Our RQT line of quartz tile flooring manufactured with 70% natural quartz minerals, which make it a very hard, durable and dimensionally stable tile that will not break or tear like other quartz floor tiles. On the MOH’s scale of hardness, Diamonds are the hardest mineral at 10. Quartz measures a 7 on the MOH’s scale. The primary contents for VCT and LVT, Calcium Carbonate or Limestone, measure a 3. On the MOHs scale. Clearly, Quartz is the toughest resilient flooring material.