Here is Black Color Quartz Stone Manufacturer talking about Quartz Stone  Characteristics. 

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1. Brittle

2. It has thermoelectricity

3. Refractive index 1.533 - 1.541, birefringence difference 0.009, dispersion 0.013

4. Quartz has a powerful piezoelectric property (Piezoelectric land ), in other words, a spark is created when the friction is struck by pressure, that's the way of taking away the meteorite.

5. Frequent inclusions in quartz are: Hair - chiefly rutile; bud crystal - mostly tourmaline; water crystal - walnut liquid addition; blue walnut - interior Includes mild blue rutile needles; milk quartz - turbidity brought on by fine water pockets; green quartz - consisting of slab-like or muddy chlorite, occasionally green needle-like actinolite; (Aventurine) - Quartzite includes green or reddish-brown mica flakes, also referred to as beam quartz, popularly called Dongling Stone.

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