Physical properties of quartzite

(1) Brittle.

(2) Thermoelectric.

(3) Refractive index is 1.533 to 1.541, birefringence difference is 0.009, dispersion is 0.013.

(4) Quartz has a strong piezoelectric property, that is, sparks will be generated when the friction is struck hard. This is also the method of flint fire.

(5) Common inclusions in quartz are: Hair crystal-mainly rutile. Grass crystal-mainly tourmaline; bile crystal-liquid inclusions in quartz; cyanite-containing light blue rutile needles; milky quartz-turbidity caused by fine water holes; green quartz-from plate shape Or fragmented chlorite, sometimes may be green needle-like apatite; aventurine-quartzite contains green or red-brown mica flakes, also known as Yao quartz, commonly known as Dongling stone. Common smoke black to dark brown smoke crystals, mainly because these rocks contain a large amount of radioactive uranium and thorium elements.