natural rough crystal quartz 1) 93% quartz and 7% resin 2) Incredibly hardness natural rough crystal quartz tile 2.Size:10-30mm 3 ... agate, Indian agate, turquoise, semi-precious stone, rose quartz, amethyst, quartz, green aventurine, tiger's eye, picture jasper, green ... piebald stone, gold sand stone, red quartz, spotted stone, purple fluorite, white turquoise and alabaster, etc ...