Rock around the Clock
Chemical Formula-SiO2, Mineral Group-Silicate,Hardness-7, Specific Gravity-2.65gm/cc
Transparent-Yes Colors-many colors, Streak- White,golden yellow,brown,green purple, and colorless,Luster-Vitreous,Cleavage- indiscernible,Fracture-Conchoidal
There are many colors of Quartz here is one of the most common.
It is transparent which is why it is used for watches, clocks, and optical glasses.
Cleavage or Fracture
Quartz Is not in the cleavage it is a fracture mineral. The Fracture is a conchoidal which means it breaks in an irregular manner.
Where It Is Found
Quartz is the second most common mineral found in the Earth's crust. It is commonly found in all environments major producers of quartz are the United States particularity Arkansas, and Brazil.
There are two entirely different major uses for quartz crystal. One of these is as a gemstone. The varieties known as rock crystal, amethyst, smoky quartz, rose quartz, and citrine are in demand as low-priced but attractive gemstone or display specimens. For gem applications, the quartz is usually cut and faceted for jewelry, or is carved into various shapes by hand or by laser.