Quartz

Mineral Species: Oxides

Chemical Formula: SiO₂

Mohs Scale Hardness: 7

Location: Worldwide

Typical Appearance: Typically transparent prismatic cystals with terminations.

Types of Quartz:

 - Amethyst - Purple variety of Quartz.
 - Citrine - Yellow variety of Quartz.
 - Smoky Quartz - Brown variety of Quartz.
 - Rose Quartz - Pink variety of Quartz.
 - Milky Quartz - Opaque white variety of Quartz.
 - Crackle Quartz - Heated and dyed Quartz.
 - Cherry Quartz - Manufactured red coloured Quartz.
 - Rutilated Quartz - Quartz with hair like inclusions of Rutile.
 - Tourmalinated Quartz - Quartz with Black Tourmaline within it.