Physical properties of quartz slabs:
(1) Quartz slabs are brittle.
(2) Quartz slabs are thermoelectric.
(3) Quartz slabs have a refractive index of 1.533 ~ 1.541, a birefringence difference of 0.009, and a dispersion of 0.013.
(4) Quartz slabs have strong piezoelectricity (Piezoelectric property), that is, sparks will be generated when the friction is struck hard, which is the method of making fire with flint.
(5) Common inclusions in quartz slabs are: Hair crystal-mainly rutile. Grass crystal-mainly tourmaline; water bladder crystal-liquid inclusions in quartz slabs; blue quartz slabs-light blue rutile needles inside; milk quartz slabs-turbidity caused by fine water holes; green quartz slabs －Composed of plate-like or fragmented chlorite, sometimes it may be green needle-like actinolite; aventurine (Aventurine)-quartz slabs contains green or reddish-brown mica flakes, also known as Yao quartz slabs, Commonly known as Tanglin Stone. Common smoky black to dark brown smoky crystals are mainly due to the fact that these rocks contain more radioactive uranium and thorium elements.
