. This slate has the highest grade of hardness known to this date; 8.5 Moh’s scale, SGS Test.

Matacão is a special type of slate that will not cleave to less than 2 to 3 cm, which is ideal for billiard tables, landscaping, tables, counter tops, slabs, and risers due to its high level of hardness and resistance.